Columbia Basin Performance Measures

Adult Passage Exposure Results

Adult Steelhead Query Parameters

Year	2024
Project	John Day
River Parameter	Temperature Tailrace
Critical Temperature Tailrace Value	15 °C
Calculate Exposure	Above Critical Value
River Parameter Data Fill	No
Query Dates	1/1 - 12/31

Total Run Period (Jan 3 - Oct 31)

Total Number of Fish Observed	127116
Percent of Total Run Analyzed [Number Observed]	100 % [127116]
Temperature Tailrace Exposure Index	20.03 °C
Percent of Fish Exposed [Number Exposed]	98.8 % [125677]
Number of Days Fish Exposed	145

Middle 80% of Run Period (Aug 2 - Oct 9)

Number of Fish Observed	102523
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [102523]
Temperature Tailrace Exposure Index	20.44 °C
Percent of Fish Exposed [Number Exposed]	100 % [102523]
Number of Days Fish Exposed	69

Middle 50% of Run Period (Sep 1 - Sep 26)

Number of Fish Observed	67970
Percent of Middle 50% of Run Analyzed [Number Observed]	100 % [67970]
Temperature Tailrace Exposure Index	20.53 °C
Percent of Fish Exposed [Number Exposed]	100 % [67970]
Number of Days Fish Exposed	26

Run Dates

First Day of Run	Jan 3
5% of Run passed	Jul 11
10% of Run passed	Aug 2
50% of Run passed	Sep 16
90% of Run passed	Oct 9
95% of Run passed	Oct 18
Last Day of Run	Oct 31

Date(s) When Temperature Tailrace Crosses 15 °C

Jun 7

Oct 30