P2M Bridge Study-Working Mtg 080708 - trimet.org Bridge Study-Working Mtg 080708 Bridge High Point...

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Introduction of Selection Criteria

P2M Bridge Study-Working Mtg 080708

Selection Criteria-Introduction

THIS STEPSelection/Screening- “All Types” to “Many Types”

Engineering- “Pass-Fail”Architectural- Opportunities and Challenges

NEXT STEP

Selection/Screening- “Many Types” to “Some Types”

Engineering-Performance of types against Engineering criteria

Architectural- Performance of types against Aesthetic criteria

Baseline Assumptions

Clearance Diagram

75’ V. for 150’ H.

65’ V. for 300’ H.

River User Survey and River Levels

Clearance Diagram

Grades

4.75% max. for all modes

4.75% 4.75%

ALTERNATIVES TESTED-stacked

Grades

4.75% 4.75%

ALTERNATIVES TESTED-Different Grades

Grades

ALTERNATIVES TESTED-Ramps and Landings

Grades

Grades-No Vertical Exaggeration

4.75% max. for all modes

4.75% 4.75%

Bridge High Point and Navigational Route

Not In Same Location

Navigational Route

High Point

1195’

Not In Same Location

Hawthorn

Marquam

Ross Island

Assumed Nav. Route Existing Nav Route

Existing Nav Route

1392’

ALTERNATIVES TESTED-Same Point w/ Elevated SWF

ALTERNATIVES TESTED-Same Point wo/ Elevated SWF

Section Width

66’ (maximum)

SDEIS-Concrete Segmental SDEIS-Cable-Stayed

Transit Component Alternatives

Section Width

Number of In-Water Piers

4 (maximum)

SDEIS-Concrete Segmental SDEIS-Cable-Stayed

Issues- Shallow Water

Number of In-Water Piers

P2M Bridge Study-Working Mtg 080708 - trimet.org Bridge Study-Working Mtg 080708 Bridge High Point...

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