Lower Granite Fish Facility

Since 1975 adult salmon primarily chinook and steelhead have been trapped and sampled at lower granite dam on the snake river located in southeast washington.

Lower granite fish facility.

Lower granite dam located 695 river kilometers from the mouth of the columbia river is the farthest upstream dam on the snake river with adult fish passage facilities. Bonneville the dalles john day and mcnary on the columbia river. Opened 45 years ago in 1975 the dam is located 22 miles 35 km south of colfax and 35 miles 56 km north of pomeroy. If the water temperature is 65 degrees at lower granite dam and it s 62 degrees at bonneville dam then over the course of the trip we will slowly drop the temperature to 62 degrees before we release them.

Transporting helps increase fish survivability by putting them on a more natural calendar and helps them bypass potential predators. The features that will be upgraded are expected to increase fish survival by providing more efficient control of flow improving the removal and passage of. The project provides hydroelectric generation navigation recreation and incidental irrigation. Lower granite dam this congressionally authorized project consists of lower granite dam navigation lock powerhouse a fish ladder and associated facilities.

That will happen again this year. Passage routes operated for downstream migrating fish are the spillway a spillway weir and a juvenile bypass system. Lower granite lock and dam is a concrete gravity run of the river dam in the northwest united states on the lower snake river in southeastern washington it bridges whitman and garfield counties. 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.

2020 steelhead count from july 1 to december 31 2020 to view winter passage at bonneville dam go to. Since its completion in 1975 adult salmonids have been collected and sampled at lower granite dam using an adult trap built adjacent to the turnpool of the adult. Lower granite dam is part of the columbia river basin system of dams built and. 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.

A lot of work and research goes on at lower granite dam so we will be giving updates throughout the year to help you understand some of the work we are doing and what we are learning. Ice harbor lower monumental little goose and lower granite on the snake river. Fish counts are estimates of the actual.