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Which Replacement Bridge Type?

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Which Replacement Bridge Type? Welcome to the Sellwood Bridge Project Open House! 6 – 9 p.m. Please sign in here An orientation presentation will take place soon What to expect tonight The goal for this meeting is to: • Get your feedback on bridge types • Talk about the five alternatives that will be studied in the draft EIS • Start talking about funding sources What can you do? We are asking you to do the following: • Attend a short presentation (listen for an announcement) • Submit a comment form telling us which bridge types should be studied more And you can always ask the project team or Bridge Type Working Group members questions Five Alternatives The following five alternatives: • Were selected by the Policy Advisory Group. • These alternatives are conceptual, not final plans. Details, such as property access, are being refined. • They will be studied more in the Draft Environmental Impact Statement (Draft EIS) to support selection of a preferred alternative. What is a Draft EIS? • During the EIS, these five alternatives will be studied in detail. Identifying and evaluating the positive and negative impacts of each alternative is part of the EIS process. • When the Draft EIS is finished, you will have a chance to review it and tell us what you think. • Your comments will be taken to the Community Task Force and Policy Advisory Group. • They will then select a preferred alternative that fulfills the Purpose and Need Statement. Purpose and Need Statement Purpose: The purpose of the proposed action is to rehabilitate or replace the Sellwood Bridge within its existing east‐west corridor to provide a structurally safe bridge and connections that accommodate multi‐ modal mobility needs. Project Needs: 1. Provide structural capacity to accommodate safely various vehicle types, including transit vehicles, trucks, and emergency vehicles; and to withstand moderate seismic events; 2. Provide a geometrically functional and safe roadway design; 3. Provide for existing and future travel demands between origins and destinations served by the Sellwood Bridge; 4. Provide for connectivity, reliability, and operations of existing and future public transit; 5. Provide for improved freight mobility to and across the bridge; and 6. Provide for improved pedestrian and bicycle connectivity, mobility and safety to and across the river in the corridor. Alternative A Rehabilitation with a Separate Bicycle/Pedestrian Bridge Alternative B Rehabilitation Bridge Alternative CThree‐Lane Double‐deck Replacement Bridge Alternative D Two‐Lane Staged Construction Replacement Bridge Alternative E Two‐Vehicle and Two‐Transit Lanes Replacement Bridge (to be removed) Project Schedule Bridge Design Types for Replacement Bridges The following bridge types can be used for a replacement bridge. All costs are for moderately priced bridges (Box Girder and Delta Frame). Cost estimates for the higher‐priced bridge types are being developed. Box Girder Bridge Type Box Girder Examples Delta Frame Bridge Type Delta Frame Examples Deck Arch Bridge Type Deck Arch Examples Through Arch Bridge Type Through Arch Examples Extradosed Bridge Type Extradosed Examples Cable-Stayed Bridge Type Cable-Stayed Examples Bridge Design Types for Bicycle/Pedestrian Only Bridges These six bridge types can also be used for the bicycle/ pedestrian bridge. Two other bridge types can only be used for the Bicycle/ Pedestrian bridge, which is part of Alternative A. Stress-Ribbon Suspension Stress-Ribbon Bicycle/Pedestrian Bridge Type Suspension Bicycle/Pedestrian Bridge Type Tell us: one moderately priced & one higher-priced bridge type Which replacement bridge type? Assuming that there are no limitations to what could eventually be built, which moderate and higher‐priced designs would you choose? Which moderately priced bridge type? Which higher-priced bridge type? Through Arch Comment Sheet Question 1 Tell us: one Bicycle/Pedestrian bridge type for Alternative A Which bicycle/pedestrian-only bridge type? The existing bridge would be rehabilitated in Alternatives A and B, so the bridge type would not change. Some of the pictures below suggest how the bike/pedestrian bridge looks next to the existing bridge. Stress-Ribbon Suspension Comment Sheet Question 2 Tell us: one bridge type for Alternative C Which double-deck bridge type? These higher‐priced bridge types are the only ones that can work with a double‐deck bridge. Through Arch Cable-Stayed Comment Sheet Question 3 Tell us: one moderately priced bridge type for Alternative D Which replacement bridge type? This bridge would be constructed at the existing location (yellow south). Both moderately and higher‐priced bridge types are possible here. Which moderately priced bridge type? Through Arch Which higher-priced bridge type? Only one higher‐priced bridge type will work for Alternative D, the Deck Arch. Cable-StayedDeck Arch Comment Sheet Question 4 Tell us: one moderately priced and one higher-priced bridge type for Alternative E Which replacement bridge type? Both moderately and higher‐priced bridge types are possible here. Which moderately priced bridge type? Which higher-priced bridge type? Through Arch Comment Sheet Question 5.
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