Rivermatics

USGS Streamgage 11230215

SF San Joaquin River below Hooper C near Florence Lake, CA

SF San Joaquin River below Hooper C near Florence Lake, CA is USGS streamgage 11230215 in California, monitoring river discharge in hydrologic subbasin 18040006. It drains a watershed of about 184 square miles. Discharge records at this site go back to 1975. Typical flow runs near 30.4 cfs in July and 29.3 cfs in April, with the higher of the two arriving in July.

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Gauge details

State
California
Drainage area
184 sq mi
Gauge elevation
6,949 ft
Subbasin (HUC-8)
18040006
Coordinates
37.30966, -118.96206
USGS site number
11230215
Records begin
1975-10-01 (51 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 50 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 12.6 17.3 26.7
February 12.3 19.1 31
March 15.1 24.2 41.5
April 16.5 29.3 55.5
May 22.4 37.3 118.5
June 21.9 37.7 1,904
July 22.2 30.4 957.5
August 21.6 28.5 64.1
September 21.4 27.9 38.9
October 13 18.8 34.8
November 12.1 16.2 30.8
December 12.3 16.5 25.6

All values in cubic feet per second (cfs).

Common questions

When does SF San Joaquin River below Hooper C near Florence Lake, CA normally run highest?
June, on the long-term record. The median daily flow that month is about 37.7 cfs, against 16.2 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for SF San Joaquin River below Hooper C near Florence Lake, CA?
It depends on the month. In January, half of days historically fall near 17.3 cfs, with the middle 80% of days between 12.6 and 26.7 cfs. The month-by-month table on this page gives the full range.
How long has SF San Joaquin River below Hooper C near Florence Lake, CA been measured?
Discharge records at USGS site 11230215 begin in 1975, about 51 years, covering roughly 8,821 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is SF San Joaquin River below Hooper C near Florence Lake, CA?
The gauge sits at 37.30966, -118.96206, in California, in hydrologic subbasin 18040006, at an elevation of about 6,949 feet, draining roughly 184 square miles.
Can I use SF San Joaquin River below Hooper C near Florence Lake, 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