Rivermatics

USGS Streamgage 11276900

Tuolumne River below Early Intake near Mather, CA

Tuolumne River below Early Intake near Mather, CA is USGS streamgage 11276900 in California, monitoring river discharge in hydrologic subbasin 18040009. It drains a watershed of about 487 square miles. Discharge records at this site go back to 1966. Typical flow runs near 180.4 cfs in July and 508 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
California
Drainage area
487 sq mi
Gauge elevation
2,221 ft
Subbasin (HUC-8)
18040009
Coordinates
37.88158, -119.97015
USGS site number
11276900
Records begin
1966-10-01 (60 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 59 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 42.3 95.1 605.5
February 46.4 143.6 951.9
March 55 290.2 1,049.7
April 49.2 508 1,538.1
May 66.1 1,031 4,677.7
June 77.6 1,337.2 5,529
July 75.9 180.4 3,112.6
August 77.9 132.5 321.8
September 64.6 91.2 166.4
October 37.4 58.8 137.2
November 37.2 62.2 182.5
December 41.3 67.9 245.3

All values in cubic feet per second (cfs).

Common questions

When does Tuolumne River below Early Intake near Mather, CA normally run highest?
June, on the long-term record. The median daily flow that month is about 1,337.2 cfs, against 58.8 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 below Early Intake near Mather, CA?
It depends on the month. In January, half of days historically fall near 95.1 cfs, with the middle 80% of days between 42.3 and 605.5 cfs. The month-by-month table on this page gives the full range.
How long has Tuolumne River below Early Intake near Mather, CA been measured?
Discharge records at USGS site 11276900 begin in 1966, about 60 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is Tuolumne River below Early Intake near Mather, CA?
The gauge sits at 37.88158, -119.97015, in California, in hydrologic subbasin 18040009, at an elevation of about 2,221 feet, draining roughly 487 square miles.
Can I use Tuolumne River below 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.

Other gauges in this subbasin