Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2025
Project	The Dalles
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 31)

Total Number of Fish Observed	132085
Percent of Total Run Analyzed [Number Observed]	100 % [132085]
Temperature Tailrace Exposure Index	20.93 °C
Percent of Fish Exposed [Number Exposed]	96.5 % [127584]
Number of Days Fish Exposed	152

Middle 80% of Run Period (Jul 20 - Oct 13)

Number of Fish Observed	107486
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [107486]
Temperature Tailrace Exposure Index	21.59 °C
Percent of Fish Exposed [Number Exposed]	100 % [107486]
Number of Days Fish Exposed	86

Middle 50% of Run Period (Aug 22 - Sep 28)

Number of Fish Observed	66624
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [66624]
Temperature Tailrace Exposure Index	22.08 °C
Percent of Fish Exposed [Number Exposed]	100 % [66624]
Number of Days Fish Exposed	38

Run Dates

First Day of Run	Mar 1
5% of Run passed	Jul 11
10% of Run passed	Jul 20
50% of Run passed	Sep 14
90% of Run passed	Oct 13
95% of Run passed	Oct 21
Last Day of Run	Dec 31

Date(s) When Temperature Tailrace Crosses 15 °C

May 27

Oct 26