Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead Query Parameters

Year	2025
Project	Lower Monumental
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 19 - Dec 8)

Total Number of Fish Observed	349
Percent of Total Run Analyzed [Number Observed]	100 % [349]
Tailrace TDG Percent Exposure Index	119.09 %
Percent of Fish Exposed [Number Exposed]	45.8 % [160]
Number of Days Fish Exposed	23

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]
Tailrace TDG Percent Exposure Index	120 %
Percent of Fish Exposed [Number Exposed]	53.8 % [154]
Number of Days Fish Exposed	19

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]
Tailrace TDG Percent Exposure Index	120.7 %
Percent of Fish Exposed [Number Exposed]	65.9 % [130]
Number of Days Fish Exposed	12

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 Tailrace TDG Percent Crosses 120 %

Apr 12

Apr 19

May 4

May 7

May 8

May 16

May 17

May 18

May 28

Jun 3

Jul 7

Jul 8

Jul 22

Jul 24

Nov 18

Nov 21