HomeMy WebLinkAboutRes 1995 - 2020 Hazard Mitigation PlanCity of Tukwila
Washington
Resolution No. 111
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF TUKWILA,
WASHINGTON, ADOPTING THE TUKWILA HAZARD MITIGATION PLAN.
WHEREAS, the City of Tukwila and surrounding areas are subject to various hazards,
including flooding, earthquakes, landslides, severe windstorms and other natural and
technological/man-made hazards; and
WHEREAS, the City of Tukwila is committed to strengthening the City's resilience to the
effects of natural and technological/man-made hazards; and
WHEREAS, the Federal Disaster Mitigation Act of 2000, specifically Section 322, addresses
local mitigation planning and requires local governments to develop Local Hazard Mitigation Plans
as a condition of receiving Hazard Mitigation Grant Program funding, Flood Management
Assistance, and Pre -Disaster Mitigation funding from the Federal Emergency Management
Agency (FEMA); and
WHEREAS, FEMA has completed a pre -adoption review of the City's Hazard Mitigation Plan
and will approve the Plan upon receiving documentation of its adoption by the City;
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON,
HEREBY RESOLVES AS FOLLOWS:
The City Council approves participation in the hazard mitigation planning process,
development of a City-wide Hazard Mitigation Plan and adoption of the proposed Hazard
Mitigation Plan subject to FEMA approval, hereby incorporated by reference as "Attachment A."
PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a
Regular Meeting thereof this 7jo day of 2020.
ATTEST/AUTHENTICATED:
Christy O'Flaherty, MMC, City Clerk
APPROVED AS TO FORM BY:
Office of the City Attorney
De'Sean Quinn, Council President
Filed with the City Clerk: - i 5-7W
Passed by the City Council:
Resolution Number: (995-
Attachment A: Tukwila Hazard Mitigation Plan ("City of Tukwila Plan Annex")
W:1Word Pro ces sing\Resol di ons\Hazard Mitigation Plan 7-7-20
JW:bjs Review and analysis by Barbara Saxton Page 1 of 1
W King County
City of Tukwila Plan Annex
Introduction
Tukwila lies in the heart of the Puget Sound region, sitting 12 miles
to the south of downtown Seattle, 17 miles to the north of
downtown Tacoma just east of Seattle -Tacoma International
Airport, and at the crossroads of two major interstate highways, I-5
and I-405. The City of Kent is our southern border, with SeaTac
to our west and Renton on our east. The Green/Duwamish River
runs the full length of the city from north to south. The BNSF
Rails dissect the City from north to south. Tukwila is home to the
state's largest shopping mall, Westfield/Southcenter Mall. Tukwila
is a local leader in retail and commercial sales, warehousing and
distribution of goods and manufacturing. The current population
of the City is 20,930. There is a large development on recently
annexed land in the south end of the City that could increase the
population substantially with the next 5 years.
Governing Body Format- The City of Tukwila has a Mayor -
Council form of Government. Tukwila's Mayor is the chief
executive officer of the City, and the Council is the legislative
branch and governing body. The City's management consists of
eight department heads, 347 full time employees with 100 part-time
employees. The current operating budget of the City is $65.9
million.
Jurisdiction Point of Contact:
Name: Jay Wittwer
Title: Emergency Manager Director
Entity: Tukwila Fire Department
Phone: 206-971-8710
Email: Jay.Wittwer@TukwilaWA.gov
Plan Prepared By:
Name: Jason Konieczka
Title: Emergency Manager
Entity: Tukwila Fire Department
Phone: 206-971-8740
Email:
Jason.Konieczka@TukwilaWA.gov
Development Trends
City of Tukwila Profile
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Incorporated: 1908
Population: 20,294 (2018 est.)
Location: 47°28'42"N and
122016'32"W
Located in King County
Area: 9.60 sq miles
Mayor: Allan Ekberg
Website: www.tukwilawa.gov
Since 1990, the City of Tukwila's annual average population growth
(with annexations removed) was about 0.9%. Per the City's Strategic
Plan, development and growth assumptions yield an estimated average
annual growth rate of about 1.1% for the 20-year period from 2012-
2031. In 2010, Tukwila businesses had nearly 43,130 employees.
Estimated employment growth over the next 20 years is also estimated
to average about 1.0% per year.
Tukwila's current nighttime population is 20,930. It is projected to
grow to 25,635 by 2030. The City's estimates place Tukwila's daytime
population between 150,000 and 170,000, including approximately 16
million shoppers a year to the Westfield Southcenter Mall alone. This
population is 7 to 8 times the size of the City's residential population.
For the purposes of hazards mitigation there are five key city sub -areas:
Tukwila's Southcenter area, Manufacturing/Industrial Center, Tukwila
City of Tukwila Hazard Mitigation Plan
Page 1
ing County
International Boulevard corridor, Tukwila South and the remaining residential/commercial areas.
Tukwila's Southcenter area is intended to develop as a high -density, regionally oriented, mixed use center.
It serves major employment, shopping and entertainment destination, with an expanding residential population in
an increasingly urban and walkable format. It is anticipated that residential growth in this area will increase to 2,700
units by 2031. There is a total of 672 dwelling units constructed, under construction, or in the permitting stage in
this area. Approximately 80% of the units under construction will be occupied by people with disabilities and/or
seniors. In 2031, a total of 2,700 housing units are forecasted to be in this area. The trend is to grow vertically with
a 19-story combination residential and commercial recently completed; and several other five to six story
residential buildings under construction.
The Tukwila South Project will encompass about 400 acres of land along the Green River at the south end of the
City. The project is likely to add about 10 million square feet of occupied space, including a mix of office space,
residential, retail, and hotel. The development timeline for Tukwila South is currently uncertain due to many
factors, including length of time to complete infrastructure improvements and other market factors.
Tukwila's Manufacturing/Industrial Center comprises an area of 998 acres along the Duwamish River, bounded
generally by the City of Seattle on the north, South 125th Street on the south, the BNSF Burlington Northern railway
right -of way on the east, and the Duwamish River on the west. The employment exceeds 18,000 in this area, and
more than three-quarters of this is in manufacturing. More recently three large warehouses are at the permitting
stage, which could add significant employment and warehouse space in this corridor.
Tukwila International Corridor is also transitioning to a more urban area with mid -rise multi -story development
(Tukwila Village). With the location of Light Rail Station and more recent capital investments by the City along
this corridor additional development is anticipated in this area. More intensive development could occur south of
the light rail station.
There is not going to be significant single-family development due to limited land and regulations. In a good
economic year, the city issues 20 new single-family dwelling permits. There were however two very large
residential projects recently completed near the Mall, with about 400 units of both an apartment building and
senior housing.
The development of Tukwila South will decrease the risk of hazards, particularly from floods. The developer was
able to regrade and excavate the entire hillside to the southwest of the central business district and in doing so was
able to relocate all of the dirt to raise the 400 acres for a future development up a significant level. Also, Tukwila
Village is located outside of the flood zone or liquefaction zones.
City of Tukwila Risk Summary
Hazard Risk and Vulnerability Summary
HAZARD HAZARD SUMMARY VULNERABILITY SUMMARY IMPACT SUMMARY
Avalanche Tukwila does not
within any avalanche
zones.
Earthquake RrEarthquakes are
probably the biggest
threat to the City of
Tukwila. We are located
in a region that is
susceptible to all three
types of earthquakes:
crustal, intraplate or
Many of the buildings in Tukwila
are not up to the current
earthquake standards. The valley
floor has many concrete tilt -ups,
many of them constructed prior
to the stricter codes that were
introduced in the 1997 Uniform
Building Code. Also, some of
A large earthquake in
our City would be
devastating. Many of
the City's critical
infrastructures would
be damaged, so it
would be difficult to
provide essential
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deep, and subduction
the bridges in Tukwila are in
services or assist with
zone quakes. The larger
need of retrofit to meet the
the response effort. If
more devastating quakes
current standard.
an event occurred
occur every 750 years
within the region, we
and we are overdue by
would not be receiving
450 years.
mutual aid from our
neighbors, as they
would be dealing with
their own responses.
Flood
The City is bisected by
There are 28 residential and 21
With the potential of
the Green and
commercial properties including
flooding, there is a plan
Duwamish River which
a professional rugby and soccer
to reinforce the levees
runs the entire City from
complex and a golf course that
throughout the City to
the north and south
may be affected based on King
lessen the impact.
boundaries.
County's 100-year flood map
see fi res 1 and 2).
Landslide
Landslides typically
There is one area prone to
A landslide in this area
occur where the earth is
landslides in the City of Tukwila
could, under extreme
unstable, and the slope
located near a major arterial
conditions, cause life
is excessive. There is
road. The area has seen slides in
safety issues but will
usually an event that
the past and there has been
most likely only cause
triggers the landslide
attempts to stabilize the hillside.
traffic issues as well
such as excessive rains
The location is just above
property damage to
or an earthquake.
Interurban Ave South at
residences above the
approximately the 15200 block.
slide area.
Canyon Estates Condominiums
sit above the potential slide are.
Jersey barriers are located at the
lot
bottom to contain debris if a
slide occurred
Severe
We have seen some
As a result of the windstorms,
With widespread
Weather
strong windstorms blow
we see many trees down which
power outages, people
through our area within
can result in power outages
will not be able to call
the last few years.
throughout the region. This can
for emergency services
have a negative effect on both
or be able to heat their
communication and electricity,
homes. There may
which will impact people's ability
also be access issues
to heat their homes.
for emergency vehicles
with downed trees.
Severe Winter We have had some
With the challenging
A large snow event like
Weather significant snow events
topographical profiles, our area
the one in 2019 can
in the last few years in
is affected much more than a
make it difficult to
our typically mild region.
place that sees more snowfall.
travel throughout the
We also have many of our staff
region, making it
that live far from the City which
difficult for people to
makes it a challenge to report to
get their basic needs
work.
met.
Tsunami
With a potential tsunami
The same low-lying properties
The threat may not be
generated in the Puget
identified in the flood plan
as expected and catch
Sound, the City may
would be vulnerable to a
people off guard.
experience a similar
tsunami generated flood.
flood risk, depending on
City of Tukwila Hazard Mitigation Plan Page 3
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the tide, from the
Duwamish and Green
River than a weather -
flood.
Volcano
Tukwila is positioned
The entire region could be
A large amount of ash
close enough to Mount
affected by ash if the weather
can pose a health risk
Rainer to feel the impact
was right.
to both humans and
of a major eruption. We
livestock. It will also
are also close enough to
influence agriculture,
a few other volcanos to
transportation and the
feel the impact,
entire infrastructure.
IL
especially if ash was
dispersed in our
direction.
Wildfire
Tukwila is bordered by
N/A
N/A
only urban areas. There
are a few green belts
located in and around
the City, but nothing
large enough to sustain a
wildfire.
Civil 7We have seen a trend of
There is a risk to anybody
We have seen some
Disturbance civil disturbances in our
involved with the disturbance,
disturbances in
region that date back to
responding public safety
Tukwila as we are
the WTO protests,
personnel, and bystanders. There
located in the middle
which fell on Mayday of
can also be damage to property
of an urban sprawl and
1999. We have also seen
or the environment.
therefore can be a
disturbances attached to
gathering place for
large events such as
events that attract
concerts or even
AW
disturbances.
gatherings at the Mall.
Cyber Attack
There are more and
A successful attack on the City's
I am not aware of any
more attacks on
network system could potentially
attacks on the City at
government agencies
shut down the City's ability to
the time of this report.
network systems to hold
function. This would have a
that agency for ransom.
crippling effect on services
provided by the City including
police and fire responses.
Dam Failure The green river, which
The same residents and
The Army Core of
runs through Tukwila
businesses that would be
Engineers re -
and into the Duwamish,
affected by a tsunami or a
engineered and
is downstream of the
weather -related flood would also
fortified the Howard
Howard Hansen Dam,
be impacted by the dam failure.
Hansen Dam and the
which in 2008 was at
adjacent abutment
risk of failure.
back in 2009.
Hazardous
Burlington Northern
We would see a large impact if
We rely on hazmat
Materials
runs right through our
there were a derailment of
technicians that
Incident
City and currently all the
Bakken Oil cars since they are
respond in the region.
Bakken Oil train cars
highly volatile. We could also
We are part of the
traveling to the
see just about any type of
Zone 3 response which
refineries run on it. We
hazardous material traveling
dispatches the
are also at the
over -the -road with Tukwila
necessary technicians
City of Tukwila Hazard Mitigation Plan Page 4
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intersection of two
being located in the middle of
major freeways which
two major ports.
carry a large amount of
hazardous materials
over -the -road.
Public Health
Although we do not
We have seen some potential
Emergency
have any hospitals
threats over the years including
located in Tukwila, we
Ebola which didn't bring any
are surrounded by
several as well as a major
cases to King County. There
was a recent measles outbreak
international airport.
Any one of these
facilities may become
ground zero for some
type of disease
outbreaks.
Structure Fire Structure fires can be
devastating to the
environment, destroy
property and even
threaten lives. The
standards of fire
protection have gone up
over the years making
structure fires less likely
to occur.
Terrorism Ever since 9/11, there
has been a potential
terrorist threat.
that brought some cases here.
and equipment needed
to handle all types of
hazmat calls.
If we were to have any
type of disease
outbreak, resources
could be quickly
overwhelmed and there
may be a public panic
that would tax our
resources even further.
We have our share of older
We could see a
structures that were constructed
structure fire that could
prior to modern fire protection
be very damaging to
such as sprinklers or fire alarms.
the City's revenue
Tukwila is in the middle of the
greater urban Seattle/Tacoma
area with the major airport that
serves the area located just
outside of the City. This makes
the City as a potential threat.
stream, such as a fire at
the major shopping
mall. If the fire was to
be in significant size, it
would impact a lot of
iobs and commerce.
e saw a large surge of
equipment just to
mitigate terrorist
threats provided to our
hazmat teams to help
with the response to
potential terrorist
threats followinLy 9 / 11.
City of Tukwila Hazard Mitigation Plan Page 5
'9 King County
Hazard and Asset Overview Map
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Hazard Areas: r a
Ifth
King County
Mks
Figure 1: The map produced by King County which adds liquefaction Zones which .chow much of the Central Business District (CBT) in Tukwila is in a high potential
Zone.
City of Tukwila Hazard Mitigation Plan Page 6
Figure 2. This map shows the planned levee work that was proposed by the City along the Green Riven Refer to the flood annex on page 16.
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ternational .�
Airport
Lake
Washington
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ikwila
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Figure 3: The 100 year flood is depicted here based on the FF11A model. There are also potential landslide and steep slope ha.Zard areas shown with one area just west of
the 1-51 405 interchange not updated since mitigation work was performed. The map also shows the current location of the 4 fire stations in Tukwila and the two new
locations that are underway with the completion dates shown.
City of Tukwila Hazard Mitigation Plan Page 7
L9 King County
City of
Tukwila
Bridges
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Fig
ure 4: this map shows vehicle and pedestrian bridges located in the GO of Tukwila.
City of Tukwila Hazard Mitigation Plan
Page 8
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Projected
Employment
Growth by
Traffic Analysis
Zone
010-20 0
Legend
+L. . j CIt l-units
Employment Growth
�0.50
51 - 200
201 - 450
451 - 1500
1501 and above
Figure 5: The projected employmentgrowth in the City of Tukwil
City of Tukwila Hazard Mitigation Plan Page 9
'9 King County
Tukwila Planning Team
ORGANIZAnON
CONTRIBUTTON
Jason Konieczka
Emergency Manager
Fire Department
Update Plan
Jay Wittwer 011F
Emergency Management
Fire Department
Oversees Plan
Director
Hari Ponnekanti
Deputy PW
Public Works
Provided key information
Director/City Engineer
on mitigation plans.
Minnie Dhaliwal
Planning Supervisor
Department of
Contributed
Community
developmental trends of
Development
the City.
Tanya Taylor
Admin Support Tech
Public Works
Provided study on the
City's facilities current
conditions.
Gail Labanara
Public Works Analyst
Public Works
Provides information on
current and future projects
relating to mitigation
projects.
Plan Update Timeline
Meeting with Derrick 4/22/2019
Went over expectations of the
Jason Konieczka
Hiebert
updated plan
Derrick Hiebert
Meeting with Seatac EM 7/3/2019
Covered specific questions
Will Lugo
and Derrick Hiebert
regarding the plan.
Jason Konieczka
Derrick Hiebert
HMP Workshop
7/25/2019
This workshop covered lots of
Put on by Derrick
aspects of the plan and gave
Hiebert, numerous
some good insight on making
attendees.
the plan successful.
Meeting with EM, PW
9/13/2019
Go over the City's current
IF
Jason Konieczka, Hari
and DCD
projects and the plans to
Ponnekanti and Minnie
mitigate them.
Dhaliwal
Public Outreach Events
Public Outreach #1 August 7, 2019 This event was advertised on
our Facebook Page, Instagram
and our Cities Website. We had
posters explaining mitigation
needs in our area and a chance
for the public to write down any
concerns.
Public Outreach #2 August 27, 2019 This was a joint event with the
City of Kent, Seatac, Maple
Valley, Covington and Tukwila.
The event was advertised
Our booth was set up at
a "See You in the Park"
City function at the
Community Center, so
there were plenty of
attendees expressing
varvine levels of interest.
There were about 10
citizens in attendance in
addition to the
representatives from all
City of Tukwila Hazard Mitigation Plan Page 10
County
through social media including the cities as well as
the City's website. Derrick Hiebert from
City of Tukwila Hazard Mitigation Plan Page 11
Tukwila Hazard Mitigation Program
Hazard mitigation strategies were developed through a two-step
process. Each jurisdiction met with an internal planning team to
identify a comprehensive range of mitigation strategies. These
strategies were then prioritized using a process established at the
county level and documented in the base plan.
Hazard mitigation strategies in Tukwila include working with
Public Works and the Department of Community Development to
identify current and future projects and develop mitigation
strategies accordingly.
The mitigation plan is referenced in the City's Comprehensive
Emergency Management Plan (CEMP) which is updated annually
The mitigation plan has not been integrated in the past.
Plan Monitoring, Implementation, and Future Updates
King County leads the mitigation plan monitoring and update
process and schedules the annual plan check -ins and bi-annual
mitigation strategy updates. Updates on mitigation projects are
solicited by the county for inclusion in the countywide annual
report. As part of participating in the 2020 update to the Regional
Hazard Mitigation Plan, every jurisdiction agrees to convene their
internal planning team at least annually to review their progress on
hazard mitigation strategies and to update the plan based on new
data or recent disasters.
As part of leading a countywide planning effort, King County
Emergency Management will send to planning partner any federal
notices of funding opportunity for the Hazard Mitigation
Assistance Grant Program. Proposals from partners will be
assessed according the prioritization process identified in this plan
and the county will, where possible, support those partners
submitting grant proposals. This will be a key strategy to
implement the plan.
The next plan update is expected to be due in April 2025. All
jurisdictions will submit letters of intent by 2023, at least two years
prior to plan expiration. The county will lead the next regional
planning effort, beginning at least 18 months before the expiration
of the 2020 plan.
Continued Public Participation
Plan Goals
1. Access to Affordable,
Healthy Food
2. Access to Health and
Human Services
3. Access to Parks and
Natural Resources
4. Access to Safe and
Efficient Transportation
5. Affordable, Safe,
Quality Housing
6. Community and Public
Safety
7. Early Childhood
Development
8. Economic
Development
9. Equitable Law and
Justice System
10. Equity in Government
Practices
11. Family Wage Jobs
and Job Training
12. Healthy Built and
Natural Environments
13. Quality Education
14. Strong, Vibrant
Neighborhood
King County and its partner cities already maintains substantial
public outreach capabilities, focusing on personal preparedness and education. Information on ongoing progress
in implementing the hazard mitigation plan will be integrated into public outreach efforts. This will provide King
County residents, already engaged in personal preparedness efforts, with context and the opportunity to provide
feedback on the county's progress and priorities in large-scale mitigation. In the vertical integration of risk -
City of Tukwila Hazard Mitigation Plan Page 12
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reduction activities from personal to local to state and federal, it is important that the public understand how its
activities support, and are supported by, larger -scale efforts.
The outreach and mitigation teams will also continue to work with media and other agency partners to publicize
mitigation success stories and help explain how vulnerabilities are being fixed. When possible, public tours of
mitigation projects will be organized to allow community members to see successful mitigation in action.
Hazard Mitigation Authorities, Responsibilities, and Capabilities
Plans
Comprehensive Plan
Comprehensive
Emergency
Management Plan
(CEMP)
Capital Improvement
Plan
Public Safety Plan
City of Tukwila,
Department of
Community
Development
Jack Pace, DCD Director
City of Tukwila, Jay Wittwer, Emergency
Emergency Management Manager Director
City of Tukwila, Public
Works
Administrative Services
Department
Programs, Policies, and Processes
Building Codes City of Tukwila,
Department of
Community
Development — Planning
Division
Henry Hash, Public
Works Director
Rachel Bianchi, w
Administrative Services
Director
Jerry Hight, Building
Official
The elements of the plan
address every aspect of
the community — social,
economic, and
environmental. Each
element consists of goals,
policies, and
The document that
describes the process for
preparedness, response,
recovery, and mitigation
activities for the City.
The Hazard Mitigation
Plan provides the risk
profiles in the CEMP.
Identifies and prioritizes
large-scale projects.
The plan that identifies
the City's facilities
directly tied to Public
Safety such as the
Regional Justice Center,
Fire Stations and City
The International
Building Codes
determine the required
design and construction
standards for
for both
City of Tukwila Hazard Mitigation Plan Page 13
Critical Areas City of Tukwila,
Ordinance Department of
Community
Development
Entities Responsible for Hazard Mitigation
Public Works I HenryHash
ommunity wl Jack Pacell
Office of the Mavor I David Cline
National Flood Insurance Program
Jack Pace, Department of
Community Director
UA
LV King County
buildings and
nonbuildinLy structures.
Provides regulations for
wetlands, watercourses
and steep slopes.
Public Works Director
Department of Community Development Director
National Flood Insurance Program Compliance
Administrator
What department is responsible for floodplain Public Works
management in your community?
Who is your community's floodplain Ryan Larson
administrator? (title/position) Senior Program Manager — Surface Water
What is the date of adoption of your flood 2004
damage prevention ordinance?
hen was the most recent Community April 2019
Assistance Visit or Community Assistance
Contact?
Does your community have any outstanding No
NFIP compliance violations that need to be
addressed? If so, please state what they are?
Do your flood hazard maps adequately address No known flooding outside of identified Special
the flood risk within your community? If so, Flood Hazards -
please state why. i
Does your floodplain management staff need any
assistance or training to support its floodplain
management program? If so, what type of
training/ assistance is needed?
Foes your community participate in the
Community Rating System (CRS)? If so, what is
your CRS Classification and are you seeing to
improve your rating? If not, is your community
interested in joining CRS?
How many Severe Repetitive Loss (SRL) and
Repetitive Loss (RL) properties are located in
1-day course in floodplain management should be
offered to floodplain managers and development
staff.
SRL: none
RL: none
City of Tukwila Hazard Mitigation Plan Page 14
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Has your community ever conducted an elevation No
or buy out of a flood -prone property? If so, what No
fund source did you use? If not, are you
interested in pursuing buyouts of flood prone
properties?
Hazard Mitigation Strategies
2015 Hazard Mitigation Strategy Status
Improve capabilities to
respond to emergencies.
Improve capabilities for
response.
Improve critical streets
and infrastructure
Construct a new
Emergency Operations
Center
Construct a new
maintenance and
operations center to
support critical functions
including fleet services,
facilities maintenance,
water, sewer, surface
water, streets and traffic
Update the existing
Boeing Access Road
bridges. There are 3 in
all, one over I-5, one
over BNSF tracks, and
the other over Airport
Wav
2020 Hazard Mitigation Strategies
High
High
High
Under Construction, to
be completed in 2021
Acquired properties, in
the process of designing
and upgrading to meet
the City's needs.
One of the three bridges
over BNSF tracks has
been retrofitted with
seismic upgrades.
Bridge Maintenance
AGENCY/POC
PW/ Hari Ponnekanti
TIMELINE
2-5 years
PRIORITY
Varies
Levee Improvements
PW/ Hari Ponnekand
10 years
Varies
Earthquake (Seismic
Stud )
EM/Jason Konieczka
2 years
High
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Bridge Maintenance
Lead Points of
Partner Points of Contact:
Hazards Mitigated /
Funding Sources and
Contact: Hari
Public Works Department
Goals Addressed:
Estimated Costs:
Ponnekanti
Make necessary
WSDOT and Bridge
improvements to all
Replacement
bridges in Tukwila
Advisory Committee
(cost unknow at this
time)
Strategy Vision/Objective
Ensure all 23 bridges in the City have a high enough sufficiency rating. There are16 traffic bearing and 7
pedestrian bridges in the City of Tukwila of which two are jointly owned with neighboring jurisdictions.
Mitigation Strategy
By utilizing the City Bridge Report, we can identify which bridges are in the most need of maintenance. Since
the report is conducted every two years, it will continue to identify and prioritize which bridges require the most
attention.
2-Year Objectives:
5-Year Objectives:
Long -Term Objectives:
Boeing Access Road Bridge over
Boeing Access Road Bridge over
(see below)
Airport Way
Interstate 5
Implementation Plan/Actions
Using the City Bridge Inspection Report, identify and prioritize the bridges that require the most immediate
work and compose a plan to complete the needed work. Based on the report, there are two bridges that fall
under Group I, recommended for major maintenance:
Boeing Access Road over Airport Way, Substructure Seismic Rehabilitation
Status -
This structure is currently funded by the BRA Cprogram. The project is anticpated to be designed in Tinter 2019 and constructed
in 2020
Allentown Bridge Replacement (42nd Ave). Deteriorating Structural Condition of the steel superstructure
Status -
Application is currently under review by the Tashington State Department of Transportation Local Programs and the Bridge
replacementAdvisory Committee (BRAG) program. Appplication results will likely be announced in Septemberl October 2019.
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Performance Measures
The bridges in the City will meet the standard.
Flooding
Lead Points of
Partner Points of Contact
Hazards
Funding Sources
Contact: Hari
Public Works Department
Mitigated / Goals
and Estimated
Ponnekanti
Addressed:
Costs:
Make necessary
improvements on
levees throughout
the City
Strategy Vision/Objective
Update and improve through new floodwalls and setback or raising of the existing earthen levees to protect
the City of Tukwila from flooding.
Mitigation Strategy:
By prioritizing Tukwila 205 Levee improvements in an upstream to downstream direction, the percent of land
protected steadily increases over time. If construction were to instead progress downstream to upstream, levee
failure could occur upstream of newly raised levees, and therefore flood the land area behind the improved
levee section. For alternative analysis, design, and construction prioritization, the Tukwila 205 Levee has been
divided into three main segments that correspond with the three Tukwila capital improvement projects
identified in the Green River SWIF, then with further subdivision of each of these segments into two or three
smaller subsegments. Prioritization is also informed by prior analyses of the existing Tukwila 205 Levee
system that evaluated Green River water surface elevations and levee overtopping risk, scour, and geotechnical
levee stability.
2-Year Objectives:
5-Year Objectives:
Long -Term
Objectives:
Upgrade the Segale-Gunter and Gaco-
Upgrade the Ratolo upper, middle and
Western upper and lower levees
lower levees and Christensen Road levee
Upgrade the 200th Street
levee, monitor and re -
asses all levees.
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Implementation Plan/Actions:
The City of Tukwila sent a letter to the King County Flood Control District (FCD) on May 1, 2019 and
requested that FCD include budgets to reconstruct the Tukwila 205 levees within the next ten (10) years based
on NHC report findings that the majority of the levee system in its current condition cannot be accredited to
provide 100-year flood protection.
The existing Tukwila 205 Levee must be updated and improved through new floodwalls and setback or raising
of the existing earthen levees to protect the City of Tukwila from flooding. The Green River System -Wide
Improvement Framework (SWIF) declared the level of protection standard as the 500-year flood event plus
three feet of freeboard. As important as the freeboard standard, the levees also must meet factors of safety for
geotechnical stability under a variety of conditions including flood induced scour, drawdown, and seismic
events.
The proposed priority sequence for construction of these flood protection improvements generally starts at
the upstream end of the Tukwila 205 Levee, near river mile 16.7, and then proceeds downstream to near river
mile 12.4 (see previous map). Upstream of the Tukwila 205 Levee, near South 200th Street, there are existing
levees that currently provide 100-year level of flood protection (this includes the Frager Lowest Levee between
the Tukwila 205 Levee and South 200th Street). The Tukwila 205 Levee will tie into these 200th Street levees,
which also need to be improved in order to provide 500-year event plus three feet of flood protection. These
are private levees, but function together as a system with the Tukwila 205 Levee.
Performance Measures
Have our levees meet the protection standard.
City of Tukwila Hazard Mitigation Plan Page 18
'a King County
Earthquake (Seismic Improvements)
Lead Points of
Partner Points of Contact (Title)
Hazards Mitigated /
Funding Sources
Contact: Battalion
Public Works Department
Goals Addressed:
and Estimated
Chief Jason
Make necessary
Costs:
Konieczka
improvements to all
Pre -disaster
critical
Grants, costs
infrastructures.
unknown at this
time.
Strategy Vision/Objective
To upgrade all City owned assets to ensure they meet today's seismic standards.
Mitigation Strategy
Identify and prioritize those structures that are at the greatest risk and determine the best way to secure
funding to make the necessary improvements to those structures.
2-Year Objectives:
5-Year Objectives:
Long -Term
Perform a study and identify those
Utilize available grant money to upgrade
Objectives:
structures that are in the most need of
as many structures as possible.
Have all critical
upgrades.
infrastructure up to the
current seismic codes.
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Implementation Plan/Actions:
We had a seismic study conducted on our Fire Stations and some other City Facilities in 2008 which identified
three out of the four stations are deficient by today's standards. Two of those stations are being replaced with
new stations currently under construction, but the third's replacement station came up short on funding. We
have turned in the application for the Pre -disaster Mitigation Grant (PDM) to make the necessary upgrades to
that Fire Station, and we will know by 2020 if we will be rewarded with the grant.
Six other buildings owned by the City were found deficient in the same study done in 2008 with a total of 18.1
million needed to bring them up to seismic standards (this amount includes the 16 million for Station 51 and
7.7 million for Station 52 that would have been spent). Factoring inflation, 18.1 million in 2008 equates to
21.5 million in 2019.
Performance Measures
Have all City -owned structures up to the current seismic standards.
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