Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead Query Parameters

Year	2025
Project	Bonneville
River Parameter	Tailrace TDG Percent
Critical Tailrace TDG Percent Value	120 %
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	1/1 - 12/31

Total Run Period (Mar 20 - Aug 17)

Total Number of Fish Observed	1995
Percent of Total Run Analyzed [Number Observed]	100 % [1995]
Tailrace TDG Percent Exposure Index	121.21 %
Percent of Fish Exposed [Number Exposed]	96.5 % [1926]
Number of Days Fish Exposed	62

Middle 80% of Run Period (Apr 30 - Jun 1)

Number of Fish Observed	1629
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [1629]
Tailrace TDG Percent Exposure Index	121.42 %
Percent of Fish Exposed [Number Exposed]	99.2 % [1617]
Number of Days Fish Exposed	32

Middle 50% of Run Period (May 8 - May 18)

Number of Fish Observed	1009
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [1009]
Tailrace TDG Percent Exposure Index	121.37 %
Percent of Fish Exposed [Number Exposed]	100 % [1009]
Number of Days Fish Exposed	11

Run Dates

First Day of Run	Mar 20
5% of Run passed	Apr 19
10% of Run passed	Apr 30
50% of Run passed	May 12
90% of Run passed	Jun 1
95% of Run passed	Jun 4
Last Day of Run	Aug 17

Date(s) When Tailrace TDG Percent Crosses 120 %

Apr 10

May 26

May 27

Jun 12