Rivermatics

USGS Streamgage 12091500

Chambers Creek below Leach Creek near Steilacoom, WA

Chambers Creek below Leach Creek near Steilacoom, WA is USGS streamgage 12091500 in Washington, monitoring river discharge in hydrologic subbasin 17110019. It drains a watershed of about 104 square miles. Discharge records at this site go back to 1937. Typical flow runs near 57.8 cfs in July and 143.3 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.

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Gauge details

State
Washington
Drainage area
104 sq mi
Gauge elevation
98 ft
Subbasin (HUC-8)
17110019
Coordinates
47.19757, -122.52872
USGS site number
12091500
Records begin
1937-12-29 (89 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Chambers Creek below Leach Creek near Steilacoom, 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
43.2 44.6 45.9
42.8 44.7 46.7
47.2 57.2 86.6
43.1 49.1 64.9
42.2 47.7 59.3
41 46.5 55.7
40.2 45.7 53.5
39.6 45.3 53
38.9 44.8 52.4
38 44.3 51.5
37.6 44.1 51.3
36.9 43.8 51.1
36.6 43.6 51.4
35.5 43.1 50.8

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 89 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 77.9 168.6 333.5
February 91.2 184.2 304.9
March 94.9 173.2 322.9
April 81.7 143.3 225.8
May 67.6 109.6 169.8
June 52.6 80.8 117.9
July 38.3 57.8 81
August 32.9 43.6 61.1
September 31.9 41.9 61.4
October 35.5 49.7 85.5
November 43.6 71 140.3
December 53.6 110.6 233.8

All values in cubic feet per second (cfs).

Common questions

When does Chambers Creek below Leach Creek near Steilacoom, WA normally run highest?
February, on the long-term record. The median daily flow that month is about 184.2 cfs, against 41.9 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 Chambers Creek below Leach Creek near Steilacoom, WA?
It depends on the month. In January, half of days historically fall near 168.6 cfs, with the middle 80% of days between 77.9 and 333.5 cfs. The month-by-month table on this page gives the full range.
How long has Chambers Creek below Leach Creek near Steilacoom, WA been measured?
Discharge records at USGS site 12091500 begin in 1937, about 89 years, covering roughly 9,192 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Chambers Creek below Leach Creek near Steilacoom, 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 Chambers Creek below Leach Creek near Steilacoom, WA?
The gauge sits at 47.19757, -122.52872, in Washington, in hydrologic subbasin 17110019, at an elevation of about 98 feet, draining roughly 104 square miles.
Can I use Chambers Creek below Leach Creek near Steilacoom, 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