Rivermatics

USGS Streamgage 11276600

Tuolumne River Ab Early Intake near Mather, CA

Tuolumne River Ab Early Intake near Mather, CA is USGS streamgage 11276600 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 484 square miles. Discharge records at this site go back to 1943. Typical flow runs near 140.7 cfs in July and 156.9 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.

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Gauge details

State
California
Drainage area
484 sq mi
Gauge elevation
2,406 ft
Subbasin (HUC-8)
18040009
Coordinates
37.87935, -119.94709
USGS site number
11276600
Records begin
1943-06-01 (83 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Tuolumne River Ab Early Intake near Mather, 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
49.8 58.2 63.5
46.3 56.4 64.9
43.4 54.9 65.5
41.7 54.1 66.4
40.6 53.8 67.1
39.3 53.2 67.1
38.6 52.9 67.2
37.9 52.5 67.1
37.7 52.6 67.8
38.5 53.2 69.6
37.3 52.7 69.6
36.7 52.2 68.4
36.4 51.9 67.9
36.5 52 68.4

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 42.5 72.2 290.1
February 48.3 97.6 316.3
March 51.4 120.7 369.3
April 48.6 156.9 1,141.5
May 64.5 351.1 3,993.9
June 80.8 734.8 5,238.7
July 78.6 140.7 2,830
August 79.2 129.3 226.8
September 59.9 86.6 116.8
October 37.6 54.2 73.8
November 38.4 59.5 89
December 41.2 60 155.9

All values in cubic feet per second (cfs).

Common questions

When does Tuolumne River Ab Early Intake near Mather, CA normally run highest?
June, on the long-term record. The median daily flow that month is about 734.8 cfs, against 54.2 cfs in October, 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 Ab Early Intake near Mather, CA?
It depends on the month. In January, half of days historically fall near 72.2 cfs, with the middle 80% of days between 42.5 and 290.1 cfs. The month-by-month table on this page gives the full range.
How long has Tuolumne River Ab Early Intake near Mather, CA been measured?
Discharge records at USGS site 11276600 begin in 1943, about 83 years, covering roughly 9,077 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 Ab Early Intake near Mather, 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 Ab Early Intake near Mather, CA?
The gauge sits at 37.87935, -119.94709, in California, in hydrologic subbasin 18040009, at an elevation of about 2,406 feet, draining roughly 484 square miles.
Can I use Tuolumne River Ab Early Intake near Mather, 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