Tri-Dam Project

A partnership of the Oakdale and South San Joaquin Irrigation Districts

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Donnells Reservoir
Donnells Reservoir
Beardsley Reservoir
Beardsley Reservoir
Tulloch Dam
Tulloch Dam
Goodwin Dam
Goodwin Dam

Welcome to the Tri-Dam Project

Operations and maintenance of the Donnells, Beardsley and Tulloch projects, located on the Middle Fork of the Stanislaus River in Tuolumne County, California.

Tri-Dam Project is a partnership between the Oakdale Irrigation District and the South San Joaquin Irrigation District. Together they developed, operate and maintain the Donnells, Beardsley and Tulloch projects including the dams, tunnels, penstocks, powerhouses, communications systems, and general offices. These facilities are located on the Middle Fork of the Stanislaus River in Tuolumne County, California.

The “Upper Works” include Donnells and Beardsley dams, reservoirs, powerhouses and appurtenant facilities. The “Lower Works” refer to the Tulloch development below Jamestown reaching into both Calaveras and Tuolumne Counties.

Tri-Dam Project is governed by a joint board of directors composed of the five member boards of the two Districts. The day to day activities of Tri-Dam Project and Tri-Dam Power Authority are managed by a General Manager who reports to the board. The administrative offices of Tri-Dam Project are located in Strawberry, California.

Office Hours:

Weekdays 7:30 am – 4:30 pm
Closed every other Friday
View 2021 office closures

Save the Stan
http://www.savethestan.org/

Water Data

Data For 03/07/2021

Elevation (feet above sea level)

Donnells 4,758.82

Beardsley 3,300.10

Tulloch 500.29

Storage (acre feet)

Donnells 10,473

Beardsley 38,191

Tulloch 55,617

Outflow (cubic feet/sec)

Donnells 27

Beardsley 141

Tulloch 402


*Spilling

View historical data

Meeting Agendas

Project Agenda 2021-02-18
Authority Agenda 2021-02-18

News & Updates

2021 Tulloch Updates/Information

January 7, 2021 by Tri-Dam Project

Response to Tulloch Landowners Petition

September 22, 2020 by Tri-Dam Project

Road Conditions

Current road conditions to Beardsley and Donnells Reservoirs can be found on their respective pages.

Pinecrest Weather

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PO Box 1158 · Pinecrest, CA 95364-0158 · 209-965-3996