USGS Streamgage 06123030
Musselshell River ab Mud Creek near Shawmut, MT
Musselshell River ab Mud Creek near Shawmut, MT is USGS streamgage 06123030 in Montana, monitoring river discharge in hydrologic subbasin 10040201. It sits on the Musselshell River, alongside 6 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,518 square miles. Discharge records at this site go back to 1998. Typical flow runs near 62 cfs in July and 17 cfs in April, with the higher of the two arriving in July. 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
- 1,518 sq mi
- Gauge elevation
- 3,782 ft
- Subbasin (HUC-8)
- 10040201
- Coordinates
- 46.31899, -109.46055
- USGS site number
- 06123030
- Records begin
- 1998-06-01 (28 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Musselshell River ab Mud Creek near Shawmut, 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.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 7.6 | 10.4 | 14.2 | ||
| 6.4 | 11.6 | 19.7 | ||
| 5.7 | 11.6 | 20.9 | ||
| 4.8 | 10.9 | 20.5 | ||
| 3.9 | 10.3 | 20.8 | ||
| 3.7 | 10.2 | 21.6 | ||
| 3.3 | 10 | 22.7 | ||
| 3.1 | 9.9 | 23.4 | ||
| 3.3 | 10 | 23.4 | ||
| 3.7 | 10.3 | 24.5 | ||
| 4.3 | 10.9 | 26 | ||
| 3.3 | 9.3 | 23.8 | ||
| 3.2 | 8.6 | 21.7 | ||
| 3.5 | 9.1 | 22.9 |
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 27 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 9 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| March | — | 9.2 | — | |
| April | 5 | 17 | 301 | |
| May | 14.8 | 114.7 | 1,104.1 | |
| June | 33.2 | 165.2 | 1,444.9 | |
| July | 16.2 | 62 | 452.9 | |
| August | 5.8 | 35.5 | 121.7 | |
| September | 4.6 | 36.8 | 135.8 | |
| October | 5.6 | 36.2 | 132 | |
| November | — | 59.5 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Musselshell River ab Mud Creek near Shawmut, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 165.2 cfs, against 9.2 cfs in March, 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 ab Mud Creek near Shawmut, MT?
- It depends on the month. In April, half of days historically fall near 17 cfs, with the middle 80% of days between 5 and 301 cfs. The month-by-month table on this page gives the full range.
- How long has Musselshell River ab Mud Creek near Shawmut, MT been measured?
- Discharge records at USGS site 06123030 begin in 1998, about 28 years, covering roughly 5,448 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 ab Mud Creek near Shawmut, 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 ab Mud Creek near Shawmut, MT?
- The gauge sits at 46.31899, -109.46055, in Montana, in hydrologic subbasin 10040201, at an elevation of about 3,782 feet, draining roughly 1,518 square miles.
- Can I use Musselshell River ab Mud Creek near Shawmut, 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.
- Musselshell River near Martinsdale, MT 537 sq mi
- Musselshell River at Harlowton, MT 1,108 sq mi
- Musselshell River ab Mud Creek near Shawmut, MT this page
- Musselshell River ab Big Coulee Creek at Lavina, MT 2,691 sq mi
- Musselshell River near Roundup, MT 3,998 sq mi
- Musselshell River at Musselshell, MT 4,534 sq mi
- Musselshell River at Mosby, MT 7,784 sq mi