Idaho fall chinook

Name: Fall Chinook passage at Lower Granite Dam
Creator: U.S. Army Corps of Engineers

The autumn chinook run, read by the Clearwater and the Snake below Hells Canyon, and the largest chinook count of the year in most seasons.

Builds through August, peaks in September and is mostly past by the end of October. More about the species.

Counts through Sun, Oct 11 · 2 days agoCurrent

The Corps posts each day's count a day late. Next update today around noon Mountain.

Right now

Lower Granite is the last dam below Idaho. Fish counted there are headed for the Snake, Clearwater and Salmon systems.

Fall chinook · Lower Granite Dam

Well below typical

The run is winding down

Counted Oct 11

7-day average

Percentile for the date

0th

This run so far

23,155

Passage over the last three days is well below typical for mid-October (0th percentile).

23,155 fall chinook have passed Lower Granite this year. In a typical year about 94 percent of the run is through by October 11, and passage peaks around September 16.

On pace for roughly 24,000 to 25,000 fish, against a typical 29,000.

Passage over time

Bars are the day's count at Lower Granite through Oct 11. The dashed line is what the date usually brings, the ten-year median.

When they reach this water

Antennas in the water read tagged fish as they swim past. A best guess is our estimate of the peak; fish seen are dates real fish were actually recorded. Each spot below says whether it sits on this river or on a tributary.

No arrival timing for the Fall Chinook yet: no PIT-tag array reads this stretch, so the run status above is Lower Granite Dam's.

Arrival timing from PIT-tag detections via PTAGIS and Columbia River DART; tagged fish are a sample of the run, never a count.

Counts by the U.S. Army Corps of Engineers via Columbia River DART.

The season

When fall chinook usually cross Lower Granite, across the whole run-year, and where this year sits against it.

The dashed line is what the date usually brings at Lower Granite, the ten-year median. The solid line is this run-year so far. Passage usually peaks around Sep 17.

Past seasons

Complete run-years at Lower Granite, newest first. The run-year in progress is left out: a season still being counted is not a season total.

Fall chinook totals by run-year at Lower Granite Dam
Run-year	Counted at Lower Granite
2025	27,618
2024	35,119
2023	47,003
2022	46,174
2021	31,359
2020	24,559
2019	15,778
2018	16,904
2017	26,431
2016	34,715

Where they go in Idaho

The corridor waters whose pages read a fall chinook run.

Right now

The run is winding down

The season

Past seasons

Where they go in Idaho

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The run is winding down