Lower Granite Dam Fish Ladder

Fish counts from each fishladder first 2 queries below go back to 1981.

Lower granite dam fish ladder.

The project provides hydroelectric. The adult salmonid trap is located adjacent to the adult fish ladder at lower granite dam on the south shore of the snake river. A complete description of the adult trap and its operation was reported by harmon 2003. 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.

Guided dam tours are available. Travel west on hwy. 2020 steelhead count from july 1 to december 31 2020 to view winter passage at bonneville dam go to. 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.

You can view the fish ladder from outside. Jacks are not included in the count. 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. 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.

Lower granite dam this congressionally authorized project consists of lower granite dam navigation lock powerhouse a fish ladder and associated facilities. When the adult trap is in operation a diversion gate is rotated across the fish ladder to route upstream migrating. 12 toward pomeroy and look for signs to lower granite dam.