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 Thu, Oct 22 · yesterdayCurrent

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

Coho · Lower Granite Dam

Well below typical

The run is tapering off

Counted Oct 22

7-day average

Percentile for the date

0th

This run so far

3,671

Passage over the last three days is well below typical for late October (0th percentile) and easing.

3,671 coho have passed Lower Granite this year. In a typical year about 75 percent of the run is through by October 22, and passage peaks around October 12.

On pace for roughly 4,200 to 6,900 fish, against a typical 8,600.

Passage over time

Bars are the day's count at Lower Granite through Oct 22. 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
Fall chinook: over for the year, 23,623 passed Lower Granite against a typical 29,000.Well below typical
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.