Rivermatics

USGS Streamgage 12353000

Clark Fork below Missoula, MT

Clark Fork below Missoula, MT is USGS streamgage 12353000 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 9,017 square miles. Discharge records at this site go back to 1929. Typical flow runs near 5,080 cfs in July and 5,651 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
9,017 sq mi
Gauge elevation
3,095 ft
Subbasin (HUC-8)
17010204
Coordinates
46.86863, -114.12775
USGS site number
12353000
Records begin
1929-10-01 (97 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Clark Fork below Missoula, 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
2,634 2,765 2,914
2,530 2,732 2,973
2,447 2,684 2,988
2,369 2,622 2,941
2,298 2,558 2,875
2,244 2,529 2,920
2,193 2,484 2,861
2,143 2,442 2,822
2,083 2,379 2,755
2,033 2,331 2,715
1,991 2,288 2,675
1,950 2,247 2,641
1,918 2,215 2,613
1,887 2,183 2,583

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 96 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 1,383.2 2,059.4 3,311.9
February 1,499 2,232.8 3,696.2
March 1,971.6 2,758.4 4,984.8
April 2,841.3 5,651 11,586.3
May 7,237.1 13,446.5 25,561.3
June 7,049 15,170 28,116.7
July 2,237.1 5,080 9,712.3
August 1,240.3 2,100.3 3,466.1
September 1,341.3 2,119.7 3,283.7
October 1,748.4 2,521.3 3,674.2
November 1,867 2,578.7 3,886.7
December 1,547.1 2,264.8 3,492.3

All values in cubic feet per second (cfs).

Common questions

When does Clark Fork below Missoula, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 15,170 cfs, against 2,059.4 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 below Missoula, MT?
It depends on the month. In January, half of days historically fall near 2,059.4 cfs, with the middle 80% of days between 1,383.2 and 3,311.9 cfs. The month-by-month table on this page gives the full range.
How long has Clark Fork below Missoula, MT been measured?
Discharge records at USGS site 12353000 begin in 1929, about 97 years, covering roughly 9,201 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 below Missoula, 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 below Missoula, MT?
The gauge sits at 46.86863, -114.12775, in Montana, in hydrologic subbasin 17010204, at an elevation of about 3,095 feet, draining roughly 9,017 square miles.
Can I use Clark Fork below Missoula, 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