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.
Lower granite fish count 2016.
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.
They count the fish passing by 50 minutes each hour.
Usace dams video and live counting.
Notes on the dart adult passage dataset.
And installed permanent cooling systems at lower granite dam in 2016 and at little goose dam in 2017.
31 each year are taken by fish counters looking directly into the fishladders.
Day fish counts 4 a m.
Lower granite dam is part of the columbia river basin system of dams built and.
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.
The fish counters have to make collect and read the tapes and then submit their fish counts.
Through tuesday 1 422 steelhead had been counted at lower granite dam on the snake river.
This year s count is among the lowest in the past four decades second only to the 2017 count of 32 237.
Pst each day from april 1 through oct.
Snake river fall chinook saw returns of fewer than 1 000 fish annually from 1975 to 1995.
Two significant new fish.
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.
The walla walla district of the u s.
2020 steelhead count from july 1 to december 31 2020 to view winter passage at bonneville dam go to.
Since then abundance has steadily increased with record counts of over 50 000 fish crossing lower granite dam in 2013 and 2014.
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.
We would like to show you a description here but the site won t allow us.
Jacks are not included in the count.
Fish counting by video tape takes at least a few days to process.
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.
