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
Date | Elevation From | Elevation To |
01 Jun to 19 Sep | 506.5 | 509.5 |
20 Sep to 26 Sep | 505 | 508 |
27 Sep to 03 Oct | 503 | 506 |
04 Oct to 10 Oct | 501 | 504 |
11 Oct to 17 Oct | 499 | 502 |
18 Oct to 24 Oct | 497 | 500 |
25 Oct to 31 Oct | 495 | 498 |
01 Nov to 07 Nov | 493 | 496 |
08 Nov to 14 Nov | 491 | 494 |
15 Nov to 21 Nov | 489 | 492 |
22 Nov to 28 Nov | 487 | 490 |
29 Nov to 05 Dec | 485 | 488 |
06 Dec to 12 Dec | 483 | 486 |
13 Dec to 19 Dec | 481 | 484 |
20 Dec to 26 Dec | 479 | 482 |
27 Dec to 02 Jan 2024 | 477 | 480 |
03 Jan to 30 Jan | 475 | 478 |
31 Jan to 06 Feb | 478 | 483 |
07 Feb to 13 Feb | 483 | 488 |
14 Feb to 20 Feb | 488 | 493 |
21 Feb to 27 Feb | 493 | 498 |
Note: WY 2023/2024 is a deeper drawdown to allow for maintenance work.