Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook 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 (Mar 24 - Dec 15)

Total Number of Fish Observed	1223
Percent of Total Run Analyzed [Number Observed]	100 % [1223]
Temperature Tailrace Exposure Index	11.82 °C
Percent of Fish Exposed [Number Exposed]	5.6 % [69]
Number of Days Fish Exposed	28

Middle 80% of Run Period (Apr 17 - May 22)

Number of Fish Observed	989
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [989]
Temperature Tailrace Exposure Index	11.69 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 24 - May 12)

Number of Fish Observed	654
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [654]
Temperature Tailrace Exposure Index	11.73 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Mar 24
5% of Run passed	Apr 11
10% of Run passed	Apr 17
50% of Run passed	May 1
90% of Run passed	May 22
95% of Run passed	May 30
Last Day of Run	Dec 15

Date(s) When Temperature Tailrace Crosses 15 °C

May 28

Oct 24