Idaho salmon migration

Spring, summer and fall chinook, plus sockeye and coho, counted at Lower Granite Dam and tracked up the Clearwater, Salmon and Snake systems.

Counts through Sun, Oct 11 · 2 days agoCurrent

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

Salmon runs at Lower Granite Dam

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.

Coho · Lower Granite Dam

Below typical

The run is at its peak

Counted Oct 11

7-day average

Percentile for the date

19th

This run so far

2,965

Passage over the last three days is below typical for mid-October (19th percentile) and rising.

2,965 coho have passed Lower Granite this year. In a typical year about 52 percent of the run is through by October 11, and passage peaks around October 12.

On pace for roughly 4,100 to 11,000 fish, against a typical 8,600.

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.

Spring chinook: over for the year, 28,119 passed Lower Granite against a typical 37,000.Season over
Summer chinook: over for the year, 7,941 passed Lower Granite against a typical 8,900.Season over
Sockeye: over for the year, 221 passed Lower Granite against a typical 730.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 Salmon 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.

Each run in depth

Spring Chinook
Crosses the dam through May and is mostly past by the end of June.
Summer Chinook
Crosses the dam from June, with a tail into August.
Fall Chinook
Builds through August, peaks in September and is mostly past by the end of October.
Sockeye
Crosses the dam through July, with the count usually complete by the end of August.
Coho
Crosses the dam from September, peaks in October and runs into November.

Where they go in Idaho

Every water above the dam sees the whole run passing its mouth. These are the rivers whose pages read a salmon run.

Salmon runs at Lower Granite Dam

The run is winding down

The run is at its peak

Each run in depth

Where they go in Idaho

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The run is winding down

The run is at its peak