Rivermatics

USGS Streamgage 14015000

Mill Creek at Walla Walla, WA

Mill Creek at Walla Walla, WA is USGS streamgage 14015000 in Washington, monitoring river discharge in hydrologic subbasin 17070102. It sits on the Mill Creek, alongside 3 other gauges Rivermatics tracks on the same river. It drains a watershed of about 96 square miles. Discharge records at this site go back to 1941. Typical flow runs near 2.6 cfs in July and 136.2 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
96 sq mi
Subbasin (HUC-8)
17070102
Coordinates
46.07625, -118.27357
USGS site number
14015000
Records begin
1941-04-11 (85 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Mill Creek at Walla Walla, 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
7.2 9.9 12.8
5.7 9.7 14
8.5 14.5 24.7
7.9 13.7 23.6
6 11.7 19.5
4.9 10.7 18.2
4.7 10.4 18.1
4.3 10 18
4.2 9.7 17.6
4.3 9.8 18
3.9 9.5 17.6
3.7 9.3 17.7
3.4 9.1 17.6
3.5 9.2 17.8

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 86 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 28 91.5 356
February 40.5 111.5 373.6
March 47.8 142.1 377.9
April 53 136.2 344.6
May 16.6 81.8 206.4
June 0.7 20.6 113.9
July 0 2.6 10.7
August 0 1.8 6.7
September 0 1.6 11.9
October 0 2.8 24.8
November 1.3 22.5 119.7
December 10.2 66.4 258

All values in cubic feet per second (cfs).

Common questions

When does Mill Creek at Walla Walla, WA normally run highest?
March, on the long-term record. The median daily flow that month is about 142.1 cfs, against 1.6 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 Mill Creek at Walla Walla, WA?
It depends on the month. In January, half of days historically fall near 91.5 cfs, with the middle 80% of days between 28 and 356 cfs. The month-by-month table on this page gives the full range.
How long has Mill Creek at Walla Walla, WA been measured?
Discharge records at USGS site 14015000 begin in 1941, about 85 years, covering roughly 9,198 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Mill Creek at Walla Walla, 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 Mill Creek at Walla Walla, WA?
The gauge sits at 46.07625, -118.27357, in Washington, in hydrologic subbasin 17070102, draining roughly 96 square miles.
Can I use Mill Creek at Walla Walla, 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 Mill Creek

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

Other gauges in this subbasin