State regulations for the cycling and inspection of spill gates at the dam occur every three years. Over the course of the 2023/2024 Winter, this extraordinary drawdown will occur. 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, 2024, it will remain at that level until January 30, 2024 to provide time for Tri-Dam to conduct the required inspections with State and Federal officials and maintenance. 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.

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 inflows.

DRAWDOWN SCHEDULE FOR TULLOCH RESERVOIR 
2023/2024 OPERATION SCHEDULE

Note: WY 2023/2024 is a deeper drawdown to allow for maintenance work.

Tulloch Reservoir Spring Fill Schedule, as received from the Bureau of Reclamation. Please exercise caution at all times when operating in and around the reservoir, as storm events can result in fluctuations due to storm runoff from streams and hills around the reservoir.

Ordered by: P. Manza

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.

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.

Issued by: P. Manza