Humboldt Co. DPW - Jacoby Creek Bridge, Sediment Removal Project

Humboldt Co. DPW - Jacoby Creek Bridge, Sediment Removal Project

The bridge is located approximately one mile upstream from Humboldt Bay. This low gradient reach of Jacoby Creek accumulates excess sediment. The results of a recent stream channel assessment indicate that approximately 900 cubic yards of additional sediment has accumulated under the bridge area since the bridge was installed in 1988. Most of the excess sediment had deposited on the upper stream banks near the bridge abutments. The accumulated sediment is contributing to more frequent flooding in the area which sometimes causes Old Arcata Road to be closed to through traffic. The project involves removal of approximately 300 cubic yards of the accumulated sediment. Sediment removal activities will occur on both sides of the creek channel. Sediment removal activities will be confined within two areas that extended approximately 30 feet away from the abutments and 60 linear feet parallel to the stream channel. The excavation areas will extend approximately 12 feet beyond the edges of the bridge deck in both the upstream and downstream directions. The sediment removal areas are located above the flowing portion of the stream channel. Sediment will be removed to an average depth of two to three feet below the existing ground surface. Excavated sediment will be loaded into dump trucks and relocated to an offsite upland location.

Humboldt