University of Washington

Salmonids, Steelhead, and Current Conditions for the Stanislaus Watershed Team

Stanislaus Temperature and Flow

multi-line plot water temperature and flow
Water Year 2027 Stanislaus River flow and water temperatures (daily) since October 1, 2025. Data from GDW, KOT, OBB, RIP stations retrieved from CDEC. Data from USGS gage 11302000 (Canyon) retrieved from NWIS. Figure generated by SacPAS including temperature threshold reference lines.

Current River Conditions

Stanislaus Watershed Select River Conditions for 2026-11-12

  Stanislaus Tuolumne Merced San Joaquin
Location GDW OBB RIP KOT LGN TRW MOD TRT MBH CRS MST NEW MRB VNS MSD OH1
Flow (CFS) 350    402    301    367      187    146    192    200    158    146    509    634    1114    1124    754   
Click on the icon to view current 60 days plot for location and river conditions.
  Stanislaus Tuolumne Merced San Joaquin
Location OBB RIP RPN MOD CRS VNS MSD OH1
Water Temperature (°F) 55.3    55.1    56.5    57.7    58.0    57.9    59.6    59.8   
Click on the icon to view current 60 days plot for location and river conditions.
  Stanislaus Tuolumne Merced San Joaquin
Location SNS TLG MRC SBF
Full Natural Flow (CFS) 126 a    86 a    102 a    254 a   
Note: a. Data is not available for 2026-11-12. Most recent data up to 5 days prior is reported.
Click on the icon to view current 60 days plot for location and river conditions.
  Stanislaus Tuolumne Merced San Joaquin
Location NML DNP EXC MIL
Reservoir Storage (TAF) 1511    1473    499    221   
Res Above Top of Conserv Stor (TAF) -458    -219 a    -174 a    -214 a   
Reservoir Inflow (CFS) 514    302 a    91 a    416 a   
Reservoir Outflow (CFS) 42    302 a    1076 a    425 a   
Note: a. Data is not available for 2026-11-12. Most recent data up to 5 days prior is reported.
Click on the icon to view current 60 days plot for location and river conditions.
  Stanislaus San Joaquin
Location RPN MSD OH1
Dissolved Oxygen (mg/L) 10.1    9.2    8.9   
Click on the icon to view current 60 days plot for location and river conditions.
Data retrieved from CDEC; Current River Conditions tables generated by SacPAS.

Juvenile Sampling

No data for daily catch of unmarked Chinook at Caswell Memorial State Park Rotary Screw Traps in WY2027.

No data for daily catch of marked and unmarked Chinook at Mossdale Trawls in WY2027.

Juvenile Sampling Summary

Juvenile Sampling Summary for 10/30/2026-11/12/2026 (last 14 days) and 10/16/2026-10/29/2026 (previous 14 days)
Date RangeData ItemCaswell Memorial State Park RSTsMossdale TrawlsAntioch Dunes SJ001SEddo's SJ005NMedford Island SJ026SLost Isle SJ032SDad's Point SJ041NDos Reis SJ051EMossdale SJ056EWeatherbee SJ058WBig Beach SJ063WDurham Site SJ068WSturgeon Bend SJ074WTwo Rivers RV Park SJ075ERoute 132 SJ077EN. of Tuol. R. SJ083W
Date RangeData ItemCaswell Memorial State Park RSTsMossdale TrawlsAntioch Dunes SJ001SEddo's SJ005NMedford Island SJ026SLost Isle SJ032SDad's Point SJ041NDos Reis SJ051EMossdale SJ056EWeatherbee SJ058WBig Beach SJ063WDurham Site SJ068WSturgeon Bend SJ074WTwo Rivers RV Park SJ075ERoute 132 SJ077EN. of Tuol. R. SJ083W
10/30/2026-11/12/2026Min Sample Date2026-11-02
10/30/2026-11/12/2026Max Sample Date2026-11-10
10/30/2026-11/12/2026Days with Sampling0000000000000000
10/30/2026-11/12/2026Fall Chinook0
10/30/2026-11/12/2026Spring Chinook0
10/30/2026-11/12/2026Winter Chinook0
10/30/2026-11/12/2026LateFall Chinook0
10/30/2026-11/12/2026Chinook (ad-clip)0
10/30/2026-11/12/2026Steelhead (natural)0
10/30/2026-11/12/2026Steelhead (ad-clip)0
10/30/2026-11/12/2026Avg Flow (cfs)497.21461.3
10/30/2026-11/12/2026Avg Water Temp (F)32.058.0
10/30/2026-11/12/2026Avg Turbidity (NTU)
10/16/2026-10/29/2026Min Sample Date2026-10-222026-10-23
10/16/2026-10/29/2026Max Sample Date2026-10-262026-10-29
10/16/2026-10/29/2026Days with Sampling0000000000000000
10/16/2026-10/29/2026Fall Chinook00
10/16/2026-10/29/2026Spring Chinook00
10/16/2026-10/29/2026Winter Chinook00
10/16/2026-10/29/2026LateFall Chinook00
10/16/2026-10/29/2026Chinook (ad-clip)00
10/16/2026-10/29/2026Steelhead (natural)00
10/16/2026-10/29/2026Steelhead (ad-clip)00
10/16/2026-10/29/2026Avg Flow (cfs)715.11961.4
10/16/2026-10/29/2026Avg Water Temp (F)32.063.164.3
10/16/2026-10/29/2026Avg Turbidity (NTU)
source of Avg Flow (cfs)Ripon USGS (CDEC:RIP)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)Vernalis (CDEC:VNS)
source of Avg Water Temp (F)Caswell RSTVernalis (CDEC:VNS)Antioch DunesEddo'sMedford IslandLost IsleDad's PointDos ReisMossdaleWeatherbeeBig BeachDurham SiteSturgeon BendTwo Rivers RV ParkRoute 132N. of Tuol. R.
source of Avg Turbidity (NTU)Caswell RSTsMossdale TrawlsAntioch DunesEddo'sMedford IslandLost IsleDad's PointDos ReisMossdaleWeatherbeeBig BeachDurham SiteSturgeon BendTwo Rivers RV ParkRoute 132N. of Tuol. R.
  • Caswell Memorial State Park RSTs: Preliminary data from PSMFC via CalFish and CDEC; subject to revision.
  • Mossdale Trawls: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Antioch Dunes Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Eddo's Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Medford Island Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Lost Isle Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Dad's Point Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Dos Reis Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Mossdale Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Weatherbee Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Big Beach Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Durham Site Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Sturgeon Bend Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Two Rivers RV Park Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Route 132 Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • N. of Tuol. R. Beach Seine: Preliminary data from USFWS Lodi and CDEC; subject to revision.
  • Averages: calculated for all non-null data points within the 7 day reporting period.
Data retrieved from PSMFC via CalFish, CDEC, DatCall email distribution. Figure and Table generated by SacPAS.

60-Day Water Temperature Daily Min, Max, Average Figures

stacked chart knights ferry water temperature min, max, average
Stacked chart for daily water temperatures Stanislaus River upstream of Knights Ferry for current 60 days period. Top chart: Daily Min, Max and average water temperatures (in degrees Fahrenheit). Bottom chart: Daily difference between Max and Min measured water temperature in degrees Fahrenheit. Data from USGS gage 11302000 retrieved from NWIS; figure generated by SacPAS (including date-based water temperature threshold reference lines).
stacked chart orange blossom bridge water temperature min, max, average
Stacked chart for daily water temperatures Stanislaus River at Orange Blossom Bridge for current 60 days period. Top chart: Daily Min, Max and average water temperatures (in degrees Fahrenheit). Bottom chart: Daily difference between Max and Min measured water temperature in degrees Fahrenheit. Data from OBB station retrieved from CDEC; figure generated by SacPAS (including date-based water temperature threshold reference lines).
stacked chart ripon water temperature min, max, average
Stacked chart for daily water temperatures Stanislaus River at Ripon for current 60 days period. Top chart: Daily Min, Max and average water temperatures (in degrees Fahrenheit). Bottom chart: Daily difference between Max and Min measured water temperature in degrees Fahrenheit. Data from USGS RIP station retrieved from CDEC; figure generated by SacPAS (including date-based water temperature threshold reference lines).
stacked chart vernalis water temperature min, max, average
Stacked chart for daily water temperatures San Joaquin River near Vernalis for current 60 days period. Top chart: Daily Min, Max and average water temperatures (in degrees Fahrenheit). Bottom chart: Daily difference between Max and Min measured water temperature in degrees Fahrenheit. Data from VNS station retrieved from CDEC; figure generated by SacPAS (including date-based water temperature threshold reference lines).

Historical & Current Water Temperature Figures

heatmap knights ferry historical water temperature
Historical daily water temperatures from 2007 to present date, Stanislaus River upstream of Knights Ferry for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. Water temperatures in degrees Fahrenheit are color-coded by threshold reference categories (1) steelhead alevins below 54 degrees Fahrenheit, (2) steelhead juveniles (suboptimal) above 68 degrees Fahrenheit, and (3) degrees Fahrenheit between the two. Temperature based coding is for reference only; fish are not present for all dates or all locations. Data from USGS gage 11302000 retrieved from NWIS; figure generated by SacPAS.
multi-line plot knights ferry historical water temperature
Historical daily water temperatures (in degrees Fahrenheit) from 2007 to present date, Stanislaus River upstream of Knights Ferry for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. For all data presented, the minimum Date Period Mean is plotted as Black dotted line. For all data presented, the maximum Date Period Mean is plotted as Black dashed line. Current year is indicated by Black bold solid line. Data from USGS gage 11302000 retrieved from NWIS; figure generated by SacPAS.
heatmap orange blossom bridge historical water temperature
Historical daily water temperatures from 2000 to present date, Stanislaus River at Orange Blossom Bridge for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. Water temperatures in degrees Fahrenheit are color-coded by threshold reference categories (1) steelhead alevins below 54 degrees Fahrenheit, (2) steelhead juveniles (suboptimal) above 68 degrees Fahrenheit, and (3) degrees Fahrenheit between the two. Temperature based coding is for reference only; fish are not present for all dates or all locations. Data from OBB station retrieved from CDEC; figure generated by SacPAS.
multi-line plot orange blossom bridge historical water temperature
Historical daily water temperatures (in degrees Fahrenheit) from 2000 to present date, Stanislaus River at Orange Blossom Bridge for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. For all data presented, the minimum Date Period Mean is plotted as Black dotted line. For all data presented, the maximum Date Period Mean is plotted as Black dashed line. Current year is indicated by Black bold solid line. Data from OBB station retrieved from CDEC; figure generated by SacPAS.
heatmap Ripon historical water temperature
Historical daily water temperatures from 2011 to present date, Stanislaus River at Ripon for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. Water temperatures in degrees Fahrenheit are color-coded by threshold reference categories (1) steelhead alevins below 54 degrees Fahrenheit, (2) steelhead juveniles (suboptimal) above 68 degrees Fahrenheit, and (3) degrees Fahrenheit between the two. Temperature based coding is for reference only; fish are not present for all dates or all locations. Data from USGS RIP gage retrieved from CDEC; figure generated by SacPAS.
multi-line plot Ripon historical water temperature
Historical daily water temperatures (in degrees Fahrenheit) from 2011 to present date, Stanislaus River at Ripon for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. For all data presented, the minimum Date Period Mean is plotted as Black dotted line. For all data presented, the maximum Date Period Mean is plotted as Black dashed line. Current year is indicated by Black bold solid line. Data from USGS RIP gage retrieved from CDEC; figure generated by SacPAS.
heatmap Vernalis historical water temperature
Historical daily water temperatures from 2014 to present date, San Joaquin River near Vernalis for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. Water temperatures in degrees Fahrenheit are color-coded by threshold reference categories (1) steelhead alevins below 54 degrees Fahrenheit, (2) steelhead juveniles (suboptimal) above 68 degrees Fahrenheit, and (3) degrees Fahrenheit between the two. Temperature based coding is for reference only; fish are not present for all dates or all locations. Data from VNS station retrieved from CDEC; figure generated by SacPAS.
multi-line plot vernalis historical water temperature
Historical daily water temperatures (in degrees Fahrenheit) from 2014 to present date, San Joaquin River near Vernalis for 60 day window before and after "current calendar date". Each "year" is the calendar year for the first date in the 121 day period. For all data presented, the minimum Date Period Mean is plotted as Black dotted line. For all data presented, the maximum Date Period Mean is plotted as Black dashed line. Current year is indicated by Black bold solid line. Data from VNS station retrieved from CDEC; figure generated by SacPAS.

Hourly Dissolved Oxygen

multi-line plot hourly dissolved oxygen
Chart for hourly dissolved oxygen (mg/L) Stanislaus River at Ripon and San Joaquin River near Vernalis for current 30 days period. Data from stations RPN and SJR on CDEC; figure generated by SacPAS.

Stanislaus River Flows

multi-line plot stanislaus river flows four locations
Stanislaus River flows for current 60 day period. Data from GDW, OBB, RIP, and KOT stations on CDEC; figure generated by SacPAS.

Goodwin Dam Spillway Discharge

line plot Goodwin spillway discharge
Goodwin (daily) releases to the Stanislaus River since October 1 (water year). Data from GDW station on CDEC; figure generated by SacPAS.

Unimpaired Flow

Unimpaired flow is monitored February through June at specific locations in the Stanislaus, Tuolumne, and Merced rivers.

multi-line plot Stanislaus River unimpaired flows
Plot of unimpaired flows Stanislaus River, February through June. Period accumulated Acre Feet values are an estimate based on converting daily average CFS to daily acre feet (cfs*1.9835) and summing for the period February 1 - June 30. Data from Stanislaus R Goodwin (SNS) and Stanislaus R at Koetitz Ranch (KOT) stations retrieved from CDEC; figure generated by SacPAS (including estimated accumulated flow volume and percent).
multi-line plot Tuolumne River unimpaired flows
Plot of unimpaired flows Tuolumne River, February through June. Period accumulated Acre Feet values are an estimate based on converting daily average CFS to daily acre feet (cfs*1.9835) and summing for the period February 1 - June 30. Data from Tuolumne R La Grange Dam (TLG) and Tuolumne R at Modesto (MOD) stations retrieved from CDEC; figure generated by SacPAS (including estimated accumulated flow volume and percent).
multi-line plot Merced River unimpaired flows
Plot of unimpaired flows Merced River, February through June. Period accumulated Acre Feet values are an estimate based on converting daily average CFS to daily acre feet (cfs*1.9835) and summing for the period February 1 - June 30. Data from New Exchequer Lake McClure (EXC) and Merced R near Stevinson (MST) stations retrieved from CDEC; figure generated by SacPAS (including estimated accumulated flow volume and percent).

Data Locations Map

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Preliminary data from USFWS Lodi; subject to revision. Table generated by SacPAS.

Data Notes

Content on this page is updated daily and includes the most up-to-date datasets contained in the SacPAS database.

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