Columbia Basin Performance Measures

PIT Tag Exposure Results

PIT-Tagged Wild Summer Steelhead Query Parameters

Year	2025
Project	Ice Harbor
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 (Jan 1 - Jun 30)

Total Number of Fish Observed	371
Percent of Total Run Analyzed [Number Observed]	100 % [371]
Tailrace TDG Percent Exposure Index	116.73 %
Percent of Fish Exposed [Number Exposed]	9.1 % [34]
Number of Days Fish Exposed	4

Middle 80% of Run Period (Apr 11 - May 25)

Number of Fish Observed	304
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [304]
Tailrace TDG Percent Exposure Index	117.19 %
Percent of Fish Exposed [Number Exposed]	11.1 % [34]
Number of Days Fish Exposed	4

Middle 50% of Run Period (Apr 22 - May 18)

Number of Fish Observed	200
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [200]
Tailrace TDG Percent Exposure Index	117.56 %
Percent of Fish Exposed [Number Exposed]	17 % [34]
Number of Days Fish Exposed	4

Run Dates

First Day of Run	Jan 1
5% of Run passed	Apr 1
10% of Run passed	Apr 11
50% of Run passed	May 9
90% of Run passed	May 25
95% of Run passed	Jun 4
Last Day of Run	Jun 30

Date(s) When Tailrace TDG Percent Crosses 120 %

May 11

May 15