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Frequently Asked Questions

How do you count fish in the Columbia River?

On April 1, live fish counting resumes at all 8 Columbia River and Snake River Corps dams with fish ladders: from April through October each year for 16 hours each day, fish counters working at each fish ladder look directly into the fish ladders to count the fish passing by.

Why can't I see live fish at Bonneville Dam?

Due to network and cyber security issues, the U.S. Army Corps of Engineers can no longer host live video of fish at Bonneville Dam. Fish counts are available at the Fish Passage Center, DART and StreamNet websites. Day, night, and winter fish counts from 15 Corps fishladders are reported on these pages.

When was the first count of fish taken at the dams?

Fish counting at the dams was started as each dam was put into service: and at Lower Granite in 1975. Portland District publishes the fish counts taken at the dams in annual fish passage reports, as daily, monthly, and yearly count totals of fish migrating upstream through the fishladders at each dam.

What is the passage data for Tumwater dam?

Tumwater Dam: Adult passage data for Tumwater Dam is the combination of released counts, referring to fish passed upstream of the dam and allowed to spawn naturally, and collected counts, referring to fish retained for hatchery broodstock.


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