Dam Safety

NID owns and operates 15 dams under the jurisdiction of the California Division of Safety of Dams (DSOD). All of these dams, with the exception of Deer Creek Diversion and Loma Rica Airport, are also under the jurisdiction of the Federal Energy Regulatory Commission (FERC). Hydroelectric and Water Operations perform weekly/monthly dam safety inspections and take dam instrumentation readings when the sites are accessible. Displacements of the dams are obtained regularly by District Survey. In addition, the District submits annual dam safety surveillance monitoring reports to DSOD and FERC for their approvals.

Both DSOD and FERC perform their own annual dam safety inspections of these dams. These regulatory agencies also require that the District update Emergency Action Plans and various evaluations, including seismic stabilities, probable maximum flood, operational equipment, etc., on an as-needed basis. Once every 5 years, the FERC-jurisdictional dams are also inspected and evaluated by Independent Consultants.

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Click to enlarge

Additional information on the supervision and regulation of District dams can be obtained from the California Department of Water Resources, Division of Safety of Dams or the Federal Energy Regulatory Commission, Division of Dam Safety and Inspections, at the following links:




Annual Dam Safety Updates

The following files provide a summary of the dam safety related activities undertaken by the District in a given year. New annual summaries will be added in April of the following year.