Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult 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 (Apr 1 - Oct 31)

Total Number of Fish Observed	75582
Percent of Total Run Analyzed [Number Observed]	100 % [75582]
Tailrace TDG Percent Exposure Index	103.98 %
Percent of Fish Exposed [Number Exposed]	0.8 % [611]
Number of Days Fish Exposed	22

Middle 80% of Run Period (Sep 6 - Oct 20)

Number of Fish Observed	61921
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [61921]
Tailrace TDG Percent Exposure Index	102.91 %
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Middle 50% of Run Period (Sep 21 - Oct 11)

Number of Fish Observed	39658
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [39658]
Tailrace TDG Percent Exposure Index	102.76 %
Percent of Fish Exposed [Number Exposed]	0 % [0]
Number of Days Fish Exposed	0

Run Dates

First Day of Run	Apr 1
5% of Run passed	Jul 29
10% of Run passed	Sep 6
50% of Run passed	Oct 1
90% of Run passed	Oct 20
95% of Run passed	Oct 24
Last Day of Run	Oct 31

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