Cherry Valley Dam Spillway Short-Term Improvement Project

The San Francisco Public Utilities Commission is undertaking the Cherry Valley Dam Spillway Short-Term Improvement Project to rehabilitate a segment of the unlined spillway discharge channel in Tuolumne County, California, which has been obstructed by debris from landslides on adjacent steep slopes. The primary objective is to restore the channel’s original north-south alignment to prevent spillway flows from being diverted toward the Cherry Power Tunnel Adit and public camping areas, thereby mitigating safety and environmental risks. Work will include re-exposing and stabilizing the bedrock channel, constructing an armored fill embankment with riprap, boulders, and concrete, installing grouted riprap for slope erosion control, and improving access roads—all in compliance with SFPUC Standard Construction Measures and applicable local, state, and federal regulations. The project is scheduled for execution between June and October 2026 under a single-shift timeline, with a potential accelerated four-month schedule if double shifts are employed. All construction activities must adhere to strict environmental controls, including vibration limits of 0.2 inches per second peak particle velocity, air quality thresholds of 1,000 lbs/day of ozone precursors, and stormwater runoff management in alignment with Regional Water Quality Control Board standards. Compliance with CEQA, the Maher Ordinance, and other local environmental ordinances is mandatory, and any discovery of cultural resources, endangered species such as the Mariposa clarkia or Townsend’s big-eared bat, or human remains requires immediate work stoppage and reporting to relevant authorities. The project falls under NAICS code 237990 and is administered by the City and County of San Francisco through its SFPUC, with primary point of contact Timothy Johnston, Senior Planner, and Project Applicant Kelly Yong. There is no formal solicitation number or contract value available, and the procurement is framed as a forecast with no specified set-aside, contract type, or pricing structure. No contract clauses from FAR Sections I, M, or K are present, nor are there detailed packaging, marking, or invoicing requirements specified beyond general compliance with DOT, EPA, OSHA, and Cal/OSHA standards. The lead agency maintains full inspection and acceptance authority, with all work to be performed on-site near Cherry Valley Dam and Lake, approximately 12 miles north of State Route 120. Materials will be delivered to Staging Area 2 prior to transport to the work zone. Environmental mitigation measures, including biological monitoring and noise and dust controls as