Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead 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 12 - Dec 27)

Total Number of Fish Observed	7717
Percent of Total Run Analyzed [Number Observed]	100 % [7717]
Temperature Tailrace Exposure Index	11.87 °C
Percent of Fish Exposed [Number Exposed]	8.4 % [649]
Number of Days Fish Exposed	28

Middle 80% of Run Period (Apr 20 - May 29)

Number of Fish Observed	6280
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [6280]
Temperature Tailrace Exposure Index	11.72 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 30 - May 16)

Number of Fish Observed	4270
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [4270]
Temperature Tailrace Exposure Index	11.76 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Mar 12
5% of Run passed	Apr 15
10% of Run passed	Apr 20
50% of Run passed	May 8
90% of Run passed	May 29
95% of Run passed	Jun 3
Last Day of Run	Dec 27

Date(s) When Temperature Tailrace Crosses 15 °C

May 30

Jun 5

Jun 8

Oct 23