Rivermatics

USGS Streamgage 11078000

Santa Ana River A Santa Ana, CA

Santa Ana River A Santa Ana, CA is USGS streamgage 11078000 in California, monitoring river discharge in hydrologic subbasin 18070203. It drains a watershed of about 1,700 square miles. Discharge records at this site go back to 1923. Typical flow runs near 0 cfs in July and 0 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
California
Drainage area
1,700 sq mi
Gauge elevation
66 ft
Subbasin (HUC-8)
18070203
Coordinates
33.75113, -117.90839
USGS site number
11078000
Records begin
1923-01-31 (103 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 87 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 0 0 255.8
February 0 0 780.6
March 0 0 616.9
April 0 0 184.6
May 0 0 9.2
June 0 0 0.1
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 0.2
November 0 0 5.9
December 0 0 59.4

All values in cubic feet per second (cfs).

Common questions

When does Santa Ana River A Santa Ana, CA normally run highest?
January, on the long-term record. The median daily flow that month is about 0 cfs, against 0 cfs in January, 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 A Santa Ana, CA?
It depends on the month. In January, half of days historically fall near 0 cfs, with the middle 80% of days between 0 and 255.8 cfs. The month-by-month table on this page gives the full range.
How long has Santa Ana River A Santa Ana, CA been measured?
Discharge records at USGS site 11078000 begin in 1923, about 103 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 A Santa Ana, CA?
The gauge sits at 33.75113, -117.90839, in California, in hydrologic subbasin 18070203, at an elevation of about 66 feet, draining roughly 1,700 square miles.
Can I use Santa Ana River A Santa Ana, 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