Rivermatics

USGS Streamgage 09429600

Colorado River below Laguna Dam, Az-Ca

Colorado River below Laguna Dam, Az-Ca is USGS streamgage 09429600 in California, monitoring river discharge in hydrologic subbasin 15030107. It drains a watershed of about 188,600 square miles. Discharge records at this site go back to 1971. Typical flow runs near 449.9 cfs in July and 498.7 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
California
Drainage area
188,600 sq mi
Gauge elevation
123 ft
Subbasin (HUC-8)
15030107
Coordinates
32.81227, -114.51495
USGS site number
09429600
Records begin
1971-12-16 (55 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 55 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 283 419.3 3,203.9
February 273.8 405.3 3,559.3
March 338.5 472.3 2,316.5
April 361 498.7 2,120.7
May 350.2 485.7 1,467.4
June 339.8 456 1,474.3
July 340.5 449.9 1,793.2
August 340.9 477.7 2,063.2
September 315.9 483 2,083.7
October 268.2 385.6 1,848.4
November 271.9 387.5 1,823.3
December 268.5 404.5 2,837.4

All values in cubic feet per second (cfs).

Common questions

When does Colorado River below Laguna Dam, Az-Ca normally run highest?
April, on the long-term record. The median daily flow that month is about 498.7 cfs, against 385.6 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 Colorado River below Laguna Dam, Az-Ca?
It depends on the month. In January, half of days historically fall near 419.3 cfs, with the middle 80% of days between 283 and 3,203.9 cfs. The month-by-month table on this page gives the full range.
How long has Colorado River below Laguna Dam, Az-Ca been measured?
Discharge records at USGS site 09429600 begin in 1971, about 55 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 Colorado River below Laguna Dam, Az-Ca?
The gauge sits at 32.81227, -114.51495, in California, in hydrologic subbasin 15030107, at an elevation of about 123 feet, draining roughly 188,600 square miles.
Can I use Colorado River below Laguna Dam, Az-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