Tri-Dam Project

A partnership of the Oakdale and South San Joaquin Irrigation Districts

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October 8, 2015

Anticipated Final Tulloch Reservoir Schedule

Tri-Dam has received additional updated information from the US Bureau of Reclamation (Bureau).  The Bureau advises that the current reservoir level range is likely to be maintained throughout the winter season as noted during our last update of September 21st, 2015.   Tulloch reservoir is currently being operated within the elevation range of  498′ to 501′, which is the normal winter holding elevation.  It is expected that the reservoir will be held within this range for the remainder of the winter season, until the fill schedule is produced in February/March 2016.  It is important to keep in mind however, that heavy rains and excessive runoff could cause Tulloch to rise above this level, if needed, to manage downstream flooding during heavy rain events.

This week’s update from the Bureau notes that the Bureau does not expect any change in the normal winter holding elevation at Tulloch  as noted above due to decreasing atmospheric temperatures, which are decreasing water temperatures downstream of Tulloch both at Goodwin and Orange Blossom.

Should the regulatory agencies determine that additional drawdown is necessary, Tri-Dam will provide immediate notification.  Although the current schedule is expected to remain in effect, it is important to continue to watch for updates and check the website periodically at www.tridamproject.com.

This schedule complies with U.S. Army Corps of Engineers flood control requirements.  The reservoir will generally be managed to the target elevation ranges, but some variation may occur due to large natural inflows or facility and operational constraints.  As always, please exercise care when operating in and around the reservoir.

Article by Tri-Dam Project / Drought Updates, Tulloch Reservoir

Water Data

Data For 03/27/2023

Elevation (feet above sea level)

Donnells 4,768.13

Beardsley 3,368.97

Tulloch 500.62

Storage (acre feet)

Donnells 12,944

Beardsley 78,476

Tulloch 55,975

Outflow (cubic feet/sec)

Donnells 43

Beardsley * 668

Tulloch 1,506


*Spilling

View historical data

News & Updates

Tulloch Spring 2023 Fill Schedule

March 24, 2023 by Tri-Dam Project

Tulloch Winter 2022/2023 Drawdown Schedule

September 8, 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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