Idaho summer chinook

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

Chinook counted after the spring run tapers, read by the Salmon River, the Middle Fork and the Snake below Hells Canyon.

Crosses the dam from June, with a tail into August. More about the species.

Counts through Thu, Oct 22 · yesterdayCurrent

The Corps posts each day's count a day late. Next update tomorrow 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.

No salmon or steelhead are moving past Lower Granite right now.

Summer chinook: over for the year, 7,941 passed Lower Granite against a typical 8,900.Season over

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 Summer 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 summer 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 Jun 25.

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.

Summer chinook totals by run-year at Lower Granite Dam
Run-year	Counted at Lower Granite
2025	8,863
2024	11,550
2023	10,319
2022	20,477
2021	5,680
2020	6,749
2019	4,461
2018	7,305
2017	8,952
2016	12,110

Where they go in Idaho

The corridor waters whose pages read a summer chinook run.