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 fish count 2016.
This year s count is among the lowest in the past four decades second only to the 2017 count of 32 237.
Jacks are not included in the count.
5 2016 record number of snake river fall chinook spawn in 2015 between lower granite hells canyon dams.
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 adult fish migration upstream.
Day night and winter fish counts from 15 corps fishladders are reported on these pages.
Snake river fall chinook saw returns of fewer than 1 000 fish annually from 1975 to 1995.
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.
Usace dams video and live counting.
The walla walla district of the u s.
From november through march video tape fish counting occurs at us army corps of engineers dams with fish ladders on the columbia and snake rivers.
They count the fish passing by 50 minutes each hour.
31 each year are taken by fish counters looking directly into the fishladders.
Lower granite dam is part of the columbia river basin system of dams built and.
Pst each day from april 1 through oct.
Fish counting by video tape takes at least a few days to process.
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.
And installed permanent cooling systems at lower granite dam in 2016 and at little goose dam in 2017.
Two significant new fish.
The fish counters have to make collect and read the tapes and then submit their fish counts.
Day fish counts 4 a m.
Since then abundance has steadily increased with record counts of over 50 000 fish crossing lower granite dam in 2013 and 2014.
We would like to show you a description here but the site won t allow us.
Through tuesday 1 422 steelhead had been counted at lower granite dam on the snake river.
Army corps of engineers is improving both adult and juvenile fish passage at lower granite lock and dam to help endangered salmon and steelhead migrate in the lower snake river.
