Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2025
Project	Lower Granite
River Parameter	Temperature Tailrace
Critical Temperature Tailrace Value	15 °C
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	1/1 - 12/31

Total Run Period (Mar 1 - Dec 30)

Total Number of Fish Observed	82671
Percent of Total Run Analyzed [Number Observed]	100 % [82671]
Temperature Tailrace Exposure Index	17.11 °C
Percent of Fish Exposed [Number Exposed]	78.4 % [64884]
Number of Days Fish Exposed	137

Middle 80% of Run Period (Sep 9 - Oct 31)

Number of Fish Observed	66713
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [66713]
Temperature Tailrace Exposure Index	18.29 °C
Percent of Fish Exposed [Number Exposed]	90.2 % [60220]
Number of Days Fish Exposed	44

Middle 50% of Run Period (Sep 25 - Oct 17)

Number of Fish Observed	43296
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [43296]
Temperature Tailrace Exposure Index	18.77 °C
Percent of Fish Exposed [Number Exposed]	100 % [43296]
Number of Days Fish Exposed	23

Run Dates

First Day of Run	Mar 1
5% of Run passed	Jul 15
10% of Run passed	Sep 9
50% of Run passed	Oct 5
90% of Run passed	Oct 31
95% of Run passed	Nov 15
Last Day of Run	Dec 30

Date(s) When Temperature Tailrace Crosses 15 °C

May 30

Jun 5

Jun 8

Oct 23