Lower Granite Dam Fish Ladder

At lower granite lock and dam s adult fish ladder longer duration elevated water temperatures began to form a thermal barrier to upstream migrating salmon and steelhead slowing and or stopping. Lower granite dam this congressionally authorized project consists of lower granite dam navigation lock powerhouse a fish ladder and associated facilities. 12 toward pomeroy and look for signs to lower granite dam.

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Lower granite dam fish ladder.

Guided dam tours are available. The project provides hydroelectric. Corps of engineers fish reporting site dam date of count daily count total to date in 2020 total to date in 2019 5 year average total count to date bonneville oct 1 446 104 286 66 091 132 844 lower granite oct 1 1 623 28 838 12 500 33 485 counts include wild and hatchery origin fish. Jacks are not included in the count.

When the adult trap is in operation a diversion gate is rotated across the fish ladder to route upstream migrating. Lower granite dam has one fish ladder with entrances on both shores to provide a passage route for upstream migrating fish including adult salmon and steelhead lamprey shad and others. Lower granite dam is the most upstream dam in the snake river system that has a fish ladder to allow adult salmon and steelhead to migrate upstream. You can view the fish ladder from outside.

A complete description of the adult trap and its operation was reported by harmon 2003. Fish counts from each fishladder first 2 queries below go back to 1981. 2020 adult chinook salmon count from august 1 to december 15 2020 dam date of count daily adult count total to date in 2020 total to date in 2019 5 year average total count to date bonneville oct 1 2 321 362 520 249 906 400 704 lower granite oct 1 154 22 703 13 335 26 210 counts include both hatchery and wild origin adults. The visitor center is open 8 30 am to 5 pm monday through saturday and has a fish ladder viewing point where you can see the fish go through the ladder under water.

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. 2020 steelhead count from july 1 to december 31 2020 to view winter passage at bonneville dam go to. The adult salmonid trap is located adjacent to the adult fish ladder at lower granite dam on the south shore of the snake river.

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