FWS Red Rock Lakes NWR Bridge

AESI provided survey and geotechnical engineering services for this bridge installation project over Elk Springs Creek, directly east of Upper Red Rock Lake in southwestern, Montana. The purpose of the project was to provide passage over Culver Road while FHWA made improvements to Elk Lake Road and FWS configured the channel under the bridge to help reestablish Arctic Grayling in Elk Springs Creek. The bridge came from another location and consisted of a pre-engineered steel beam and concrete deck with abutments.

Utilizing information from the borings and laboratory testing, recommendations for bearing capacity, lateral earth pressures, and estimated settlements were established. The presence of unsuitable soils was investigated and recommendations made to address these conditions, including subgrade treatment type, specifications for engineered fill, placement techniques, and construction methods. Results of the borings, laboratory tests, and engineering analysis were presented in a geotechnical engineering report.