Rivermatics

USGS Streamgage 12354500

Clark Fork at St. Regis, MT

Clark Fork at St. Regis, MT is USGS streamgage 12354500 in Montana, monitoring river discharge in hydrologic subbasin 17010204. It sits on the Clark Fork, alongside 12 other gauges Rivermatics tracks on the same river. It drains a watershed of about 10,728 square miles. Discharge records at this site go back to 1910. Typical flow runs near 6,738.1 cfs in July and 8,135 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
Montana
Drainage area
10,728 sq mi
Gauge elevation
2,611 ft
Subbasin (HUC-8)
17010204
Coordinates
47.30164, -115.08687
USGS site number
12354500
Records begin
1910-11-01 (116 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Clark Fork at St. Regis, MT. 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
3,532 3,721 3,942
3,408 3,705 4,101
3,322 3,668 4,175
3,235 3,608 4,158
3,151 3,540 4,083
3,092 3,513 4,150
3,029 3,454 4,064
2,967 3,407 4,032
2,880 3,313 3,927
2,803 3,231 3,835
2,748 3,171 3,773
2,708 3,129 3,736
2,660 3,078 3,689
2,615 3,029 3,635

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 97 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 1,927.7 2,732.3 4,632.6
February 2,072.8 2,975.5 5,278.3
March 2,572.3 3,755.8 7,113.9
April 4,046 8,135 16,196.7
May 10,045.2 18,045.2 33,067.7
June 9,005.3 19,110 35,530
July 3,110.6 6,738.1 12,324.2
August 1,839.4 2,896.5 4,519.7
September 1,833.7 2,777.3 4,045
October 2,195.2 3,143.2 4,520.3
November 2,376.7 3,268 5,115.7
December 2,086.8 2,976.8 4,888.4

All values in cubic feet per second (cfs).

Common questions

When does Clark Fork at St. Regis, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 19,110 cfs, against 2,732.3 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Clark Fork at St. Regis, MT?
It depends on the month. In January, half of days historically fall near 2,732.3 cfs, with the middle 80% of days between 1,927.7 and 4,632.6 cfs. The month-by-month table on this page gives the full range.
How long has Clark Fork at St. Regis, MT been measured?
Discharge records at USGS site 12354500 begin in 1910, about 116 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 Clark Fork at St. Regis, MT?
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 Clark Fork at St. Regis, MT?
The gauge sits at 47.30164, -115.08687, in Montana, in hydrologic subbasin 17010204, at an elevation of about 2,611 feet, draining roughly 10,728 square miles.
Can I use Clark Fork at St. Regis, MT 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 Clark Fork

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

Other gauges in this subbasin