Keyword Analysis & Research: columbia river dams fish ladder counts


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Frequently Asked Questions

What was the purpose of the fish ladder at Bonneville Dam?

A "collecting system" was installed at Bonneville Dam to encourage the fish towards the ladders and locks. Auxiliary water could be released by a conduit system which increased the flow at the entrance to that of a fair-sized river. Penny Postcard: Bonneville Dam fish ladders, north side, ca.1940s.

What is the history of fishladder counts in Portland?

Fish counts from each fishladder (first 2 queries below) go back to 1981. In Portland District annual fish passage reports fishladder counts are combined to get the counts for each dam (Bonneville, The Dalles, John Day, McNary, Ice Harbor, and Lower Monumental each have 2 fishladders).

Where can I find daily salmonid passage index and collection counts?

Daily salmonid passage index and collection counts at sites throughout the Columbia Basin. Sites include dams and river traps along the Salmon, Snake, Columbia, Imnaha and Grande Ronde rivers. The Graphics & Text query joins the PIT Tag dataset with the River Environment dataset.

How many lamprey have been trapped at Rock Island Dam?

The total lamprey passage for Rock Island Dam, with the translocated fish included, is 1,186 lamprey. The total lamprey passage for Rocky Reach Dam, with the translocated fish included, is 1,148 lamprey. In 2020, Grant County PUD trapped 354 adult lamprey at Priest Rapids Dam.


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