City of Tacoma – RFB – Riffe Lake Fishing Trail Rock Fall Mitigation – PG23-0168N – Due 10/06/23
Due Date: October 6, 11 AM
Pre-Proposal Meeting: A pre-proposal meeting will not be held.
Project Scope: Cowlitz Project, Riffe Lake North Shore Fishing Trail, has experienced multiple rock fall events. Past rock fall events have yielded rocks and boulders on the order of magnitude of 12 to 18-in. wide. The latest rock fall event in May 2023 has yielded multiple boulders that are nearly 3-ft. wide and blocking the walkway of the Fishing Trail. Many cracks and fractures were observed in the remaining rock face. The fractures left the remaining rock face in a ‘blocky’ condition that has several instances of a rock masses precariously hanging on to the right abutment. Tacoma Power is proposing rock scaling be performed to stabilize the rock face and mitigate future rock fall events.
Estimate: $200,000