Columbia Basin Performance Measures

Sample Exposure Summary Tables for Multiple Years: PIT Tagged Juvenile Chinook Snake R Fall ESU

• Project Lower Granite
• River Parameter Temperature Tailrace
• Critical Temperature Tailrace Value 18 °C
• Exposure Calculated Above Critical Value

Year 2024 Summary

Total Run Period (Mar 2 - Dec 16)

Total Number of Fish Observed	18303
Percent of Total Run Analyzed [Number Observed]	100 % [18303]
Temperature Tailrace Exposure Index	15.03 °C
Percent of Fish Exposed [Number Exposed]	17.8 % [3265]
Number of Days Fish Exposed	73

Middle 80% of Run Period (May 18 - Jul 3)

Number of Fish Observed	14989
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [14989]
Temperature Tailrace Exposure Index	14.76 °C
Percent of Fish Exposed [Number Exposed]	11.5 % [1735]
Number of Days Fish Exposed	6

Run Dates

First Day of Run	Mar 2
5% of Run passed	May 16
10% of Run passed	May 18
50% of Run passed	Jun 8
90% of Run passed	Jul 3
95% of Run passed	Jul 9
Last Day of Run	Dec 16

Date(s) When Temperature Tailrace Crosses 18 °C

Jun 28

Oct 6

Year 2023 Summary

Total Run Period (Mar 15 - Dec 9)

Total Number of Fish Observed	28982
Percent of Total Run Analyzed [Number Observed]	100 % [28982]
Temperature Tailrace Exposure Index	15.43 °C
Percent of Fish Exposed [Number Exposed]	24.7 % [7167]
Number of Days Fish Exposed	65

Middle 80% of Run Period (May 17 - Jul 7)

Number of Fish Observed	23771
Percent of Middle 80% of Run Analyzed [Number Observed]	100 % [23771]
Temperature Tailrace Exposure Index	15.34 °C
Percent of Fish Exposed [Number Exposed]	18.4 % [4381]
Number of Days Fish Exposed	9

Run Dates

First Day of Run	Mar 15
5% of Run passed	May 16
10% of Run passed	May 17
50% of Run passed	Jun 5
90% of Run passed	Jul 7
95% of Run passed	Jul 10
Last Day of Run	Dec 9

Date(s) When Temperature Tailrace Crosses 18 °C

Jun 29

Sep 28

Year 2022 Summary

Total Run Period (Mar 3 - Dec 19)

Total Number of Fish Observed	21194
Percent of Total Run Analyzed [Number Observed]	93.92 % [19907]1
Temperature Tailrace Exposure Index	13.31 °C
Percent of Fish Exposed [Number Exposed]	18.9 % [3781]
Number of Days Fish Exposed	83

Middle 80% of Run Period (May 28 - Jul 19)

Number of Fish Observed	17213
Percent of Middle 80% of Run Analyzed [Number Observed]	92.52 % [15926]
Temperature Tailrace Exposure Index	13.08 °C
Percent of Fish Exposed [Number Exposed]	13.2 % [2103]
Number of Days Fish Exposed	10

Run Dates

First Day of Run	Mar 3
5% of Run passed	May 19
10% of Run passed	May 28
50% of Run passed	Jun 7
90% of Run passed	Jul 19
95% of Run passed	Jul 29
Last Day of Run	Dec 19

Date(s) When Temperature Tailrace Crosses 18 °C

Jul 10

Sep 16

Sep 24

Oct 15