Tri-Dam Project

A partnership of the Oakdale and South San Joaquin Irrigation Districts

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September 8, 2022

Tulloch Winter 2022/2023 Drawdown Schedule

The fall drawdown schedule for Tulloch Reservoir is provided below. This schedule complies with U.S. Army Corps of Engineers flood control requirements. The reservoir will generally be managed to the target elevation range, however some variation may occur due to large local inflow during rain events or facility and operational constraints.

DateElevation FromElevation To
01 Jun to 19 Sep506.5509.5
20 Sep to 26 Sep505508
27 Sep to 03 Oct503.5507
04 Oct to 10 Oct502506
11 Oct to 17 Oct501505
18 Oct to 24 Oct500504
25 Oct to 31 Oct499503
01 Nov to 20 Mar498501.6

 

Article by Tri-Dam Project / Fill Schedule, Tulloch Reservoir

March 10, 2022

Tulloch Spring 2022 Fill Schedule

From: Bureau of Reclamation

2022 Tulloch Spring Fill will follow the typical spring fill procedures, which follow the USACE flood control curve upward. During the spring fill, the reservoir will be managed to the given target elevation ranges as much as possible. Some variations may still occur due to large natural inflows or facility and operational constraints.

Date
From
Date
Through
Elevation
Low
Elevation
High
3/17/20223/22/2022498.6501.6
3/23/20223/29/2022499.4502.4
3/30/20224/05/2022500.1503.1
4/06/20224/12/2022500.9503.9
4/13/20224/19/2022501.7504.7
4/20/20224/26/2022502.4505.4
4/27/20225/03/2022503.2506.2
5/04/20225/10/2022504.0507.0
5/11/20225/17/2022505.5508.5
5/18/20225/24/2022506.5509.5
5/25/20229/15/2022506.5509.5

Issued by: P. Manza

Article by Tri-Dam Project / Fill Schedule, Tulloch Reservoir

September 20, 2021

Tulloch Winter 2021/2022 Drawdown Schedule

The fall drawdown schedule for Tulloch Reservoir is provided below. This schedule complies with U.S. Army Corps of Engineers flood control requirements. The reservoir will generally be managed to the target elevation range, however some variation may occur due to large local inflow during rain events or facility and operational constraints.

DateElevation FromElevation To
01 Jun to 21 Sep506.5509.5
24 Sep to 27 Sep504508
28 Sep to 04 Oct503507
05 Oct to 10 Oct500.0503.0
11 Oct to 17 Oct501505
18 Oct to 23 Oct500504
24 Oct to 31 Oct499503
01 Nov to 19 Mar498501.6

 

Article by Tri-Dam Project / Fill Schedule, Tulloch Reservoir

March 15, 2021

Tulloch Spring 2021 Fill Schedule

From: Bureau of Reclamation

2021 Tulloch Spring Fill will follow the typical spring fill procedures, which follow the USACE flood control curve upward. During the spring fill, the reservoir will be managed to the given target elevation ranges as much as possible. Some variations may still occur due to large natural inflows or facility and operational constraints.

Date
From
Date
Through
Elevation
Low
Elevation
High
3/17/20213/22/2020498.6501.6
3/23/20213/29/2021499.4502.4
3/30/20214/05/2021500.1503.1
4/06/20214/12/2021500.9503.9
4/13/20214/19/2021501.7504.7
4/20/20214/26/2021502.4505.4
4/27/20215/03/2021503.2506.2
5/04/20215/10/2021504.0507.0
5/11/20205/17/2020505.5508.5
5/18/20215/24/2021506.5509.5
5/25/20219/15/2021506.5509.5

Issued by: P. Manza

The reservoir schedule for Tulloch Reservoir is prepared by the Bureau of Reclamation (BOR). The BOR operates New Melones and generates power at the power house directly upstream from Tulloch Reservoir. Although Tri-Dam and the BOR work to stay within the posted range, there are many factors that can cause reservoir levels to periodically be “out of range”. Such factors include power generation equipment availability, electric grid management, mandated and emergency river releases for fisheries and other environmental factors. When this occurs, both Tri-Dam and the BOR work to jointly manage reservoir operations at Tulloch and New Melones to get back into the posted range as quickly as safely possible. For this reason, we again remind residents and others that the reservoir levels are subject to change daily and seasonally, thus it is necessary to monitor facilities daily particularly during the spring fill and winter drawdown.

Article by Tri-Dam Project / Fill Schedule, Tulloch Reservoir

July 29, 2020

Tulloch Winter 2020/2021 Drawdown Schedule

Updated: 9/28/20

State regulations for the cycling and inspection of gates at the dam have changed from every five years to every three years. In our effort to be fully compliant and ensure the utmost safety of our facilities, Tri-Dam will transition to a three year schedule this winter. The drawdown schedule has been coordinated with the United States Bureau of Reclamation (USBR), and will be implemented as shown. The schedule follows the general pattern used in past extraordinary drawdown years. Please note that once the reservoir is down to 475’ by January 3, 2021 , it will remain at that level until January 9, 2021 to provide time for Tri-Dam to conduct the required inspections with State and Federal officials. After that occurs, USBR will slowly begin the fill schedule. An additional schedule will be produced by the USBR, and that will be distributed by Tri-Dam immediately upon receipt.

As always, the published schedule is subject to change in the event of weather events and other operational factors, thus we encourage all persons to exercise caution when operating in an around the reservoir.

DateElevation LowElevation High
9/30/2020505.9508.9
10/4/2020503.9506.9
10/7/2020502.0505.0
10/10/2020500.0503.0
10/14/2020498.0501.0
10/21/2020496.0499.0
10/28/2020494.0497.0
11/1/2020492.9495.9
11/2/2020492.6495.6
11/3/2020492.3495.3
11/4/2020492.0495.0
11/5/2020491.7494.7
11/6/2020491.5494.5
11/7/2020491.2494.2
11/8/2020490.9493.9
11/9/2020490.6493.6
11/10/2020490.3493.3
11/11/2020490.0493.0
11/12/2020489.8492.8
11/13/2020489.5492.5
11/14/2020489.2492.2
11/15/2020488.9491.9
11/16/2020488.6491.6
11/17/2020488.3491.3
11/18/2020488.1491.1
11/19/2020487.8490.8
11/20/2020487.5490.5
11/21/2020487.2490.2
11/22/2020486.9489.9
11/23/2020486.6489.6
11/24/2020486.4489.4
11/25/2020486.1489.1
11/26/2020485.8488.8
11/27/2020485.5488.5
11/28/2020485.2488.2
11/29/2020484.9487.9
11/30/2020484.6487.6
12/1/2020484.4487.4
12/2/2020484.1487.1
12/3/2020483.8486.8
12/4/2020483.5486.5
12/5/2020483.2486.2
12/6/2020482.9485.9
12/7/2020482.7485.7
12/8/2020482.4485.4
12/9/2020482.1485.1
12/10/2020481.8484.8
12/11/2020481.5484.5
12/12/2020481.2484.2
12/13/2020481.0484.0
12/14/2020480.7483.7
12/15/2020480.4483.4
12/16/2020480.1483.1
12/17/2020479.8482.8
12/18/2020479.5482.5
12/19/2020479.3482.3
12/20/2020479.0482.0
12/21/2020478.7481.7
12/22/2020478.4481.4
12/23/2020478.1481.1
12/24/2020477.8480.8
12/25/2020477.6480.6
12/26/2020477.3480.3
12/27/2020477.0480.0
12/28/2020476.7479.7
12/29/2020476.4479.4
12/30/2020476.1479.1
12/31/2020475.9478.9
1/1/2021475.6478.6
1/2/2021475.3478.3
1/3/2021475.0478.0
1/4/2021475.0478.0
1/5/2021475.0478.0
1/6/2021475.0478.0
1/7/2021475.0478.0
1/8/2021475.0478.0
1/9/2021475.0478.0
1/10/2021475.0478.0
1/11/2021475.6478.6
1/12/2021476.2479.2
1/13/2021476.8479.8
1/14/2021477.4480.4
1/15/2021478.0481.0
1/16/2021478.6481.6
1/17/2021479.2482.2
1/18/2021479.8482.8
1/19/2021480.4483.4
1/20/2021481.0484.0
1/21/2021481.6484.6
1/22/2021482.2485.2
1/23/2021482.8485.8
1/24/2021483.4486.4
1/25/2021484.0487.0
1/26/2021484.6487.6
1/27/2021485.2488.2
1/28/2021485.8488.8
1/29/2021486.4489.4
1/30/2021487.0490.0
1/31/2021487.6490.6
2/1/2021488.2491.2
2/2/2021488.8491.8
2/3/2021489.4492.4
2/4/2021490.0493.0
2/5/2021490.6493.6
2/6/2021491.2494.2
2/7/2021491.8494.8
2/8/2021492.4495.4
2/9/2021493.0496.0
2/10/2021493.6496.6
2/11/2021494.2497.2
2/12/2021494.8497.8
2/13/2021495.4498.4
2/14/2021496.0499.0
2/15/2021496.6499.6
2/16/2021497.2500.2
2/17/2021497.8500.8
2/18/2021498.4501.4
2/19/2021498.6501.6
3/22/2021498.6501.6

 

Article by Tri-Dam Project / Fill Schedule, Tulloch Reservoir

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News & Updates

Tulloch Winter 2022/2023 Drawdown Schedule

September 8, 2022 by Tri-Dam Project

Tulloch 2022 Internal Guidance Memo—Grandfathered Facilities

April 22, 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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