CHANGE ORDER ISSUED- Flows to Increase at Lewiston Dam

[Abel, Kiana]

For Release: Dec. 22, 2025

Contact: Kiana Abel, Public Affairs Specialist, ja...@usbr.gov, (530) 623-1804

CHANGE ORDER ISSUED- Flows to Increase at Lewiston Dam

The Bureau of Reclamation - Central Valley Operations has approved the Trinity River Restoration Program's request to raise river flows on the Trinity River from Lewiston Dam.

Please expect the following: 

• Flows will increase from 300 cfs on Wednesday, Dec. 24, 2025 at 4 a.m.
• The peak of 6500 cfs will commence on Thursday, Dec. 25, 2025  at 8 p.m.
• At 10pm, Thursday, Dec. 25, 2025 Flows from Lewiston Dam will decrease to 6350 cfs
• After Thursday, a steady decrease of flow will commence reaching 2000 cfs on Wednesay, Dec. 31 at 10 a.m.
• 300 cfs baseflow at 12:01 a.m. on Monday, Jan. 12, 2026.

The purpose of a synchronized flow is to use the power of a winter storm to maintain and form river complexity. By combining dam releases with a storm event, mainstem flows help to reduce the impact of sediment deposited from tributaries like Deadwood Creek in Lewiston and recondition the riverbed for prime salmonid habitat and food production.

Recreating along the Trinity River is not advised until the storm passes and flows recede. If you live along the river (or any tributaries), please make sure to move items from the river's edge.

Ways to Stay Informed

• Trinity Releases Email Sign-Up: http://groups.google.com/group/trinity-releases/boxsubscribe
• To follow river levels via CNFRC: https://www.cnrfc.noaa.gov/graphicalRVF.php?id=TRNC1
• To follow the storm via National Weather Service, click here: NWS Radar
• Follow Trinity River Restoration Program on Facebook
• Trinity River Restoration Program Contact: in...@trrp.net or 530-623-1800

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From: Patton, Thomas K <tpa...@usbr.gov>
Sent: Monday, December 22, 2025 10:26 AM
Subject: Change Order - Lewiston Dam

 

Please make the following release changes to the Trinity River.

Date	Time	From (cfs)	To (cfs)
12/24/2025	0400	300	350
	0800	350	450
	1000	450	600
	1400	600	850
	1600	850	1100
	1800	1100	1350
	2200	1350	1600
12/25/2025	0001	1600	1850
	0200	1850	2100
	0400	2100	2600
	0600	2600	3100
	0800	3100	3600
	1000	3600	4100
	1200	4100	4600
	1400	4600	5100
	1600	5100	5600
	1800	5600	6100
	2000	6100	6500
	2200	6500	6350
12/26/2025	0200	6350	6200
	0600	6200	6050
	1000	6050	5900
	1400	5900	5750
	1800	5750	5500
	2200	5500	5300
12/27/2025	0200	5300	5150
	0600	5150	5000
	1000	5000	4800
	1400	4800	4600
	1800	4600	4400
	2200	4400	4200
12/28/2025	0200	4200	4050
	0600	4050	3900
	1000	3900	3800
	1400	3800	3700
	1800	3700	3600
	2200	3600	3450
12/29/2025	0200	3450	3300
	0600	3300	3150
	1000	3150	3000
	1400	3000	2900
	1800	2900	2800
	2200	2800	2700
12/30/2025	0200	2700	2600
	0600	2600	2500
	1200	2500	2400
	1800	2400	2300
12/31/2025	0001	2300	2200
	0400	2200	2100
	1000	2100	2000
	1600	2000	1900
	2200	1900	1800
1/1/2026	0400	1800	1700
	1200	1700	1600
	2000	1600	1500
1/2/2026	0600	1500	1400
	1600	1400	1300
1/3/2026	0200	1300	1200
	1200	1200	1100
	2200	1100	1000
1/4/2026	1200	1000	900
1/5/2026	0400	900	800
1/6/2026	0001	800	700
	1600	700	600
1/7/2026	1800	600	500
1/9/2026	0001	500	450
1/10/2026	0001	450	400
1/11/2026	0200	400	350
1/12/2026	0001	350	300

 

Comment:  Winter Synchronization flow

Issued by: Tom Patton