Shasta Dam and Reservoir Enlargement Project

Shasta Dam Aerial Photograph


Shasta Lake, located in northern California, is the largest reservoir in Reclamation’s Central Valley Project. Reclamation’s feasibility study and reports have evaluated potential effects of an array of alternative plans to determine the technical, environmental, economic and financial feasibility of enlarging the existing Shasta Reservoir as a part of the Shasta Investigation. Enlarging the reservoir could improve water supply reliability, reduce flood damages, and improve water temperatures in the Sacramento River below the dam for anadromous fish survival.

Fact Sheet

Potential National Benefits

  • Increased water supply reliability; 47.3 to 113.5 thousand-acre-feet (TAF) per year in dry and critical years
  • Increased water storage; 256 to 634 TAF/yr providing greater operational flexibility
  • Increased number of out-migrating juvenile Chinook salmon; 61,000 to 813,000 fish/yr
  • Modernized recreation facilities and increase in recreation; from 85,000 to 307,000 visitor days
  • Reduced flood damage; nominal and incidental
  • Additional hydropower; 52 to 133 gigawatt hours (GWh)/yr


2014 – Preparation of Final Feasibility Report/EIS

2015 – Secretary of the Interior provided final reports to the public and to Congress

2016 – Reclamation provided study updates to interested San Joaquin Water Districts

2017/2018 – Reclamation seeking construction cost share partners; Senate considering authorization

2018 – 18.5 feet Dam Raise Option received $20M in WIIN funding for preconstruction activities for the Shasta Dam and Reservoir Enlargement Project; MP Region is determining cost share partner(s)


Contact Info

Richard Welsh and Casandra Arthur
(Acting) Shasta Dam and Reservoir Enlargement Project managers




Last Updated: 8/23/18