PROJECT: Transportation

Slaughterhouse Bridge Replacement

St. Maries, Idaho


Benewah County & Local Highway Technical Assistance Council (LHTAC)

Construction Value:

$1.1 Million


Slaughterhouse Bridge is a one-lane, single-span bridge located about 10 miles east of St. Maries, Idaho.  The road in which the bridge is located crosses the 3500-ft wide floodplain of the St. Joe River, with the bridge spanning a connected slough.  Nearly every year, the roadway and bridge are overtopped by floodwaters, making the roadway impassable and often submerging the bridge.  The bridge was built in 1970 out of salvaged railcar beams, and has reached the end of its useful life. 

T-O Engineers is the prime consultant on this federally funded project.  We completed topographic and bathymetric surveys of the Slaughterhouse Draw and St. Joe River, and are studying the hydraulic characteristics of the floodplain.  Alternatives are being evaluated to replace the crossing without significantly impeding floodwaters or impacting the adjacent wetland environment.

Services provided:

  • Phased scope
  • Project management & administration
  • Surveying & Mapping
  • Hydrologic and hydraulic analysis
  • Rural county floodplain development permit
  • Geotechnical investigation and Materials reports
  • Environmental - Threatened & endangered species