TransportationHighway 97 Salmon River Bridge No. 253 Replacement
DWB’s engineering and environmental services were retained by Surespan Construction Ltd. to assist in the replacement of the Salmon River Bridge, which is located along Highway 97, approximately 27 km north of Prince George, BC. The previous bridge was constructed in 1954 and consisted of a 54.9 m long, single span, truss and was deemed in need of replacement by the Ministry of Transportation and Infrastructure. The replacement bridge was a 66.5 m, single span, plate girder bridge with a cast-in-place deck.
This was a large multi-million-dollar project and DWB’s engineering and environmental departments provided a full scope of service. DWB’s engineering department provided all the drawings for the work, including a geometric design, abutment walls, piles, welding details, erection plans, isolation proposal, traffic management plan, and demolition plan. Multiple engineering reports were prepared including a girders stability and overturning analysis, abutment wall, sliding beam, and road certification.
DWB’s environmental department initiated work in September 2016 starting with invasive plant surveys of the project area. An environmental site reconnaissance provided the initial details that went into preparation of the Construction Environmental Management Plan for the project. DWB’s environmental team was on location to monitor construction, assist in mitigating potential environmental effects, and ensure regulatory compliance. During construction, DWB’s environmental department monitored water quality, salvaged hundreds of fish from portions of the river isolated from flow, developed fish habitat offsetting (compensation) plans, and were on location for final planting of offsetting areas.
Engineering services included:
- Soil testing
- Design drawings
- Record drawings
- Stability analysis
- Traffic management plans
- Demolition plans
Environmental services provided:
- Invasive plant survey
- Environmental management plans
- Environmental permitting
- Environmental monitoring
- Fish Salvage
- Water Quality Monitoring
- Post-construction reporting
- Habitat offsetting (compensation) plan