Hydrologic_Analysis_Report_Conn_Dam_Watershed_and_Spillway_Napa_County,_California_May_1986.pdf

This is a Hydrologic Analysis Report prepared for Conn Dam in Napa County, California, dated May 1986, supporting the City of Napa's Request for Qualifications for comprehensive dam engineering services. The report documents hydrologic and hydraulic analysis of the Conn Dam watershed and spillway system, providing technical baseline data relevant to the City's current three-phase procurement initiative. The project seeks qualified multidisciplinary engineering consulting firms to deliver professional engineering, geotechnical, environmental, hydraulic, structural, and dam safety services. Phase one requires submission of a geotechnical data report to the California Division of Safety of Dams (DSOD) by December 31, 2028, followed by phase two assessing dam stability including deformation estimates under static and seismic conditions, and phase three developing a feasibility alternatives analysis addressing identified deficiencies including known spillway issues.

The procurement follows a Qualifications-Based Selection (QBS) process consistent with 2 CFR Part 200 and the Brooks Act, with federal funding anticipated for design and construction phases. The Conn Creek Dam project was included by project name in the 2022 Water Resources Development Act (WRDA), enabling the City to pursue federally authorized flood risk reduction studies through the U.S. Army Corps of Engineers (USACE). The selected consultant will provide technical support for regulatory compliance with DSOD, advance USACE-authorized flood risk reduction initiatives, evaluate long-term improvements to increase water supply reliability, and prepare documentation supporting future environmental review, design, permitting, and construction activities.