Stanislaus River Flow and Water Temperature
Ecological Thresholds Queries
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.
| Date | Stanislaus at Orange Blossom Bridge (OBB) Water Temperature (°F) |
Goodwin Dam downstream (USGS 11302000) Water Temperature (°F) |
Stanislaus at Ripon (RIP) Water Temperature (°F) |
Goodwin Dam (GDW) Spillway Discharge (CFS) |
Stanislaus at Koetitz Ranch (KOT) River Discharge (CFS) |
|---|---|---|---|---|---|
| 2024-11-06 | 50.68 | 53.98 | 578.83 | ||
| 2024-11-05 | 54.83 | 53.65 | 53.81 | 689.50 | |
| 2024-11-04 | 54.18 | 53.61 | 54.16 | 550.00 | 873.83 |
| 2024-11-03 | 54.44 | 53.75 | 54.79 | 861.00 | 1004.13 |
| 2024-11-02 | 54.78 | 53.83 | 54.72 | 1035.00 | 1110.42 |
| 2024-11-01 | 54.14 | 53.75 | 54.42 | 1290.00 | 915.08 |
| 2024-10-31 | 54.30 | 53.86 | 55.25 | 1369.00 | 527.96 |
| 2024-10-30 | 52.02 | 53.59 | 55.07 | 655.00 | 508.25 |
| 2024-10-29 | 55.33 | 53.95 | 56.14 | 338.00 | 676.96 |
| 2024-10-28 | 55.91 | 54.29 | 56.95 | 548.00 | 858.79 |
| 2024-10-27 | 55.57 | 54.46 | 55.87 | 855.00 | 993.46 |
| 2024-10-26 | 54.94 | 54.42 | 54.97 | 1034.00 | 1103.63 |
| 2024-10-25 | 54.78 | 54.32 | 55.38 | 1283.00 | 901.13 |
| 2024-10-24 | 54.98 | 54.33 | 57.32 | 1366.00 | 503.92 |
| 2024-10-23 | 54.74 | 54.67 | 57.62 | 654.00 | 487.54 |
| 2024-10-22 | 57.60 | 54.64 | 56.90 | 339.00 | 654.08 |
| 2024-10-21 | 55.72 | 54.53 | 56.33 | 550.00 | 854.08 |
| 2024-10-20 | 55.40 | 54.58 | 55.88 | 856.00 | 997.33 |
| 2024-10-19 | 55.20 | 54.57 | 55.51 | 1037.00 | 926.96 |
| 2024-10-18 | 55.22 | 54.55 | 57.05 | 1186.00 | 600.42 |
| 2024-10-17 | 55.95 | 54.68 | 60.00 | 877.00 | 414.71 |
| 2024-10-16 | 57.18 | 54.87 | 60.68 | 441.00 | 482.88 |
| 2024-10-15 | 59.54 | 55.27 | 60.08 | 344.00 | 645.71 |
| 2024-10-14 | 57.45 | 55.27 | 59.76 | 548.00 | 845.04 |
| 2024-10-13 | 56.91 | 55.09 | 59.12 | 856.00 | 942.67 |
| 2024-10-12 | 56.26 | 54.91 | 58.01 | 1034.00 | 829.25 |
| 2024-10-11 | 56.03 | 54.76 | 60.20 | 1192.00 | 528.54 |
| 2024-10-10 | 56.99 | 54.90 | 64.06 | 888.00 | 336.29 |
| 2024-10-09 | 58.17 | 55.35 | 65.93 | 459.00 | 274.13 |
| 2024-10-08 | 64.43 | 55.69 | 66.92 | 289.00 | 277.92 |
| 2024-10-07 | 66.06 | 55.85 | 67.21 | 254.00 | 292.04 |
| 2024-10-06 | 65.53 | 55.68 | 67.05 | 253.00 | 277.88 |
| 2024-10-05 | 65.40 | 55.48 | 67.05 | 255.00 | 283.38 |
| 2024-10-04 | 66.13 | 55.51 | 67.10 | 253.00 | 300.75 |
| 2024-10-03 | 66.63 | 55.58 | 67.12 | 253.00 | 285.08 |
| 2024-10-02 | 65.42 | 55.42 | 66.58 | 253.00 | 313.63 |
| 2024-10-01 | 59.35 | 55.23 | 66.17 | 254.00 | 310.29 |
Data Methods and Notes
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.