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Lower American Temperature Threshold


This page provides analysis, based on Reclamation 2019 Proposed Action, of current and historical temperature conditions for fish using only observed data. Actual pre-season and in-season management decision processes are complex employing multiple sources of observed data, models, and forecasts. For further information, see the Thresholds section.

View Data for: Note: Years prior to 2019 pre-date the Reclamation Proposed Action and are provided for historical perspective on conditions.
graph 2024 American R blw Watt Ave Bridge (AWB) Water Temp (°F)
graph 2024 American R blw Watt Ave Bridge (AWB) Water Temp (°F)

2024 Temperature Threshold Analysis and Exceedance

Steelhead
Life Stage
Life Stage
Dates
Criterion Possible
Days
Data
Days
Missing
Data
Days
Total Period Analyzed Criteria Exceedance
Average
Temperature
Days in
Threshold
Days First Day Last Day
Juvenile Rearing 5/15-10/31 Below/Equal 65°F 0 0 0          
Juvenile Rearing (limited coldwater) 5/15-10/31 Below/Equal 68°F 0 0 0          
Spawning 11/1-12/31 Below/Equal 56°F 0 0 0          

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Color Vision Deficiency (CVD) colors

Lower American Temperature Threshold Analysis History

graph Lower American Temperature Threshold Analysis History

2024 Lower American Temperature Threshold Analysis Data Table for American R blw Watt Ave Bridge (AWB)

Date Value Rearing
65°F
5/15-10/31
Rearing (limited coldwater)
68°F
5/15-10/31
Spawning
56°F
11/1-12/31
Date Value Rearing
65°F
5/15-10/31
Rearing (limited coldwater)
68°F
5/15-10/31
Spawning
56°F
11/1-12/31
2024-03-28 52.44      
2024-03-27 52.18      
2024-03-26 53.29      
2024-03-25 52.15      
2024-03-24 52.29      
2024-03-23 52.42      
2024-03-22 52.53      
2024-03-21 52.91      
2024-03-20 53.33      
2024-03-19 53.29      
2024-03-18 52.94      
2024-03-17 52.80      
2024-03-16 52.61      
2024-03-15 52.14      
2024-03-14 51.28      
2024-03-13 51.32      
2024-03-12 51.48      
2024-03-11 51.44      
2024-03-10 51.18      
2024-03-09 51.26      
2024-03-08 51.32      
2024-03-07 50.90      
2024-03-06 50.70      
2024-03-05 50.46      
2024-03-04 49.73      
2024-03-03 49.58      
2024-03-02 49.72      
2024-03-01 50.26      
2024-02-29 50.61      
2024-02-28 51.10      
2024-02-27 50.71      
2024-02-26 51.08      
2024-02-25 51.02      
2024-02-24 50.77      
2024-02-23 50.45      
2024-02-22 50.72      
2024-02-21 50.80      
2024-02-20 50.74      
2024-02-19 50.69      
2024-02-18 50.35      
2024-02-17 49.65      
2024-02-16 49.69      
2024-02-15 50.09      
2024-02-14 50.09      
2024-02-13 50.18      
2024-02-12 49.95      
2024-02-11 50.12      
2024-02-10 50.01      
2024-02-09 49.82      
2024-02-08 50.20      
2024-02-07 50.17      
2024-02-06 51.49      
2024-02-05 51.83      
2024-02-04 51.10      
2024-02-03 50.35      
2024-02-02 51.36      
2024-02-01 51.66      
2024-01-31 51.44      
2024-01-30 52.59      
2024-01-29 52.00      
2024-01-28 51.83      
2024-01-27 51.28      
2024-01-26 51.20      
2024-01-25 51.48      
2024-01-24 51.51      
2024-01-23 52.00      
2024-01-22 52.02      
2024-01-21 51.83      
2024-01-20 51.53      
2024-01-19 50.86      
2024-01-18 50.63      
2024-01-17 51.49      
2024-01-16 50.50      
2024-01-15 50.79      
2024-01-14 50.46      
2024-01-13 49.48      
2024-01-12 49.19      
2024-01-11 49.42      
2024-01-10 50.08      
2024-01-09 50.25      
2024-01-08 49.97      
2024-01-07 50.33      
2024-01-06 50.58      
2024-01-05 51.30      
2024-01-04 50.92      
2024-01-03 51.40      
2024-01-02 51.37      
2024-01-01 52.30      


Calendar Year 2024 Lower American River Flow and Temperature Data Table
Date Lake Natoma (Nimbus Dam) (NAT)
Reservoir Outflow (CFS)
American R at Fair Oaks (AFO)
Water Temperature (°F)
American R blw Watt Ave Bridge (AWB)
Water Temperature (°F)
2024-01-011984.0052.1952.30
2024-01-021944.0051.9351.37
2024-01-032025.3251.6251.40
2024-01-041989.6351.5050.92
2024-01-051792.6352.1551.30
2024-01-061738.4651.9350.58
2024-01-071743.5051.5550.33
2024-01-081737.0451.1049.97
2024-01-091735.0050.8050.25
2024-01-101730.3350.6450.08
2024-01-111742.5450.4449.42
2024-01-121768.0450.1649.19
2024-01-131783.4650.2249.48
2024-01-141779.4250.5450.46
2024-01-151830.0850.6750.79
2024-01-161789.1350.7250.50
2024-01-171789.7950.8951.49
2024-01-181787.6450.7150.63
2024-01-191791.2150.6350.86
2024-01-201789.0450.7551.53
2024-01-211795.3351.1651.83
2024-01-221785.3851.2652.02
2024-01-231778.2251.0652.00
2024-01-241776.1350.8051.51
2024-01-251781.3850.6151.48
2024-01-261775.9650.9451.20
2024-01-271767.3850.9551.28
2024-01-281766.7151.1051.83
2024-01-291769.6151.1252.00
2024-01-301743.3851.0052.59
2024-01-311736.4650.9751.44
2024-02-011734.2151.0551.66
2024-02-021736.0450.6151.36
2024-02-031739.0050.8150.35
2024-02-041739.9250.8551.10
2024-02-051739.0850.9251.83
2024-02-061741.1351.0751.49
2024-02-071792.8351.0850.17
2024-02-082300.9650.4350.20
2024-02-092445.8350.0349.82
2024-02-102467.2550.1950.01
2024-02-112994.8350.0650.12
2024-02-123489.4250.0049.95
2024-02-133494.3350.1650.18
2024-02-144660.3350.1850.09
2024-02-156041.7949.7650.09
2024-02-166036.5849.8349.69
2024-02-176029.4649.7949.65
2024-02-185991.4249.9550.35
2024-02-196029.8350.3050.69
2024-02-205991.8350.4150.74
2024-02-215970.4650.5450.80
2024-02-225974.0850.5350.72
2024-02-235993.0050.3350.45
2024-02-245959.7950.4850.77
2024-02-256013.3350.7751.02
2024-02-266021.5450.8051.08
2024-02-275734.0050.6350.71
2024-02-286081.7051.0551.10
2024-02-296011.6750.4650.61
2024-03-016039.1750.0550.26
2024-03-025946.6749.7549.72
2024-03-036054.3849.8549.58
2024-03-046021.8849.9849.73
2024-03-055981.4250.6150.46
2024-03-065904.6750.5150.70
2024-03-076013.0050.6350.90
2024-03-086037.0051.1351.32
2024-03-096002.6351.1351.26
2024-03-105880.0050.9351.18
2024-03-115872.3851.2251.44
2024-03-125878.4651.3451.48
2024-03-135438.1750.9751.32
2024-03-145281.2551.2351.28
2024-03-154989.8851.7152.14
2024-03-164970.1351.9052.61
2024-03-174976.6751.9552.80
2024-03-185002.4252.1452.94
2024-03-195022.7952.4853.29
2024-03-205045.4252.4753.33
2024-03-215066.2552.0352.91
2024-03-224553.5052.0552.53
2024-03-234482.7152.0552.42
2024-03-244537.7551.5352.29
2024-03-254535.7951.8052.15
2024-03-264523.6752.6653.29
2024-03-274484.3852.1152.18
2024-03-284594.2951.7052.44

Data Methods, Notes, Citations

Data Methods

  1. Data Courtesy of CDEC
  2. Hourly data for American R blw Watt Ave Bridge (AWB) is retrieved from CDEC on a daily basis.
  3. Columbia Basin Research (CBR) QA/QC process on AWB hourly data for outliers, false data (e.g., 32°F measured by satellite), and data outside expected range of observation (e.g., 90°F). Data loaded into CBR database.
  4. CBR calculates Daily Average values based on CBR cleaned hourly values.
  5. Query for daily average water temperature for selected year.
  6. Examine daily average data record for 65°F exceedance.
  7. Examine daily average data record for 68°F exceedance.

Threshold Analysis Criteria

Please refer to the American River Group (ARG) Annual Report of Activities for details on within water year activities.

Target analysis and exceedance found on this page is based on criteria as described in Reclamation 2019, p4-2.

Reclamation 2019. Reinitiation of Consultation on the Coordinated Long-Term Operation of the Central Valley Project and State Water Project Central Valley Project, California Mid-Pacific Region, Final Biological Assessment, Chapter 4: Proposed Action. October 21. Available online: https://www.usbr.gov/mp/bdo/lto/biop.html

May 15 through October 31 daily average water temperature of 65°F (or target temperature determined by temperature model) or lower at Watt Avenue Bridge. When the target temperature requirement cannot be met because of limited coldwater availability in Folsom Reservoir, then the target daily average water temperature at Watt Avenue may be increased incrementally (i.e., no more than 1°F every 12 hours) to as high as 68°F. November 1 through December 31 daily average water temperature of 56°F target if cold water pool allows. A temperature higher than 56°F may be targeted based on temperature modeling results.

Citation
Columbia Basin Research, University of Washington. (2024). SacPAS Lower American Temperature Threshold. Available from www.cbr.washington.edu/sacramento/data/tc_american.html
Generated: 29 Mar 2024 06:45:34 PDT. www.cbr.washington.edu/sacramento/data/.

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SacPAS: Central Valley Prediction & Assessment of Salmon, University of Washington, Columbia Basin Research, www.cbr.washington.edu/sacramento/