Rivermatics

USGS Streamgage 06130500

Musselshell River at Mosby, MT

Musselshell River at Mosby, MT is USGS streamgage 06130500 in Montana, monitoring river discharge in hydrologic subbasin 10040205. It sits on the Musselshell River, alongside 6 other gauges Rivermatics tracks on the same river. It drains a watershed of about 7,784 square miles. Discharge records at this site go back to 1929. Typical flow runs near 114.9 cfs in July and 135.4 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.

View live conditions & forecast →

Gauge details

State
Montana
Drainage area
7,784 sq mi
Gauge elevation
2,500 ft
Subbasin (HUC-8)
10040205
Coordinates
46.99469, -107.88916
USGS site number
06130500
Records begin
1929-05-01 (97 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Musselshell River at Mosby, 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
39.1 47.9 58.6
29.7 42.1 60.6
23.1 37 59.8
18.3 32.7 58
15 29.8 56.7
12.4 27.4 54.8
10.9 26.6 56.5
9.3 26.3 61.3
7.7 25.5 65.5
6.1 23.2 62.4
5 21.6 60.5
4.1 20 57.9
3.8 20.1 60.4
2.9 17.9 56.8

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 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 0.9 50.4 200.7
February 4.5 80.4 356.8
March 29.2 165.5 948.4
April 15.2 135.4 790.7
May 5.1 203 1,543.9
June 15.4 338.8 2,678
July 0.4 114.9 986.5
August 0 61.6 293.5
September 0 64.4 263.3
October 0 66.9 219.3
November 0.1 66.9 208.9
December 0.5 54.5 192

All values in cubic feet per second (cfs).

Common questions

When does Musselshell River at Mosby, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 338.8 cfs, against 50.4 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 Musselshell River at Mosby, MT?
It depends on the month. In January, half of days historically fall near 50.4 cfs, with the middle 80% of days between 0.9 and 200.7 cfs. The month-by-month table on this page gives the full range.
How long has Musselshell River at Mosby, MT been measured?
Discharge records at USGS site 06130500 begin in 1929, about 97 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 Musselshell River at Mosby, 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 Musselshell River at Mosby, MT?
The gauge sits at 46.99469, -107.88916, in Montana, in hydrologic subbasin 10040205, at an elevation of about 2,500 feet, draining roughly 7,784 square miles.
Can I use Musselshell River at Mosby, 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 Musselshell River

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

Other gauges in this region