Idaho steelhead migration

Every steelhead bound for Idaho passes Lower Granite Dam. This is what the count says today, how it compares with the same date over the last ten years, and when the fish reach each river.

Counts through Thu, Oct 22 · yesterdayCurrent

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

Steelhead 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.

Steelhead · Lower Granite Dam

Well below typical

The run is tapering off

Counted Oct 22

157

7-day average

204

Percentile for the date

0th

This run so far

26,860

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

26,860 steelhead have passed Lower Granite since June 16. In a typical year about 81 percent of the run is through by October 22, and passage peaks around October 4.

On pace for roughly 31,000 to 34,000 fish, against a typical 71,000.

Wild fish: 5,759 so far, about 78 percent of a typical wild run.

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.

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 Steelhead 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.

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 steelhead run.