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
View 2022 office closures

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

Water Data

Data For 06/28/2022

Elevation (feet above sea level)

Donnells 4,912.17

Beardsley 3,384.50

Tulloch 507.95

Storage (acre feet)

Donnells 62,718

Beardsley 88,972

Tulloch 64,429

Outflow (cubic feet/sec)

Donnells 43

Beardsley 55

Tulloch 901


*Spilling

View historical data

Meeting Agendas

Special Agenda 2022-06-30

News & Updates

Tulloch 2022 Internal Guidance Memo—Grandfathered Facilities

April 22, 2022 by Tri-Dam Project

Tulloch Spring 2022 Fill Schedule

March 10, 2022 by Tri-Dam Project

Road Conditions

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

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