Rivermatics

USGS Streamgage 12179000

Skagit River above Alma Creek near Marblemount, WA

Skagit River above Alma Creek near Marblemount, WA is USGS streamgage 12179000 in Washington, monitoring river discharge in hydrologic subbasin 17110005. It sits on the Skagit River, alongside 11 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,274 square miles. Discharge records at this site go back to 1950. Typical flow runs near 6,333.5 cfs in July and 4,591.3 cfs in April, with the higher of the two arriving in July.

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Gauge details

State
Washington
Drainage area
1,274 sq mi
Gauge elevation
407 ft
Subbasin (HUC-8)
17110005
Coordinates
48.60734, -121.36152
USGS site number
12179000
Records begin
1950-10-01 (76 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 76 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 3,722.6 5,729.4 7,716.8
February 3,402.4 5,640 7,750.7
March 3,063.9 5,059.7 6,973.9
April 2,873 4,591.3 6,688.7
May 2,870.3 4,669.4 7,962.3
June 3,179 5,813.7 12,473.3
July 3,202.3 6,333.5 12,551.9
August 2,614.2 4,001.9 6,465.8
September 1,967.7 3,402.3 4,962.3
October 2,066.8 3,672.6 6,230.6
November 3,038.3 4,940.7 9,069.3
December 3,467.7 5,225.2 8,189

All values in cubic feet per second (cfs).

Common questions

When does Skagit River above Alma Creek near Marblemount, WA normally run highest?
July, on the long-term record. The median daily flow that month is about 6,333.5 cfs, against 3,402.3 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Skagit River above Alma Creek near Marblemount, WA?
It depends on the month. In January, half of days historically fall near 5,729.4 cfs, with the middle 80% of days between 3,722.6 and 7,716.8 cfs. The month-by-month table on this page gives the full range.
How long has Skagit River above Alma Creek near Marblemount, WA been measured?
Discharge records at USGS site 12179000 begin in 1950, about 76 years, covering roughly 2,154 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is Skagit River above Alma Creek near Marblemount, WA?
The gauge sits at 48.60734, -121.36152, in Washington, in hydrologic subbasin 17110005, at an elevation of about 407 feet, draining roughly 1,274 square miles.
Can I use Skagit River above Alma Creek near Marblemount, WA 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.

Upstream and downstream on the Skagit River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Skagit River in full.

Other gauges in this subbasin