Dreamflows Trinity - Lewiston Dam Release Schedule
 
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Releases From Lewiston Dam

In the tables that follow, each date is color-coded according to the kind of release scheduled for that day:

ColorMeaning
 Scheduled release is not yet known.
 Scheduled release: 500 cfs or more below Lewiston Dam all day.
 Ramp up/down from Lewiston during the day.
Note: All scheduled releases based on information provided by U.S. Bureau of Reclamation.

 

April 2025
SunMonTueWedThuFriSat
    1Ramping down
to 1,750 cfs
21,750 cfs
 all day
3Ramping down
to 1,550 cfs
41,550 cfs
 all day
51,500 cfs
 all day
6Ramping down
to 1,350 cfs
71,350 cfs
 all day
8Ramping up
to 4,000 cfs
9Ramping down
to 2,800 cfs
10Ramping down
to 2,400 cfs
11Ramping down
to 2,100 cfs
122,100 cfs
 all day
13Change to
 2,000 cfs at 2am
142,000 cfs
 all day
15Ramping up
to 4,350 cfs
16Ramping up
to 8,500 cfs then
down to 8,250 cfs
17Ramping down
to 7,500 cfs
18Ramping down
to 6,800 cfs
19Ramping down
to 6,000 cfs
20Ramping down
to 5,200 cfs
21Ramping down
to 4,400 cfs
22Ramping down
to 4,000 cfs
23Change to
 3,800 cfs at 8am
243,600 cfs
 all day
253,400 cfs
 all day
263,250 cfs
 all day
273,100 cfs
 all day
282,950 cfs
 all day
292,850 cfs
 all day
302,750 cfs
 all day
     

 

May 2025
SunMonTueWedThuFriSat
        12,700 cfs
 all day
22,600 cfs
 all day
32,500 cfs
 all day
42,400 cfs
 all day
52,300 cfs
 all day
62,200 cfs
 all day
72,150 cfs
 all day
8Ramping down
to 2,050 cfs
92,000 cfs
 all day
101,950 cfs
 all day
111,900 cfs
 all day
121,850 cfs
 all day
131,800 cfs
 all day
141,750 cfs
 all day
151,700 cfs
 all day
161,650 cfs
 all day
171,600 cfs
 all day
181,550 cfs
 all day
191,500 cfs
 all day
201,450 cfs
 all day
211,450 cfs
 all day
221,350 cfs
 all day
231,350 cfs
 all day
241,250 cfs
 all day
251,250 cfs
 all day
261,150 cfs
 all day
271,150 cfs
 all day
281,150 cfs
 all day
29Change to
 1,100 cfs at 2am
301,100 cfs
 all day
311,100 cfs
 all day

 

June 2025
SunMonTueWedThuFriSat
11,050 cfs
 all day
21,050 cfs
 all day
31,050 cfs
 all day
41,000 cfs
 all day
51,000 cfs
 all day
61,000 cfs
 all day
71,000 cfs
 all day
8950 cfs
 all day
9950 cfs
 all day
10950 cfs
 all day
11900 cfs
 all day
12900 cfs
 all day
13900 cfs
 all day
14850 cfs
 all day
15850 cfs
 all day
16850 cfs
 all day
17850 cfs
 all day
18800 cfs
 all day
19800 cfs
 all day
20800 cfs
 all day
21800 cfs
 all day
22750 cfs
 all day
23750 cfs
 all day
24Change to
 700 cfs at 6pm
25700 cfs
 all day
26650 cfs
 all day
27650 cfs
 all day
28650 cfs
 all day
29650 cfs
 all day
30600 cfs
 all day
         

 

July 2025
SunMonTueWedThuFriSat
    1600 cfs
 all day
2600 cfs
 all day
3600 cfs
 all day
4600 cfs
 all day
5600 cfs
 all day
6600 cfs
 all day
7600 cfs
 all day
8Ramping up
to 700 cfs
9Ramping up
to 800 cfs
10Ramping up
to 950 cfs
11Change to
 1,000 cfs at 4pm
121,000 cfs
 all day
131,000 cfs
 all day
14Change to
 900 cfs at noon
15900 cfs
 all day
16850 cfs
 all day
17850 cfs
 all day
18800 cfs
 all day
19800 cfs
 all day
20750 cfs
 all day
21700 cfs
 all day
22650 cfs
 all day
23650 cfs
 all day
24650 cfs
 all day
25650 cfs
 all day
26650 cfs
 all day
27600 cfs
 all day
28600 cfs
 all day
29600 cfs
 all day
30600 cfs
 all day
31Change to
 650 cfs at 6am
   

 

August 2025
SunMonTueWedThuFriSat
          1650 cfs
 all day
2Ramping up
to 1,500 cfs
3Ramping down
to 1,100 cfs
4Ramping down
to 900 cfs
5Ramping down
to 800 cfs
6Change to
 750 cfs at 2pm
7Change to
 700 cfs at 2pm
8700 cfs
 all day
9Change to
 650 cfs at 2am
10650 cfs
 all day
11Change to
 600 cfs at 2am
12600 cfs
 all day
13Change to
 550 cfs at 2am
14550 cfs
 all day
15Change to
 500 cfs at 2am
16500 cfs
 all day
17Change to
 450 cfs at 4am
18
 
19
 
20
 
21
 
22
 
23
 
24
 
25
 
26
 
27
 
28
 
29
 
30
 
31
 
           

Water Management Issues:

1.  Detailed scheduled release information for the next few days is shown on this graph.

2.  The Hoopa Valley Tribe's Boat Dance Ceremony will not be held this year (they are held only in odd-numbered years, typically late August).

3.  Times reflect releases from Lewiston Dam, and it is assumed that it takes approximately 12 hours for the water to get to Pigeon Point and 20 hours to get to Cedar Flat.  This is a good rule of thumb, though the actual flow travel time is flow dependent (the higher the flow, the less time it takes).  Here are some approximate observed numbers:

Lewiston Release Time to Pigeon Point Time to Cedar Flat
500 cfs13 hours24 hours
1000 cfs12 hours20 hours
1500 cfs10 hours14 hours
3000 cfs9 hours13 hours