St. Croix River Crossing Dispute
Design Presentation - Alternative D

Slide #20 - D1 – Steel thru trusses

Slide #21 - D1 – Steel thru trusses - profile

Slide #22 - Example of a thru truss

Slide #23 - Example of a detail of a thru truss

Slide #24 - D2 – Steel bow string “main span” with haunch concrete girders, one arch over the bridge

Slide #25 - D2 – Steel bow string “main span” with haunch concrete girders – profile

Slide #26 - D3 – Concrete arches, flat with arches under the bridge

Slide #27 - D3 – Concrete arches - profile

Slide #28 - D4 – Concrete main span thru arch (over) with concrete arches (under)

Slide #29 - D4 – Concrete main span thru arch (over) with concrete arches (under) – profile

Slide #30 - Example of D4 – Yaquin Bay Bridge

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