SacPAS: Central Valley Prediction & Assessment of Salmon

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Stanislaus River Flow and Temperature


This page provides data, based on NMFS 2019, of current and historical river flow and water temperature conditions for fish using only observed data. Actual pre-season and in-season management are complex processes employing multiple sources of observed data, models, and forecasts. For further information, see the Temperature Threshold section.

View Data for: Note: Years prior to 2019 pre-date the BiOp and are provided for historical perspective on conditions.
graph 2021 River Flow and Water Temp (F)

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Note: Years prior to 2019 pre-date the BiOp and are provided for historical perspective on conditions.

2021 Stanislaus River Flow and Temperature Data Table

Year Month Day Stanislaus at Orange Blossom Bridge (OBB)
Water Temperature (F)
Goodwind Dam downstream (USGS 11302000)
Water Temperature (F)
Stanislaus at Ripon (RIP)
Water Temperature (F)
Goodwin Dam (GDW)
Spillway Discharge (CFS)
2021 01 22 49.31 49.87 48.35 202.00
2021 01 21 48.89 49.87 48.09 203.00
2021 01 20 48.98 49.87 48.91 204.00
2021 01 19 50.27 50.17 49.95 202.00
2021 01 18 51.15 50.54 51.33 202.00
2021 01 17 51.10 50.67 51.43 202.00
2021 01 16 51.23 50.53 51.38 202.00
2021 01 15 50.65 50.41 50.43 202.00
2021 01 14 51.15 50.35 50.38 203.00
2021 01 13 50.35 50.16 49.30 202.00
2021 01 12 49.35 49.91 47.71 202.00
2021 01 11 49.43 49.81 47.38 202.00
2021 01 10 48.83 49.76 48.08 202.00
2021 01 09 49.92 50.02 48.57 203.00
2021 01 08 50.02 50.13 48.00 392.00
2021 01 07 49.37 49.83 47.85 440.00
2021 01 06 49.65 49.72 47.80 203.00
2021 01 05 49.65 49.82 48.68 204.00
2021 01 04 50.80 50.19 49.65 205.00
2021 01 03 50.59 49.99 49.03 205.00
2021 01 02 49.83 49.43 48.25 201.00
2021 01 01 49.29 49.00 47.92 201.00

Data Methods, Notes, Citations

Temperature Threshold

Please refer to the Stanislaus Operations Group (SOG) annual reports for details on within water year activities.

NMFS 2019. Biological Opinion on Long Term Operation of the Central Valley Project and the State Water Project. WCR-2016-00069. October 21. 871 pg. Plus appendices. Available online: https://www.usbr.gov/mp/bdo/lto/biop.html

Direct quote from NMFS 2019, p807.

13.3.4.1 Take Anticipated from Water Temperature Effects

Suboptimal water temperatures in the Stanislaus River are reasonably expected to result in reduced survival during egg-to-fry life stage and reduced growth for the juvenile and smolt life stages for CCV steelhead.

The ecological surrogate to define the extent of take in the Stanislaus River is both the magnitude and frequency of suboptimal water temperature in the reach from Goodwin Dam to Orange Blossom Bridge during times when CCV steelhead are present. Because of the causal relationship of flow magnitude, timing, duration, frequency, and rate of change to survival within and between life stages, flow may be used as a surrogate for the amount or extent of take for listed salmonids.

The CCV steelhead egg-to-fry life stage occurs December through May and temperatures above 54°F create suboptimal conditions for this life stage. A small proportion of CCV steelhead eggs will still be in redds during May and potentially exposed to water temperatures that will be expected to result in egg mortality. The extent of take is all redds exposed to temperatures above 54°F in the vicinity of Orange Blossom Bridge December 1 through May 31. Take of CCV steelhead during the egg-to-fry life stage during these months is expected to be minimal because few eggs would still be in redds.

Steelhead juveniles can survive and grow at water temperatures of 45 to 66°F. Reduced survival is anticipated at temperatures at or above 68°F. The ecological surrogate to define the amount or extent of take of CCV steelhead juvenile life stage is daily average temperature at Orange Blossom Bridge May 15 to October 31. The anticipated level of take will be exceeded if temperatures at Orange Blossom Bridge exceed 68°F between May 15 to October 31 for more than seven consecutive days unless Reclamation and NMFS agree that it is an acceptable exceedance given the hydrologic and meteorological conditions for that year.


Citation
Columbia Basin Research, University of Washington. (2021). SacPAS Stanislaus River Flow and Temperature. Available from http://www.cbr.washington.edu/sacramento/data/tc_stanislaus.html
Generated: 23 Jan 2021 06:45:05 PST. 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/