Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook Query Parameters

Year	2025
Project	Ice Harbor
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 4 - Jun 28)

Total Number of Fish Observed	227
Percent of Total Run Analyzed [Number Observed]	100 % [227]
Temperature Tailrace Exposure Index	11.87 °C
Percent of Fish Exposed [Number Exposed]	5.7 % [13]
Number of Days Fish Exposed	9

Middle 80% of Run Period (Apr 12 - May 19)

Number of Fish Observed	187
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [187]
Temperature Tailrace Exposure Index	11.59 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 18 - May 7)

Number of Fish Observed	120
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [120]
Temperature Tailrace Exposure Index	11.53 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 4
5% of Run passed	Apr 11
10% of Run passed	Apr 12
50% of Run passed	Apr 25
90% of Run passed	May 19
95% of Run passed	Jun 12
Last Day of Run	Jun 28

Date(s) When Temperature Tailrace Crosses 15 °C

May 31