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 Lake Water Resources Investigation.

Enlarging the reservoir would improve water supply reliability, reduce flood damages, and improve water temperatures in the Sacramento River below the dam for anadromous fish survival.

Public Outreach Material

  • Lakehead Community 

Potential National Benefits

  • Additional 634,000 acre-feet of stored water for the environment and for water users
  • Improved water supply reliability for agricultural, municipal and industrial, and environmental uses
  • Reduced flood damage
  • Improved Sacramento River temperatures and water quality below the dam for anadromous fish survival


2020 – Draft (August) and Final (November) Supplemental Environmental Impact Statement released

2018 - 2020 – Preconstruction and design phase (environmental, cultural, design data collection) following Congressional approval of $20 million in Water Infrastructure Improvements for the Nation (WIIN) Act funding in March 2018

Other activities include: Consultations and coordination with tribal interests, land-owners, government and non-government agencies; real estate planning; and arranging for a non-federal cost share partner

The total cost of the project is estimated at $1.4 billion (in 2014 dollars)

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

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

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

2014 – Preparation of Final Feasibility Report/EIS


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Last Updated: 3/24/22