The bridge, originally constructed in 1917, is in need of replacement. The proposed design for the new bridge maintains the historic arches and includes new post tensioned concrete girders capable of spanning the entire river. The historic arches are no longer needed structurally but will remain as an integral part of the new design as a symbolic Spokane icon of the past. The deck of the bridge will be designed for future flexibility and multiple uses starting with one north bound lane of traffic, the Centennial Trail, and pedestrian circulation space.
Traffic and circulation on both ends of the bridge will be redesigned to accommodate the approaches and future flexibility of the bridge.
The City would like public input on how to accommodate vehicles, bicyclists and pedestrians on the 51 ft. 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.
Concept #1, the balanced approach to the bridge configuration allows for a 14 ft. wide vehicular right-of-way down the center of the Post Street Bridge, with 3ft. buffer zones on both sides, shown in red. Flanking either side of the vehicular right-of-way is a 15.5 ft. wide Centennial Trail route (northeast-brown) and a 15.5 ft. wide pedestrian route (southwest-green).
Concept #2, the unbalanced approach to the bridge configuration allows again for a 14 ft. wide vehicular right-of-way with 3 ft. buffer zones on both sides, however, it is offset from the centerline to create more usable pedestrian space opportunities (18 ft.) shown in green. The adjacent 12 ft. wide Centennial Trail (brown) is located on the northeast side of the bridge.
Concept #3, the wavy approach to the bridge configuration introduces curvilinear 14 ft. wide vehicular right-of-way, provides traffic calming, yet reduces usable pedestrian spaces on both sides of the bridge. The Centennial Trail is again located on the northeast side of the bridge.
Concept #4, the mid road approach to the bridge configuration allows vehicles (14 ft. wide lane) and through cyclists using the Centennial Trail (12 ft. wide lane) the center space of the bridge, with exterior lanes designated to pedestrian space.
Concept#5, the roadway is placed on the upstream side of the bridge structure (with a 14ft. wide lane), a (12 ft. wide lane) Centennial Trail and a (18 ft. wide) pedestrian space on the downstream side of the bridge.
*Note: The Centennial Trail and pedestrian space can be located on either side of the bridge in any concept.
Safety Barrier Concept #1: Textured concrete formliner base topped with a metal railing. Examples of two formliners shown.
Safety Barrier Concept #2: Concrete balustrades consistent with the historic nature of Spokane area bridges at the time of their original construction.
Safety Barrier Concept #3: Semi-transparent railing system that would enable river views. This barrier is comprised of a two tiered steel rail system.
Please tell us which deck circulation and which safety barrier design you like best by completing this quick online survey.
Project Number: 2017105
Design/Construction Estimate: $13,500,000.00
Project Location: Post Street Bridge
Description: Post Street bridge replacement. Project funded with federal funds.
Status: Preliminary Design
Project Manager - Design: Mark Serbousek, 509.625.6700, email@example.com
Project Manager - Construction: Construction Management, 509.625.7722
Construction Start Date: Winter 2018 or late spring 2019
Substantially Completed Date: Summer of 2021
Award Date: To be determined