[env-trinity] CHANGE ORDER ISSUED- Flows to Increase at Lewiston Dam

[Abel, Kiana]

[cid:d6ab7f67-653d-4e09-987f-c6fae3f6613f]

For Release: Dec. 22, 2025
Contact: Kiana Abel, Public Affairs Specialist, jabel at 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<https://radar.weather.gov/?settings=v1_eyJhZ2VuZGEiOnsiaWQiOiJsb2NhbCIsImNlbnRlciI6Wy0xMjMuNjc5LDQwLjQ3OV0sImxvY2F0aW9uIjpudWxsLCJ6b29tIjo3Ljc4ODQyMzY4NTg1NDg0LCJmaWx0ZXIiOiJXU1ItODhEIiwibGF5ZXIiOiJzcl9icmVmIiwic3RhdGlvbiI6IktCSFgifSwiYW5pbWF0aW5nIjp0cnVlLCJiYXNlIjoic3RhbmRhcmQiLCJhcnRjYyI6ZmFsc2UsImNvdW50eSI6ZmFsc2UsImN3YSI6ZmFsc2UsInJmYyI6ZmFsc2UsInN0YXRlIjpmYWxzZSwibWVudSI6dHJ1ZSwic2hvcnRGdXNlZE9ubHkiOnRydWUsIm9wYWNpdHkiOnsiYWxlcnRzIjowLjgsImxvY2FsIjowLjYsImxvY2FsU3RhdGlvbnMiOjAuOCwibmF0aW9uYWwiOjAuNn19>
  *
Follow Trinity River Restoration Program on Facebook<https://www.facebook.com/trinityriverrestoration/>
  *
Trinity River Restoration Program Contact: info at trrp.net or 530-623-1800

________________________________
From: Patton, Thomas K <tpatton at 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
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