WEST APPROACH BRIDGE - VISION

Our vision for the SR 520 corridor is to become the premier gateway for the City of Seattle by reconnecting to the early Seattle vision of Nature meets City.yy

We intend to implement our Program in a manner that yields affordable solutions and fosters groundbreaking sustainability practices that support regional and local connectivity, ecology and the use of low-carbon materials. Further, the design of the corridor will balance aesthetics, functionality, proportion and sense of speed along the SR 520 facility to provide a memorable experience for all users.

November 2012DRAFT

Øresund BridgeCopenhagen, Denmark/Malmo, Sweden

Dauphin Island Bridge/Gordon Persons BridgeMobile County, Alabama

Robert Moses Causeway Suffolk County, New York

Eau Gallie CausewayEau Gallie, Florida

Tay Road BridgeFirth of Tay, Scotland

WEST APPROACH BRIDGE - DESIGN INSPIRATION

November 2012DRAFT

Baseline Design

NORMAL HIGH WATER LINE

WEST APPROACH BRIDGE - DESIGN PROGRESSION

November 2012DRAFT

9-20-2012Seattle Design Commission Meeting

NORMAL HIGH WATER LINE

WEST APPROACH BRIDGE - DESIGN PROGRESSION

November 2012DRAFT

10-10-2012Seattle Design Commission Subcommittee Meeting

NORMAL HIGH WATER LINE

WEST APPROACH BRIDGE - DESIGN PROGRESSION

November 2012DRAFT

Preferred Design

NORMAL HIGH WATER LINE

WEST APPROACH BRIDGE - DESIGN PROGRESSION

November 2012DRAFT

Preferred DesignExpansion Joints

NORMAL HIGH WATER LINE

WEST APPROACH BRIDGE - DESIGN PROGRESSION

November 2012DRAFT

November 2012DRAFT

Baseline

Preferred

NORMAL HIGH WATER LINE

NORMAL HIGH WATER LINE

West Approach Bridge South

West Approach Bridge South

West Approach Bridge North

West Approach Bridge North

WEST APPROACH BRIDGE - DESIGN PROGRESSION

SUSTAINABILITY GOALS Design and construc on of the West Approach Bridge con nues to meet and augment SR 520 sustainability goals by lessening construc on impacts and reducing concrete volumes by nearly 50 percent from the baseline design to the preferred design. This reduc on in concrete is achieved through:

• Innova ve technologies, such as seismic isola on bearings• Simplifi ca on and reduc on of substructure elements

The reduc on in concrete has the poten al to produce signifi cant carbon dioxide (CO2) emission reduc ons.

1

6

Minimumcolumn

diameter

1/3

1/3

1/3

8’-7”

Minimum column

diameter

Isolation bearing

Future screw jack location

TOP OF COLUMN

BOTTOM OF COLUMN

COLUMN ELEVATION

6’-0” 3’-6”

Tangent curve

Beginning of flare

TYPICAL COLUMN DETAILS6’ Ø COLUMN 5’ Ø COLUMN 4.5’ Ø COLUMN

November 2012DRAFT

TYPICAL COLUMN DETAILS AT EXPANSION JOINTS PIER 34 PIER 27 PIERS 9 & 18

1

6

Minimumcolumn

diameter

1/3 1/31/3

8’-7”

Minimum column

diameter

Isolation bearing

Isolation bearing

Future screw jack location

TOP OF COLUMN

BOTTOM OF COLUMN

COLUMN ELEVATION

7’-0”

Tangent curve

Beginning of flare

10’-6”

November 2012DRAFT

TEMPORARY SUPPORTS

November 2012DRAFT

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B VIEW C

VIEW D

VIEW E

Union Bay

Lake Washington

November 2012DRAFT

A: VIEW FROM HUSKY STADIUMEX

ISTI

NG C

ONDI

TION

SBA

SELI

NE D

ESIG

NCU

RREN

T DE

SIGN

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B

VIEW C

VIEW D VIEW E

Union Bay

Lake Washington

November 2012DRAFT

B: VIEW FROM UW WATERFRONT ACTIVITIES CENTEREX

ISTI

NG C

ONDI

TION

SBA

SELI

NE D

ESIG

NCU

RREN

T DE

SIGN

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B

VIEW C

VIEW D VIEW E

Union Bay

Lake Washington

November 2012DRAFT

C: VIEW FROM MARSH ISLAND BOARDWALKEX

ISTI

NG C

ONDI

TION

SBA

SELI

NE D

ESIG

NCU

RREN

T DE

SIGN

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B

VIEW C

VIEW D VIEW E

Union Bay

Lake Washington

November 2012DRAFT

D: VIEW FROM WEBSTER POINTEX

ISTI

NG C

ONDI

TION

SBA

SELI

NE D

ESIG

NCU

RREN

T DE

SIGN

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B

VIEW C

VIEW D VIEW E

Union Bay

Lake Washington

November 2012DRAFT

E: VIEW FROM NORTH MADISON PARKEX

ISTI

NG C

ONDI

TION

SBA

SELI

NE D

ESIG

NCU

RREN

T DE

SIGN

FEIS VIEWS KEY

FLOATING BRIDGE

VIEW A

VIEW B

VIEW C

VIEW D VIEW E

Union Bay

Lake Washington

November 2012DRAFT

23

45

67 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

3536

3738

3940

4142

1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

BELVEDERE

LUMINAIRES

BELVEDERE

Foster Island

WSDOTPeninsula

SIGN BRIDGE SIGN BRIDGESIGN BRIDGE

NORTH ELEVATION

PLAN

FRAME 3

FRAME 3

View 2

View 1

View 3 View 4

MAINTENANCE CATWALK& BELVEDERE

MAINTENANCE CATWALK& BELVEDERE

SIGN BRIDGE

EXPANSION JOINT EXPANSION JOINT EXPANSION JOINT EXPANSION JOINT EXPANSION JOINT

NAVIGATION CHANNEL

FLOATING BRIDGEBELVEDERE

SIGN BRIDGE

ABOVE-BRIDGE ELEMENTS

November 2012DRAFT

View 1 Transition from Lake Washington to Union Bay View 2 Pedestrian view along shared-use path

View 3 Passing over Foster Island View 4 Approaching land and Montlake portal

November 2012DRAFT

FRAME 3, NORTH ELEVATION

pedestrian railing belvederes

sign bridges luminaires

shaft caps

pedestrian railing

luminairesshaft caps

November 2012DRAFT

belvederes & maintenance catwalks

56’

6’

SR 520 westbound lanes

6’

14’ shared-use path 4’-high pedestrian barrier

sign bridges

November 2012DRAFT

West Approach Bridge

Key

Regional shared-use path

General purpose lanes

Transit/HOV lanes

NAVIGATION CHANNEL

PIER 40

PIER 42

PIER 41

PIER 39

WEST APPROACH BRIDGE

FLOATING BRIDGE AND LANDINGS PROJECT

CHANNELIZATION AT PROJECT INTERFACE

TRANSITION SPAN - SOUTH ELEVATION

West Approach Bridge

N

ARCHITECTURAL FEATURES AT PROJECT INTERFACE

November 2012DRAFT