Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead Query Parameters

Year	2025
Project	McNary
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 27 - Jun 16)

Total Number of Fish Observed	356
Percent of Total Run Analyzed [Number Observed]	100 % [356]
Tailrace TDG Percent Exposure Index	117.69 %
Percent of Fish Exposed [Number Exposed]	33.7 % [120]
Number of Days Fish Exposed	35

Middle 80% of Run Period (Apr 2 - May 23)

Number of Fish Observed	290
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [290]
Tailrace TDG Percent Exposure Index	117.63 %
Percent of Fish Exposed [Number Exposed]	35.8 % [104]
Number of Days Fish Exposed	27

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

Number of Fish Observed	194
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [194]
Tailrace TDG Percent Exposure Index	119.36 %
Percent of Fish Exposed [Number Exposed]	53.6 % [104]
Number of Days Fish Exposed	27

Run Dates

First Day of Run	Mar 27
5% of Run passed	Mar 30
10% of Run passed	Apr 2
50% of Run passed	Apr 30
90% of Run passed	May 23
95% of Run passed	May 29
Last Day of Run	Jun 16

Date(s) When Tailrace TDG Percent Crosses 120 %

Apr 10

Apr 21

Apr 23

Apr 24

Apr 30

May 3

May 5

May 15

May 16

May 18

May 29

Jun 6