Multnomah County Willamette River Bridges Capital Improvement Plan (2015-2034) FINAL Prepared for: Multnomah County Department of Community Services Bridge Division 1403 SE Water Ave. Portland, OR 97214 503 988-3757 www.multco.us/bridges Table of Contents 1 Executive Summary .......................................................................................................................................................................................................................... 1 2 Results .............................................................................................................................................................................................................................................. 4 2.1 Prioritization Process for Bridge CIP Projects .......................................................................................................................................................................... 4 2.2 Bridge CIP Project Costs ........................................................................................................................................................................................................... 5 3 Bridge CIP Development Process Summary ..................................................................................................................................................................................... 8 3.1 Existing Information Review .................................................................................................................................................................................................... 9 3.2 Field Reconnaissance and Hydrographic Survey .................................................................................................................................................................... 10 3.3 Criteria Development and Project Prioritization Process ...................................................................................................................................................... 11 3.4 Cost Estimating ...................................................................................................................................................................................................................... 14 3.5 Logical Groupings and Bundling Methodology ...................................................................................................................................................................... 17 3.6 Cost Risk Assessment ............................................................................................................................................................................................................. 17 3.7 Seismic Philosophy and Bridge Replacement ........................................................................................................................................................................ 19 3.8 Public Involvement and Outreach.......................................................................................................................................................................................... 20 4 Technical Analysis .......................................................................................................................................................................................................................... 24 4.1 Mechanical and Electrical Systems and Components ............................................................................................................................................................ 24 4.2 Programmatic Seismic Assessment ........................................................................................................................................................................................ 24 4.3 Roadway and Roadway Maintenance .................................................................................................................................................................................... 25 4.4 Bridge Structural Elements and Maintenance ....................................................................................................................................................................... 26 4.5 Paint Systems ......................................................................................................................................................................................................................... 27 4.6 Programmatic Bridge Replacement ....................................................................................................................................................................................... 27 4.7 Multimodal Elements (Bicycle, Pedestrian and Transit) ........................................................................................................................................................ 28 4.8 Environmental ........................................................................................................................................................................................................................ 29 Date: April 28, 2015 Capital Improvement Plan Report – FINAL P a g e | i Tables Table 1 – Summary of Project Costs by Target Time Interval .................................................................................................................................................................. 2 Table 2 – Summary of Project Costs by Bridge Complex ......................................................................................................................................................................... 2 Table 3 – Summary of Bridge CIP Costs by Primary Work Category ........................................................................................................................................................ 3 Table 4 – Summary of Project Costs by Target Time Interval .................................................................................................................................................................. 6 Table 5 – Summary of Project Costs by Bridge Complex ......................................................................................................................................................................... 6 Table 6 – Summary of Bridge CIP Costs by Primary Work Category ........................................................................................................................................................ 7 Table 7 – Development Approach Categories of the Bridge CIP Cost Elements ................................................................................................................................... 14 Table 8 - List of Projects with Elements from Stakeholder Engagement Requests ............................................................................................................................... 22 Table 9 - List of Projects with Bicycle and Pedestrian Improvements ................................................................................................................................................... 28 Figures Figure 1 – Multnomah County Willamette River Bridges Overview ........................................................................................................................................................ 1 Figure 2 – Multnomah County Downtown Portland Bridges ................................................................................................................................................................... 2 Figure 3 – Summary of Project Costs by Target Time Interval ................................................................................................................................................................. 6 Figure 4 – Summary of Project Costs by Bridge Complex ........................................................................................................................................................................ 6 Figure 5 – Summary of Bridge CIP Costs .................................................................................................................................................................................................. 7 Figure 6 – Bridge CIP Development Process ............................................................................................................................................................................................ 9 Figure 7 – Burnside Bridge Surrounding Conditions from Hydrographic Investigation ......................................................................................................................... 10 Figure 8 – Project Prioritization Process ................................................................................................................................................................................................ 11 Figure 9 – Project Bundle Development Approach................................................................................................................................................................................ 17 Attachments Attachment A – Report Terms and Definitions List Attachment B – Multnomah County Willamette River Bridges Maintenance Limits Graphics Attachment C – Bridge CIP Project Costs Summary Tables – All Projects Attachment D – Bridge CIP Project Costs Summary