Rivermatics

USGS Streamgage 12324400

Clark Fork ab Little Blackfoot River near Garrison, MT

Clark Fork ab Little Blackfoot River near Garrison, MT is USGS streamgage 12324400 in Montana, monitoring river discharge in hydrologic subbasin 17010201. It sits on the Clark Fork, alongside 12 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,130 square miles. Discharge records at this site go back to 2009. Typical flow runs near 219.2 cfs in July and 309.6 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, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Montana
Drainage area
1,130 sq mi
Gauge elevation
4,355 ft
Subbasin (HUC-8)
17010201
Coordinates
46.51091, -112.78969
USGS site number
12324400
Records begin
2009-03-01 (17 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Clark Fork ab Little Blackfoot River near Garrison, 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
119 125 131
113 121 131
110 119 131
106 117 130
104 116 130
105 119 140
105 120 144
103 119 143
102 119 147
100 119 151
99.4 119 158
96.5 115 144
95.3 114 144
93.8 112 142

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 17 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 159.5 264.1 320.4
February 164.8 253.9 327.1
March 226.3 280.6 427.5
April 207.7 309.6 566.3
May 169.6 412.1 1,104.7
June 210.6 580.9 1,721
July 93.1 219.2 780.9
August 66.2 125.6 265.8
September 87.4 155.5 267.2
October 150 246.5 372.6
November 196 280.9 376
December 173.4 266.2 328.8

All values in cubic feet per second (cfs).

Common questions

When does Clark Fork ab Little Blackfoot River near Garrison, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 580.9 cfs, against 125.6 cfs in August, 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 ab Little Blackfoot River near Garrison, MT?
It depends on the month. In January, half of days historically fall near 264.1 cfs, with the middle 80% of days between 159.5 and 320.4 cfs. The month-by-month table on this page gives the full range.
How long has Clark Fork ab Little Blackfoot River near Garrison, MT been measured?
Discharge records at USGS site 12324400 begin in 2009, about 17 years, covering roughly 6,367 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 ab Little Blackfoot River near Garrison, 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. A companion model forecasts each day's water-temperature high and low. 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 ab Little Blackfoot River near Garrison, MT?
The gauge sits at 46.51091, -112.78969, in Montana, in hydrologic subbasin 17010201, at an elevation of about 4,355 feet, draining roughly 1,130 square miles.
Can I use Clark Fork ab Little Blackfoot River near Garrison, 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