Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook Query Parameters

Year	2025
Project	Little Goose
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 28 - Jun 30)

Total Number of Fish Observed	1219
Percent of Total Run Analyzed [Number Observed]	100 % [1219]
Temperature Tailrace Exposure Index	10.9 °C
Percent of Fish Exposed [Number Exposed]	1.5 % [19]
Number of Days Fish Exposed	16

Middle 80% of Run Period (Apr 13 - May 14)

Number of Fish Observed	983
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [983]
Temperature Tailrace Exposure Index	10.96 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 20 - May 4)

Number of Fish Observed	662
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [662]
Temperature Tailrace Exposure Index	10.71 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Mar 28
5% of Run passed	Apr 5
10% of Run passed	Apr 13
50% of Run passed	Apr 24
90% of Run passed	May 14
95% of Run passed	May 19
Last Day of Run	Jun 30

Date(s) When Temperature Tailrace Crosses 15 °C

May 30