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Bonneville Dam — Summer Chinook

Chinook salmon · Dam ladder count · Columbia River mile 146

2026 season — final

58,510

Chinook salmon past the dam in 2026

The 2026 Bonneville Dam summer chinook finished at 58,510 adult fish past the dam — 26% below the 10-year average final of 79,319 (mean of 10 seasons, 2016–2025); the preseason forecast for the run was 40,700, and passage finished at 144% of that forecast (a run forecast is not a goal for this count).

Preseason forecast 40,700 — a run forecast, not a goal for this count

Season summary

The 2026 season, finished — compare it with earlier years. Toggle seasons, flip between daily counts and the cumulative run, and overlay the 10-year average and the preseason forecast.

Cumulative count vs the 10-year average

23,14846,29669,44392,591AprMayJunJulAugSepOct

2026 final run  10-year average (mean of 2016–2025)  Middle half of seasons

Daily counts, 2026

Peak Jun 16 — 1,767AprMayJunJulAugSepOct
Daily count table
DateCountCumulative
Apr 0100
Apr 0200
Apr 0300
Apr 0400
Apr 0500
Apr 0600
Apr 0700
Apr 0800
Apr 0900
Apr 1000
Apr 1100
Apr 1200
Apr 1300
Apr 1400
Apr 1500
Apr 1600
Apr 1700
Apr 1800
Apr 1900
Apr 2000
Apr 2100
Apr 2200
Apr 2300
Apr 2400
Apr 2500
Apr 2600
Apr 2700
Apr 2800
Apr 2900
Apr 3000
May 0100
May 0200
May 0300
May 0400
May 0500
May 0600
May 0700
May 0800
May 0900
May 1000
May 1100
May 1200
May 1300
May 1400
May 1500
May 1600
May 1700
May 1800
May 1900
May 2000
May 2100
May 2200
May 2300
May 2400
May 2500
May 2600
May 2700
May 2800
May 2900
May 3000
May 3100
Jun 01686686
Jun 021,1401,826
Jun 031,1632,989
Jun 041,1134,102
Jun 051,1815,283
Jun 069746,257
Jun 071,5387,795
Jun 081,2018,996
Jun 091,33210,328
Jun 101,29711,625
Jun 111,66513,290
Jun 121,19814,488
Jun 131,33015,818
Jun 141,26217,080
Jun 151,70418,784
Jun 161,76720,551
Jun 171,21521,766
Jun 181,18622,952
Jun 191,42024,372
Jun 201,60725,979
Jun 211,57127,550
Jun 221,47229,022
Jun 231,44730,469
Jun 241,46931,938
Jun 251,66133,599
Jun 261,59735,196
Jun 271,41236,608
Jun 281,20137,809
Jun 291,05038,859
Jun 301,34440,203
Jul 0196041,163
Jul 0296142,124
Jul 0394243,066
Jul 041,11544,181
Jul 051,07545,256
Jul 0693546,191
Jul 071,10647,297
Jul 081,07548,372
Jul 0988949,261
Jul 1062449,885
Jul 1157850,463
Jul 1252550,988
Jul 1342051,408
Jul 1443251,840
Jul 1536452,204
Jul 1642752,631
Jul 1735052,981
Jul 1834553,326
Jul 1934453,670
Jul 2035554,025
Jul 2142654,451
Jul 2241354,864
Jul 2341755,281
Jul 2445655,737
Jul 2539256,129
Jul 2620856,337
Jul 2721356,550
Jul 2824356,793
Jul 2948657,279
Jul 3065357,932
Jul 3157858,510
Aug 01058,510
Aug 02058,510
Aug 03058,510
Aug 04058,510
Aug 05058,510
Aug 06058,510
Aug 07058,510
Aug 08058,510
Aug 09058,510
Aug 10058,510
Aug 11058,510
Aug 12058,510
Aug 13058,510
Aug 14058,510
Aug 15058,510
Aug 16058,510
Aug 17058,510
Aug 18058,510
Aug 19058,510
Aug 20058,510
Aug 21058,510
Aug 22058,510
Aug 23058,510
Aug 24058,510
Aug 25058,510
Aug 26058,510
Aug 27058,510
Aug 28058,510
Aug 29058,510
Aug 30058,510
Aug 31058,510
Sep 01058,510
Sep 02058,510
Sep 03058,510
Sep 04058,510
Sep 05058,510
Sep 06058,510
Sep 07058,510
Sep 08058,510
Sep 09058,510
Sep 10058,510
Sep 11058,510
Sep 12058,510
Sep 13058,510
Sep 14058,510
Sep 15058,510
Sep 16058,510
Sep 17058,510
Sep 18058,510
Sep 19058,510
Sep 20058,510
Sep 21058,510
Sep 22058,510
Sep 23058,510
Sep 24058,510
Sep 25058,510
Sep 26058,510
Sep 27058,510
Sep 28058,510
Sep 29058,510
Sep 30058,510
Oct 01058,510
Oct 02058,510
Oct 03058,510
Oct 04058,510
Oct 05058,510
Oct 06058,510
Oct 07058,510
Oct 08058,510
Oct 09058,510
Oct 10058,510
Oct 11058,510
Oct 12058,510
Oct 13058,510
Oct 14058,510
Oct 15058,510
Oct 16058,510
Oct 17058,510
Oct 18058,510
Oct 19058,510
Oct 20058,510
Oct 21058,510
Oct 22058,510
Oct 23058,510
Oct 24058,510
Oct 25058,510
Oct 26058,510
Oct 27058,510
Oct 28058,510
Oct 29058,510
Oct 30058,510
Oct 31058,510

Preseason forecast

The 2026 preseason forecast was 40,700 upper Columbia summer Chinook. It is a run forecast, not a dam goal.

2026 preseason forecast, Joint Staff Report (WDFW / ODFW / CRITFC), via ODFW's Columbia River forecast table.

Final passage at this counter: 58,510 — 144% of the forecast. For scale, the 2016–2025 average final is 79,319.

Final counts by year

YearFinal countvs 10-yr avg
202658,510below average
202568,445below average
202461,191below average
202379,259below average
2022101,429above average
202174,944below average
202088,182above average
201951,050below average
201861,057below average
201788,044above average
2016119,591above average

About this count

How it is counted: Dam ladder count at Columbia River mile 146.

Dam day counts are expanded estimates: counters watch the ladders 16 hours a day, 50 minutes of every hour, and the day count is that tally multiplied by 1.2. Fish passing at night, through the navigation lock or through turbines are not counted. The Corps reviews counts with video after the season and occasionally revises them.

Counts post daily in season; in-season figures are preliminary, and the Corps reviews the season after it closes — the figures here are the final published ones. Source: Fish Passage Center — Adult Data Query (U.S. Army Corps of Engineers counts).