Rivermatics

USGS Streamgage 11303000

Stanislaus River A Ripon, CA

Stanislaus River A Ripon, CA is USGS streamgage 11303000 in California, monitoring river discharge in hydrologic subbasin 18040010. It drains a watershed of about 1,075 square miles. Discharge records at this site go back to 1938. Typical flow runs near 362.4 cfs in July and 988.1 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

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Gauge details

State
California
Drainage area
1,075 sq mi
Gauge elevation
3 ft
Subbasin (HUC-8)
18040010
Coordinates
37.72962, -121.11045
USGS site number
11303000
Records begin
1938-02-12 (88 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Stanislaus River A Ripon, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
162 172 181
160 173 185
159 174 191
158 174 196
156 174 205
154 174 208
152 174 208
151 174 212
151 175 219
148 174 213
145 174 217
145 176 227
144 177 234
141 176 232

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 86 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 171.4 463.5 2,574.2
February 176.9 639.7 2,703.8
March 201.1 825.9 3,223.9
April 178.6 988.1 3,773.7
May 158.8 1,349 4,711
June 139.4 867.5 3,284
July 114.8 362.4 1,358.7
August 120.5 251.8 1,198.7
September 130.1 256 645.9
October 154.2 330.9 1,010.3
November 172.8 322.2 729.7
December 181.8 358.4 1,428.7

All values in cubic feet per second (cfs).

Common questions

When does Stanislaus River A Ripon, CA normally run highest?
May, on the long-term record. The median daily flow that month is about 1,349 cfs, against 251.8 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Stanislaus River A Ripon, CA?
It depends on the month. In January, half of days historically fall near 463.5 cfs, with the middle 80% of days between 171.4 and 2,574.2 cfs. The month-by-month table on this page gives the full range.
How long has Stanislaus River A Ripon, CA been measured?
Discharge records at USGS site 11303000 begin in 1938, about 88 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Stanislaus River A Ripon, CA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Stanislaus River A Ripon, CA?
The gauge sits at 37.72962, -121.11045, in California, in hydrologic subbasin 18040010, at an elevation of about 3 feet, draining roughly 1,075 square miles.
Can I use Stanislaus River A Ripon, CA data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other gauges in this subbasin