Welcome to the Tri-Dam Project

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 Beardsley, Donnells and Tulloch projects including the dams, tunnels, penstocks, power houses, 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, power houses 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.

Dam Good Photos Beardsley DamDonnells DamTulloch Dam

Update for the Week Ending June 26, 2015

No new developments this week. Tulloch Reservoir is still to be operated pursuant to the posted US Bureau of Reclamation Schedule. Please continue to watch for updates.

April 10, 2015

Press Release from the Bureau of Reclamation

April 7, 2015 Update

OID/SSJID Press release regarding New Melones
Letter to David Murillo, Bureau of Reclamation

Weekly Update, for week ending April 3, 2015

The water situation continues to be very challenging. As has been publicized throughout the State, the April snow survey results demonstrate the dire situation throughout the region. Governor Brown has now directed mandatory restrictions to be applied throughout the entire state, to target additional water use reductions.

Last week, OID and SSJID announced that a preliminary agreement had been reached with the Bureau of Reclamation and National Marine Fisheries Service on a Temporary Urgency Change Petition (TUCP). The TUCP must be approved by the California State Water Resources Board, and as of today, that approval has not yet been received. The Districts remain hopeful that an agreement can be reached, allowing the prudent use of reservoir waters for people and agricultural uses, while balancing the fisheries releases The posted reservoir schedule remains in effect, at present, and updates will be posted should the schedule be revised. Please continue to watch for updates.

For immediate release - March 11, 2015

Letter From Congressman Jeff Denham and Congressman Tom McClintock to US Fish & Wildlife, US Bureau of Reclamation and National Oceanic & Atmospheric Administration, addressing New Melones operations and flows.

Power Point presentation from Saturday March 7th, 2015 public meeting

Summary of March 7, 2015 meeting.

As noted during the meeting, Tri-Dam will post weekly updates on this page each Friday, beginning this Friday March 13, 2015. As noted during the meeting, it is important that all interested persons check the website regularly as Tri-Dam will post updates should conditions change, and a drawdown below scheduled operating levels become necessary.

In the event that you have questions, please feel free to contact:
Ms. Susan Larson, slarson@tridamproject.com (209) 785-3838 or
Mr. Ron Berry, rberry@tridamproject.com (209) 965-3996.

Special Notes:

The Tulloch Spring 2015 Fill Schedule is available on the Tulloch page.
Information about the Tulloch Reservoir Shoreline Management Plan is available on the Tulloch page.

Save the Stan
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Data for June 25
Click below for historical data

Elevation (feet above sea level)
3,344.03 Beardsley
4,895.84 Donnells
509.00 Tulloch
Storage (acre feet)
62,717 Beardsley
56,024 Donnells
65,720 Tulloch
Outflow (cubic feet/sec)
Road Conditions
Current road conditions to Beardsley and Donnells Reservoirs can be found on their respective pages.