Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2025
Project	McNary
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 (Apr 1 - Oct 31)

Total Number of Fish Observed	93313
Percent of Total Run Analyzed [Number Observed]	100 % [93313]
Temperature Tailrace Exposure Index	19.66 °C
Percent of Fish Exposed [Number Exposed]	95.4 % [89043]
Number of Days Fish Exposed	145

Middle 80% of Run Period (Aug 10 - Oct 18)

Number of Fish Observed	76443
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [76443]
Temperature Tailrace Exposure Index	20.01 °C
Percent of Fish Exposed [Number Exposed]	100 % [76443]
Number of Days Fish Exposed	70

Middle 50% of Run Period (Sep 17 - Oct 8)

Number of Fish Observed	47667
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [47667]
Temperature Tailrace Exposure Index	20.36 °C
Percent of Fish Exposed [Number Exposed]	100 % [47667]
Number of Days Fish Exposed	22

Run Dates

First Day of Run	Apr 1
5% of Run passed	Jul 19
10% of Run passed	Aug 10
50% of Run passed	Sep 27
90% of Run passed	Oct 18
95% of Run passed	Oct 23
Last Day of Run	Oct 31

Date(s) When Temperature Tailrace Crosses 15 °C

May 28

Oct 24