Musselshell River At Harlowton flow report
As of July 15, 2026, Musselshell River At Harlowton is flowing at 63 cfs with a gage height of 3.11 ft, holding steady over the past 24 hours. Source: USGS gauge #06120500, refreshed throughout the day.
Historical Data
Musselshell River At Harlowton at a glance
How Musselshell River At Harlowton is running right now, where it sits on the map, and the key gauge stats.
Musselshell River At Harlowton is flowing at 63 cfs, with the water sitting 3.11 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #06120500 in Montana. Over the past 10 days the average has been 85 cfs, peaking at 106 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Montana flow report.
Streamflow Forecast
Over the next 5 days, Musselshell River At Harlowton Mt is expected to hold near today's 65 cfs, toward roughly 60 cfs by 2026-07-19 (likely range 27-130 cfs) -- running well below the seasonal normal.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Musselshell River At Harlowton
The river has several tributaries, including the Dry Fork and Big Spring Creek, and is dammed at several points along its course. Seasonally, the Musselshell River experiences high water levels in the spring due to snowmelt and low water levels in the summer and fall. Interestingly, the Musselshell River was named after the abundance of freshwater mussels found in the river by early explorers. The river also played a significant role in the history of Montana, serving as a transportation route for settlers and a source of irrigation for agriculture.
Nearby streamflow levels
Cross-check Musselshell River At Harlowton's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Musselshell River At Harlowton Mt | 63 cfs |
| Musselshell River Ab Mud Cr Nr Shawmut Mt | 34 cfs |
| Musselshell River Nr Martinsdale | 53 cfs |
| South Fork Musselshell R Ab Martinsdale Mt | 43 cfs |
| Boulder River At Big Timber Mt | 490 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Musselshell River At Harlowton. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Twodot E | 0 in |
| Judith Gap | 0 in |
| Nohrsc Daisy Peak | — |
| Daisy Peak | 0 in |
| Crystal Lake | 0 in |
River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Musselshell River At Harlowton in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Musselshell River At Harlowton crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Musselshell River At Harlowton
Where does the streamflow data for Musselshell River At Harlowton come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 06120500. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Musselshell River At Harlowton rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Musselshell River At Harlowton report
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