Post Street Pedestrian and Utility Bridge Replacement

Construction Info

Project Number: 2017105

Design/Construction Estimate: $20,000,000.00

Project Location: Post Street Bridge

Description: Post Street bridge replacement. Project funded with federal funds.

Status: Design

Project Manager - Design: Mark Serbousek, 509.625.6700, mserbousek@spokanecity.org

Construction Start Date: Spring 2020

Substantially Completed Date: Winter 2021

Award Date: To be determined

Background

The 333-foot-long Post Street Bridge was built in 1917, spanning the Spokane River between its two sets of magnificent falls. The bridge is a reinforced concrete open spandrel deck arch bridge. Today, its deck has one lane of northbound vehicle traffic along with space for pedestrians and bicyclists; it also carries a 54-inch main sewer interceptor line. After more than 100 years of use, the bridge is in need of replacement.

Design work for the bridge is under way. The City has determined that the historic arches can be preserved and continue to be an integral part of the bridge going forward. As a result, overall, the new bridge will look much as it does today, by rehabilitating the existing arches and using modern construction techniques to maintain the historic look and feel of the bridge.

The bridge deck, meanwhile, will be redesigned for future flexibility and multiple uses starting with one northbound lane of traffic, the Centennial Trail, and pedestrian circulation space.

Construction on the bridge replacement project is now planned for the spring of 2020. The project is expected to take about 20 months to complete.

Site Plan

Overall Site Plan
Site Plan Key

Traffic and circulation on both ends of the bridge will be redesigned to accommodate the approaches and future flexibility of the bridge.

In 2018, the City received input from the public on how to accommodate vehicles, bicyclists, and pedestrians on the 54-foot wide bridge deck. This includes one vehicular travel lane northbound, pedestrian and bicycle routes as well as accommodating the Centennial Trail.

The south approach to the bridge must tie into one lane of Post Street while the Centennial Trail will need to be routed to the northeast side of Post Street to allow connection to Riverfront Park. Pedestrian and bicycle circulation and civic gathering space can be activated in the remaining space on the deck.

The north bridge approach, including Summit Parkway, will be reconfigured to provide for a more graceful and safer transition. The reconfiguration of Summit Parkway will also provide opportunities for recreational amenities in the new space as well as landscaping and potential gateway features to downtown.