Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook Query Parameters

Year	2025
Project	John Day
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 6 - Jul 3)

Total Number of Fish Observed	730
Percent of Total Run Analyzed [Number Observed]	100 % [730]
Temperature Tailrace Exposure Index	12.34 °C
Percent of Fish Exposed [Number Exposed]	5.8 % [43]
Number of Days Fish Exposed	21

Middle 80% of Run Period (Apr 21 - May 22)

Number of Fish Observed	593
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [593]
Temperature Tailrace Exposure Index	12.2 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 26 - May 13)

Number of Fish Observed	381
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [381]
Temperature Tailrace Exposure Index	12.21 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 6
5% of Run passed	Apr 18
10% of Run passed	Apr 21
50% of Run passed	May 2
90% of Run passed	May 22
95% of Run passed	May 28
Last Day of Run	Jul 3

Date(s) When Temperature Tailrace Crosses 15 °C

May 27