Rivermatics

USGS Streamgage 12095000

South Prairie Creek at South Prairie, WA

South Prairie Creek at South Prairie, WA is USGS streamgage 12095000 in Washington, monitoring river discharge in hydrologic subbasin 17110014. It drains a watershed of about 80 square miles. Discharge records at this site go back to 1950. Typical flow runs near 79.3 cfs in July and 245.5 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
Washington
Drainage area
80 sq mi
Gauge elevation
439 ft
Subbasin (HUC-8)
17110014
Coordinates
47.13955, -122.09261
USGS site number
12095000
Records begin
1950-03-04 (76 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for South Prairie Creek at South Prairie, WA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
28.2 29.4 30.4
28.4 30.5 33.9
39 66.6 153
40.2 64.4 112
37.8 55.7 89.9
34.3 45.6 65.4
32.1 41.2 56.8
29.7 37.4 51.5
28.7 35.4 46.9
27.8 34.3 44.8
27.6 33.6 42.8
26.5 32.2 40.7
25.9 31.3 39.4
25.6 31 38.7

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 77 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 124.6 279.9 808.2
February 124 234.8 635.8
March 130.4 233.2 486.7
April 152.8 245.5 492.6
May 128.6 234.5 426
June 86.1 175.1 390
July 47.2 79.3 175.7
August 30.9 45.7 92.9
September 29 44.9 119
October 37.5 84.5 295
November 78.7 199.9 626.6
December 112.4 251.8 688.1

All values in cubic feet per second (cfs).

Common questions

When does South Prairie Creek at South Prairie, WA normally run highest?
January, on the long-term record. The median daily flow that month is about 279.9 cfs, against 44.9 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 South Prairie Creek at South Prairie, WA?
It depends on the month. In January, half of days historically fall near 279.9 cfs, with the middle 80% of days between 124.6 and 808.2 cfs. The month-by-month table on this page gives the full range.
How long has South Prairie Creek at South Prairie, WA been measured?
Discharge records at USGS site 12095000 begin in 1950, about 76 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for South Prairie Creek at South Prairie, WA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is South Prairie Creek at South Prairie, WA?
The gauge sits at 47.13955, -122.09261, in Washington, in hydrologic subbasin 17110014, at an elevation of about 439 feet, draining roughly 80 square miles.
Can I use South Prairie Creek at South Prairie, 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.

Other gauges in this subbasin