Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Spring/Summer Chinook 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 24 - Dec 15)

Total Number of Fish Observed	1225
Percent of Total Run Analyzed [Number Observed]	100 % [1225]
Tailrace TDG Percent Exposure Index	119.75 %
Percent of Fish Exposed [Number Exposed]	47.6 % [584]
Number of Days Fish Exposed	36

Middle 80% of Run Period (Apr 17 - May 22)

Number of Fish Observed	991
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [991]
Tailrace TDG Percent Exposure Index	120.15 %
Percent of Fish Exposed [Number Exposed]	48.4 % [480]
Number of Days Fish Exposed	20

Middle 50% of Run Period (Apr 24 - May 12)

Number of Fish Observed	656
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [656]
Tailrace TDG Percent Exposure Index	120.52 %
Percent of Fish Exposed [Number Exposed]	49.3 % [324]
Number of Days Fish Exposed	11

Run Dates

First Day of Run	Mar 24
5% of Run passed	Apr 11
10% of Run passed	Apr 17
50% of Run passed	May 1
90% of Run passed	May 22
95% of Run passed	May 30
Last Day of Run	Dec 15

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

Jun 25

Jun 26

Jun 28

Jun 29

Jul 1

Jul 2

Jul 7

Jul 8

Jul 9

Jul 14

Jul 20

Jul 21

Jul 26

Jul 28