That update typically occurs in late may, when substantial numbers of upriver spring chinook have crossed bonneville dam. Passage at bonneville is usually 50 percent. The 2023 lrh return was 87,127 adults, 113% of forecast.
Bonneville Dam Fish Count A Deep Dive Into The Annual Migration
A computation of bonneville dam steelhead run numbers in the columbia riverby:
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One key finding is the measurement of total salmon and steelhead run size in the basin that calculates current and historical estimates of ocean harvest, returns to the mouth of. A record number of anglers fishing for white sturgeon in the bonneville dam pool shot through the harvest guideline of 675 fish in record time on new year’s day, resulting in the immediate. At five of the eight dams (bonneville, the dalles, john day, mcnary and lower granite), counts are collected for 8 hours at night for a portion of the year; The tested fish counter must score within 95% of the counts.
The data presented last week gives a more complete picture of salmon and steelhead returns in the basin, showing current and historical estimates of proportions of. To address this gap, we assembled a vast database of survival and other data for eight wild populations of threatened chinook salmon (o. Mark bachmann the numbers used here were/are compiled by the bonneville power. A record number of threatened chum salmon passed bonneville dam late in 2024, with over 1,100 of the salmon passing the dam on their way upstream, the largest passage by chum at the.
During this test, both the tested fish counter and the fish count supervisor each count each species passing for one hour.
Information on numbers of fish crossing the columbia and snake river dams is taken from data posted by the united states army corps of engineers, and is updated during. • tac met on september and reviewed chinook and steelhead passage at bonneville dam 25 and associated sampling data along with chinook harvest data from lower.
