Rivermatics

USGS Streamgage 11289650

Tuolumne River below Lagrange Dam near Lagrange, CA

Tuolumne River below Lagrange Dam near Lagrange, CA is USGS streamgage 11289650 in California, monitoring river discharge in hydrologic subbasin 18040009. It sits on the Tuolumne River, alongside 3 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,538 square miles. Discharge records at this site go back to 1970. Typical flow runs near 107 cfs in July and 550.9 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.

View live conditions & forecast →

Gauge details

State
California
Drainage area
1,538 sq mi
Gauge elevation
173 ft
Subbasin (HUC-8)
18040009
Coordinates
37.6663, -120.4421
USGS site number
11289650
Records begin
1970-10-01 (56 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Tuolumne River below Lagrange Dam near Lagrange, 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
177 181 185
175 181 187
173 180 189
170 180 190
168 180 191
163 180 192
155 179 193
148 179 194
143 178 198
137 178 203
130 177 203
124 177 206
120 176 207
128 176 219

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 56 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 126.3 329.6 4,195.2
February 118.6 365.5 5,211
March 138.2 362.4 6,256.5
April 112.9 550.9 7,240
May 12.9 429.5 6,988.1
June 12.6 113.8 4,503.7
July 12.5 107 1,550
August 13.2 101.3 1,139.8
September 10.9 106.2 1,280.1
October 94.5 287.1 1,302.2
November 156.2 256.2 705.3
December 142.2 286.5 2,266.8

All values in cubic feet per second (cfs).

Common questions

When does Tuolumne River below Lagrange Dam near Lagrange, CA normally run highest?
April, on the long-term record. The median daily flow that month is about 550.9 cfs, against 101.3 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 Tuolumne River below Lagrange Dam near Lagrange, CA?
It depends on the month. In January, half of days historically fall near 329.6 cfs, with the middle 80% of days between 126.3 and 4,195.2 cfs. The month-by-month table on this page gives the full range.
How long has Tuolumne River below Lagrange Dam near Lagrange, CA been measured?
Discharge records at USGS site 11289650 begin in 1970, about 56 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 Tuolumne River below Lagrange Dam near Lagrange, 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 Tuolumne River below Lagrange Dam near Lagrange, CA?
The gauge sits at 37.6663, -120.4421, in California, in hydrologic subbasin 18040009, at an elevation of about 173 feet, draining roughly 1,538 square miles.
Can I use Tuolumne River below Lagrange Dam near Lagrange, 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.

Upstream and downstream on the Tuolumne River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Tuolumne River in full.

Other gauges in this subbasin