Rivermatics

USGS Streamgage 11422500

Bear River below Rollins Dam near Colfax, CA

Bear River below Rollins Dam near Colfax, CA is USGS streamgage 11422500 in California, monitoring river discharge in hydrologic subbasin 18020126. It drains a watershed of about 105 square miles. Discharge records at this site go back to 1912. Typical flow runs near 140.6 cfs in July and 545.4 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
California
Drainage area
105 sq mi
Gauge elevation
1,927 ft
Subbasin (HUC-8)
18020126
Coordinates
39.13128, -120.95911
USGS site number
11422500
Records begin
1912-04-01 (114 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 114 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 21.5 370.3 1,581.3
February 21.3 491.1 1,604.8
March 22.6 574.1 1,619.7
April 38.2 545.4 1,265
May 81.7 440.9 939.6
June 76.5 253.1 605
July 61 140.6 429.6
August 53.9 137.6 342.8
September 52.3 101.7 291.5
October 43.6 82.5 204.8
November 20.1 42.3 563.4
December 20.5 121.4 1,016.8

All values in cubic feet per second (cfs).

Common questions

When does Bear River below Rollins Dam near Colfax, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 574.1 cfs, against 42.3 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 Bear River below Rollins Dam near Colfax, CA?
It depends on the month. In January, half of days historically fall near 370.3 cfs, with the middle 80% of days between 21.5 and 1,581.3 cfs. The month-by-month table on this page gives the full range.
How long has Bear River below Rollins Dam near Colfax, CA been measured?
Discharge records at USGS site 11422500 begin in 1912, about 114 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 Bear River below Rollins Dam near Colfax, CA?
The gauge sits at 39.13128, -120.95911, in California, in hydrologic subbasin 18020126, at an elevation of about 1,927 feet, draining roughly 105 square miles.
Can I use Bear River below Rollins Dam near Colfax, 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