HomeMy WebLinkAboutPlanning 2017-06-22 Item 4 - Foster High School Expansion and Birth to Kindergarten - Attachment K: Tukwila School Campus Parking Analysis. . ....... ....
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Gibson Traffic Consultants
2813 Rockefeller Avenue
Suite B
Everett, WA 98201
425.339.8266
Tukwila School Campus
Parking Analysis
*NL-^
ATTACHMENT K
February 2017
GTC # 16 -178
209
Tukwila School Campus Parking Analysis
TABLE OF CONTENTS
1. DEVELOPMENT IDENTIFICATION ................................................... ............................... 1
2. METHODOLOGY .................................................................................... ..............................1
3. TYPICAL PARKING ANALYSIS .......................................................... ............................... 2
3.1 Existing Conditions ........................................................................... ............................... 2
3.2 Proposed Conditions ......................................................................... ............................... 2
4. EVENT PARKING ANALYSIS ............................................................. ............................... 3
5. CONCLUSIONS ...................................................................................... ............................... 3
LIST OF TABLES
Table 1: Existing Parking Supply and Demand ............................................... ............................... 2
Table 2: Event Parking Demand ...................................................................... ............................... 3
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Tukwila School Campus Parking Analysis
1. DEVELOPMENT IDENTIFICATION
Gibson Traffic Consultants, Inc. (GTC) has been retained to provide a parking analysis for the
Tukwila School Campus, including Foster High School, Showalter Middle School and the
proposed Birth to K school. Brad Lincoln, responsible for this report, is a licensed professional
engineer (Civil) in the State of Washington and member of the Washington State section of ITE.
The Tukwila School Campus is located along the north side of S 144 "' Street, east of 42 "d Avenue
S. Foster High School has access to S 144 "' Street and 42 "d Avenue S and includes the technology
building. Showalter Middle School is located east of Foster High School and has access to S 144 "'
Street. The proposed Birth to K school is located north of Showalter Middle School and is proposed
to have access to S 142 "d Street.
Improvements are proposed for Foster High School and Showalter Middle School, but the
improvements are not proposed to increase the student population of either school. Foster High
School currently has 878 students and Showalter Middle School has 632 students. The Tukwila
Birth to K school is proposed to have up to 440 students.
2. METHODOLOGY
The analysis of the typical parking for a normal day has been performed based on actual parking
observations at the existing Foster High School and Showalter Middle School performed by the
independent count firm National Data & Surveying Services (NDS) in September 2016.
Observations were performed after school began and before school dismissed to determine the
typical school parking demand.
Foster High School and the technology building currently have three lots for teachers, students and
visitor parking. These lots include the north lot, the south lot and the east lot. Foster High School
also has a bus area, but that has not been included in this analysis since teacher, student and visitor
vehicles are not allowed in this lot during school times. Showalter Middle School has two loops.
There is also the City of Tukwila Pool between Foster High School and Showalter Middle School.
This area has 17 designated parking spaces, although it appears Foster High School parking does
occur in this area. The demand for the pool parking spaces has therefore been included as part of
the analysis, but the parking supply in the pool area has not been included.
It is important to note that accessible spaces have been included in the supply and demand
calculations. The event parking demand is based on the attendance for events in the Performing
Arts Center and a football game using the typical vehicle - occupancy rate of 2.1 for recreational
events. This methodology is similar to analysis approved for other high schools in the Puget Sound
region.
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Tukwila School Campus Parking Analysis
3. TYPICAL PARKING ANALYSIS
3.1 Existing Conditions
The Foster High School and Showalter Middle School parking lots and their existing parking
supply and demand are summarized in Table 1.
Table 1: Existing Parking Supply and Demand
Location
Supplyl
Demand
Utilization
After
Start
Before
Dismissal
Peak
High School m- North Lott
102
66
67
67
66%
High School South Lot
11
6
9
9
820
High School -m East Lot3
138
55
51
55
40%
Middle School .. West Loop
17
17
15
17
100%
Middle School, East Loop
105
81
85
85
81° °0
TOTAL
373
225
227
233
62%
The total existing parking available at the Tukwila School Campus for normal school operations
is 373 parking spaces. The parking data shows that there were 225 vehicles parked after school
started in the morning and 227 vehicles parked before school dismissed in the afternoon. The
overall peak demand, based on the highest demand in the morning and the highest demand in the
afternoon, is 233 spaces. This results in a peak parking utilization of 62% and a demand rate of
0.15 for the 1,510 existing student population for Foster High School and Showalter Middle
School.
3.2 Proposed Conditions
The Tukwila Birth to K school is proposed to provide 80 parking spaces plus 12 additional parking
spaces within the bus loop that can be utilized for events. The changes to the Foster High School
are anticipated to result in 177 total parking spaces with 11 additional spaces in the bus loop that
can be utilized for events. The changes to Showalter Middle School are not anticipated to change
the existing parking supply. The parking supply after the Foster High School changes will be 299
parking spaces between Foster High School and Showalter Middle School. This represents a
utilization of approximately 78 %. The addition of the Tukwila Birth to K school will result in
approximately 378 parking spaces on the Tukwila School Campus with additional spaces being
available for events.
I Includes 11 accessible spaces
Z Includes supply and demand of technology building
3 Includes demand along pool area, but does not include supply.
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Tukwila School Campus Parking Analysis
4. EVENT PARKING ANALYSIS
The event parking analysis has been performed for a typical event in the Performing Arts Center
and a football game. An event in the Performing Arts Center includes up to 600 attendees and a
football game has up to 500 attendees. A graduation has not been considered since graduations are
proposed to be moved off -site. The parking demand for each of these event types is summarized
in Table 2.
Table 2: Event Parking Demand
Event Attendees Vehicle Parking
OCCUDancy Demand
Performing Arts Center 600 2.1 286
Football Game 500 2.1 238
The parking supply on the Tukwila School Campus (Foster High School with changes plus
Showalter Middle School) of 310 spaces for an event will provide adequate parking for the
anticipated maximum attendance in the Performing Arts Center and at a football game. The
anticipated parking demand of 286 parking spaces for a Performing Arts Center event will
represent a utilization of 92% of the total campus parking spaces.
The additional spaces created with the Tukwila Birth to K school will increase the total supply to
402 parking spaces and would result in a parking utilization of 71 % with an event in the Performing
Arts Center.
5. CONCLUSIONS
The Tukwila School Campus is anticipated to have 299 parking spaces for normal operations and
310 parking spaces for an event between Foster High School and Showalter Middle School. The
Tukwila Birth to K school is proposed to include 80 additional parking spaces with 12 additional
spaces for an event, resulting in a total supply of 379 parking spaces for normal operations and
402 parking spaces for an event.
The current parking demand at Foster High School and Showalter Middle School is below the
supply with the proposed changes. The utilization rate between the two schools is 78% with the
proposed parking changes to Foster High School. The highest demand for an event is 600 attendees
for an event in the Performing Arts Center. This is anticipated to generate a parking demand of
286 spaces. This event parking is also below the supply with the proposed changes and would have
a utilization rate of 92 %. Additional spaces created with the Tukwila Birth to K school will
increase the parking supply for events and reduce the utilization to 71 %.
Gibson Traffic Consultants, Inc. February 2017
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