HomeMy WebLinkAboutTrans 2012-05-21 Item 2A - Discussion - Tukwila Urban Center Pedestrian-Bicycle BridgeCity of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
TO:
FROM
BY:
DATE:
Mayor Haggerton
Transportation Committee
Bob Giberson, Public Works Director
Cyndy Knighton, Senior Engineer
May 18, 2012
SUBJECT: Tukwila Urban Center (TUC) Pedestrian /Bicycle Bridae
Project No. 90510403
Twin Tied Arch Bridge Architectural Selection
ISSUE
Present the TUC Pedestrian /Bicycle Bridge Architectural style selections for discussion.
BACKGROUND
In 2005, Tukwila received a $200,000 grant to begin the design of a new signature bridge across the
Green River as a key pedestrian and bicyclist connection between the Sounder's Tukwila Longacres
Station and the Tukwila Transit Center along the TUC Urban Core. KPFF was retained and, in
October 2011, Council considered the Type, Size, and Location (TS &L) report on the
Pedestrian /Bicycle Bridge. After discussions on the merits of each bridge type and location, as well as
public input during the Council discussions and an online poll, Council directed staff to proceed with
the final design of the Twin Tied Arch bridge on a straight alignment without a future accommodation
of a second bridge over West Valley Highway. An additional $1,250,833 in grants was awarded in
2011 to complete the design and environmental work with completion scheduled by the end of 2013.
DISCUSSION
The design team has developed design options for the bridge and wayfinding approaches. Public
Works, Planning, Parks and Recreation, and Economic Development have all participated in two staff
workshops that discussed specific architectural style options available, trail approach options, as well
as considered right -of -way impacts and park opportunities. Staff will be presenting the trail approach
and architectural design options with a scale model. All options are within the same cost estimate that
was presented in October, 2011 with the TS &L report.
Cost estimates from the TS &L report include a
50% design contingency. A new cost estimate
will be prepared this year to include more details
from the preliminary engineering currently
underway. No right -of -way cost estimates are
available yet.
Mobilization 819,900.00
..I
Bridge 4,629,300.00
West Landin g 642,000.00
East Landing 1,799,100.00
Total (2008 7,890,300.00
RECOMMENDATION
For information only.
W: \PW Eng \PROJECTS\A- RW RS Projects \TUC Ped Bicycle Bridge (90510403) \Info Memo Arch Styles Discussion 5 -18 -12 sb.docx