Rivermatics

USGS Streamgage 11074000

Santa Ana River below Prado Dam, CA

Santa Ana River below Prado Dam, CA is USGS streamgage 11074000 in California, monitoring river discharge in hydrologic subbasin 18070203. It drains a watershed of about 2,258 square miles. Discharge records at this site go back to 1938. Typical flow runs near 93 cfs in July and 190.4 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
California
Drainage area
2,258 sq mi
Gauge elevation
452 ft
Subbasin (HUC-8)
18070203
Coordinates
33.88335, -117.64533
USGS site number
11074000
Records begin
1938-03-02 (88 years)

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 67.4 221.8 563
February 75.9 223.3 871.9
March 70.9 237.6 834.6
April 60.7 190.4 561
May 48.2 142.6 388.4
June 40.9 119.2 318.3
July 27.4 93 249.5
August 22.9 79.1 202.7
September 25.9 85.2 191.9
October 33.1 96.8 214.7
November 46.7 127.4 271.9
December 58.6 183.2 451

All values in cubic feet per second (cfs).

Common questions

When does Santa Ana River below Prado Dam, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 237.6 cfs, against 79.1 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 Santa Ana River below Prado Dam, CA?
It depends on the month. In January, half of days historically fall near 221.8 cfs, with the middle 80% of days between 67.4 and 563 cfs. The month-by-month table on this page gives the full range.
How long has Santa Ana River below Prado Dam, CA been measured?
Discharge records at USGS site 11074000 begin in 1938, about 88 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 Santa Ana River below Prado Dam, CA?
The gauge sits at 33.88335, -117.64533, in California, in hydrologic subbasin 18070203, at an elevation of about 452 feet, draining roughly 2,258 square miles.
Can I use Santa Ana River below Prado Dam, 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