Truckee River Pedestrian Trail – Truckee, CA

Holdrege & Kull provided geotechnical engineering services for a proposed bridge crossing that would span the Truckee River between West River Street and the west end of South River Street. The proposed bridge would have a clear span of approximately 190 feet without supporting piers or columns to avoid construction within the flood plain of the Truckee River. Support for the proposed bridge would be provided by single abutments constructed outside the flood plain on the north and south sides of the river. Appurtenant construction was to include an asphalt-paved Class I pedestrian trail. Approximately 15 to 25 feet of loose existing fill was encountered on the north side of the bridge that contained trash and debris. Dense granular soil with boulders was encountered on the south side of the bridge. Due to potential excessive settlement and to help prevent future scour and erosion along the river bank, H&K recommended removal and replacement of existing fill and construction of a Mechanically Stabilized Earth (MSE) or deepening footings to extend through the existing fill for support of the bridge abutment on the north side of the river. Shallow spread foundations were recommended for the bridge abutment on the south side of the river.