portage bay bridge · 2018-06-18 · cable stay concept box girder concept portage bay bridge view...
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City of Seattle
Portage Bay BridgeVision
September 2014
Design vision for Portage Bay Bridge:
� The Portage Bay Bridge is both a distinctive and context-sensitive element within the family of SR 520 bridges.
� The bridge serves as a connecting thread, tying together the tree-covered Roanoke ridge to the west and the heart of the residential, research and multimodal transportation at Montlake to the east.
� With the recommendation of a shared-use path, the Portage Bay Bridge helps to complete regional connectivity for all modes of users throughout the SR 520 corridor.
Cable stay concept
Box girder concept
DRAFT
Cable stay concept
View from the Seattle Yacht Club looking southeast
FOR DISCUSSION PURPOSES ONLY
City of Seattle
Existing bridge
Cable stay concept
Box girder concept
Portage Bay BridgeView from University bridge looking southeast
September 2014
FOR DISCUSSION PURPOSES ONLYDRAFT
City of Seattle
September 2014
Box girder
Cable stay concept
Box girder concept
Both concepts meet our vision and goals by:� Gap between structures allows: � More light to reach the water and land below � Provides break in bridge width� Raised bridge profile on east end provides boaters with easier access and improved views
Portage Bay BridgeView from under bridge looking west
DRAFT FOR DISCUSSION PURPOSES ONLY
City of Seattle
September 2014
Cable stay concept
Box girder concept
Portage Bay BridgeView from 10th and Delmar lid
Both concepts meet our vision and goals by:� Minor and major elements provide function, lighting, signage support and provide a sense of rhythm moving across bridge� Cable elements create a unique moment on the bridge, which changes at different perspectives
DRAFTFOR DISCUSSION PURPOSES ONLY
City of Seattle
Cable stay concept
Box girder concept
Both concepts meet our vision and goals by:� Shared-use path provides local and regional connectivity for all users� Raised bridge profile on east end improves access for all users� Path provides views � Bridge elements help provide scale to the user experience and add visual interest
Portage Bay BridgeView of shared-use path looking west
September 2014
DRAFT FOR DISCUSSION PURPOSES ONLY
City of Seattle
September 2014
Cable stay concept
Box girder concept
June 17, 2014 concept
July 8, 2014 concept
June 17, 2014 concept
SCDP concept, 2012
Portage Bay BridgeElevation and profile design studies
July 8, 2014 concept
SCDP concept, 2012
DRAFTFOR DISCUSSION PURPOSES ONLY
14’Managed shoulder
11’GP
11’GP
11’GP
11’GP
8’Shoulder
12’Transit/HOV
12’Transit/HOV
2’ 6’ 2’plantedmedian
Sho
ulde
r
Sho
ulde
r
105’
1.5’ 1’1’ 1.5’
133’
14’Managed shoulder
11’GP
11’GP
11’GP
11’GP
8’Shoulder
12’Transit/HOV
12’Transit/HOV
2’ 19’ 2’gap between
structures
Sho
ulde
r
Sho
ulde
r
1.5’ 1.5’1.5’14’
Shared-use path
1.5’
BOYER AVE E
10th AND DELMAR LID
TF 007TF 053TF 012TF 241
-2.6%
TF 061TF 061TF 102TF 052TF 052TF 00310
2 FT
149
FT129
FT
190
FT
147
FT
224
FT
QCYC
MONTLAKE LID
10th AND DELMAR LID
MONTLAKE LID
BOYER AVE E
-4.6%
QCYC-1.9%
300 FT225 FT 150 FT typicalTF 002TF 003142 FT
Portage Bay Bridge Options Comparisons
Elevation views looking north
Section views looking east
NOTE: The shared-use path is not included in the baseline design.
September 2014
FEIS baseline
Box girder north shift
Cable-stayed north shift
FEIS baseline
Split box girder and cable stay north shift
faux arches
W E
W E
W E
10th AND DELMAR LID
MONTLAKE LID
BOYER AVE E
TF 053TF 012TF 241
-2.6%
TF 061TF 061TF 102TF 052TF 052TF 003
QCYC
350 FT 350 FT
DRAFT
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