Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead Query Parameters

Year	2025
Project	Lower Monumental
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 19 - Dec 8)

Total Number of Fish Observed	349
Percent of Total Run Analyzed [Number Observed]	100 % [349]
Temperature Tailrace Exposure Index	11.71 °C
Percent of Fish Exposed [Number Exposed]	2.5 % [9]
Number of Days Fish Exposed	6

Middle 80% of Run Period (Apr 7 - May 23)

Number of Fish Observed	286
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [286]
Temperature Tailrace Exposure Index	11.92 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Apr 19 - May 17)

Number of Fish Observed	197
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [197]
Temperature Tailrace Exposure Index	12.52 °C
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Mar 19
5% of Run passed	Mar 29
10% of Run passed	Apr 7
50% of Run passed	May 11
90% of Run passed	May 23
95% of Run passed	May 26
Last Day of Run	Dec 8

Date(s) When Temperature Tailrace Crosses 15 °C

May 31

Oct 30