Folsom Lake is operated by California Department of Water Resources / USBR. This page explains who manages the lake, why water levels rise and fall, and where Lake Insights gets its data.
465.42 feet below full pool
−465.42 ft vs full pool
Folsom Lake is currently 465.42 feet below full pool and has remained relatively stable over the past seven days. Levels have held fairly steady over the past week while remaining below full pool.
Water levels respond to rainfall, river inflows, dam releases, flood-control operations, hydropower generation, and water supply needs.
Reservoir levels rise and fall for several reasons. These are common factors operators balance.
Rainfall & inflows
Rain and upstream river inflows can raise reservoir levels, especially after storms.
Downstream releases
Water released through the dam can lower lake levels and affect downstream flows.
Flood-control operations
Operators may store or release water to manage flood risk when conditions require it.
Water supply
Some reservoirs support municipal, industrial, or regional water supply needs.
Hydropower generation
Hydropower reservoirs may release water through turbines to generate electricity.
Seasonal weather
Dry periods, heat, evaporation, and seasonal rainfall patterns can affect lake levels.
Primary data source
Primary purposes
Lake Insights aggregates water level information from authoritative public sources such as the U.S. Army Corps of Engineers, NOAA AHPS, TVA, Bureau of Reclamation, power utilities, and other official lake operators. We preserve historical observations, calculate trends, and present lake conditions in a consistent format. For NOAA / National Weather Service — Advanced Hydrologic Prediction Service, we link to the official source whenever it is available. Lake Insights does not predict future lake levels unless an official forecast has been published by the managing authority.
How we source lake data · Primary source for Folsom Lake: NOAA / National Weather Service — Advanced Hydrologic Prediction Service
