Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook Query Parameters

Year	2025
Project	Lower Granite
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 2 - Nov 1)

Total Number of Fish Observed	5353
Percent of Total Run Analyzed [Number Observed]	100 % [5353]
Temperature Tailrace Exposure Index	11.24 °C
Percent of Fish Exposed [Number Exposed]	11.1 % [598]
Number of Days Fish Exposed	30

Middle 80% of Run Period (Apr 2 - Jun 1)

Number of Fish Observed	4409
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [4409]
Temperature Tailrace Exposure Index	10.94 °C
Percent of Fish Exposed [Number Exposed]	3.3 % [148]
Number of Days Fish Exposed	3

Middle 50% of Run Period (Apr 17 - May 10)

Number of Fish Observed	2741
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [2741]
Temperature Tailrace Exposure Index	10.95 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Mar 2
5% of Run passed	Mar 31
10% of Run passed	Apr 2
50% of Run passed	Apr 28
90% of Run passed	Jun 1
95% of Run passed	Jun 13
Last Day of Run	Nov 1

Date(s) When Temperature Tailrace Crosses 15 °C

May 30

Jun 5

Jun 8

Oct 23