5 USGS Streamgages · Mississippi River system
Little Missouri River flows and levels
Little Missouri River is gauged at 5 USGS streamgages in South Dakota and North Dakota, each tracked by Rivermatics. The mainstem runs about 656 miles (1,056 km) from headwaters to outlet. It drains into the Mississippi River system. Drainage area at the gauges ranges from 1,974 square miles at Little Missouri River at Camp Crook, SD up to 9,040 at Little Missouri River above Mouth near Oakdale, ND. The gauged reach falls about 1,249 feet, from 3,099 feet down to 1,849. Rivermatics issues a daily machine-learned 14-day flow outlook at 4 of them.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| Little Missouri River at Camp Crook, SD | SD | 1,974 | 3,099 | 45.8 | 25.5 | 14-day |
| Little Missouri River at Marmarth, ND | ND | 4,670 | 2,714 | 180.5 | 86.4 | 14-day |
| Little Missouri River at Medora, ND | ND | 6,210 | 2,269 | 273.5 | 177.1 | — |
| Little Missouri River near Watford City, ND | ND | 8,340 | 1,938 | 453.2 | 237.9 | 14-day |
| Little Missouri River above Mouth near Oakdale, ND | ND | 9,040 | 1,849 | — | — | 14-day |
Common questions
- How many gauges are on the Little Missouri River?
- Rivermatics tracks 5 USGS streamgages on the Little Missouri River, across South Dakota and North Dakota. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- Is there a flow forecast for the Little Missouri River?
- Yes, at 4 of the 5 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily 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 each gauge's live screen.
- What river system is the Little Missouri River part of?
- The Little Missouri River drains into the Mississippi River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Little Missouri River 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.
Other rivers in the Mississippi River system
- Missouri River 52 gauges
- Big Sioux River 17 gauges
- James River 15 gauges
- Kansas River 12 gauges
- Smoky Hill River 12 gauges
- Platte River 11 gauges
- Rapid Creek 11 gauges
- Republican River 11 gauges