USGS Streamgage 06335500
Little Missouri River at Marmarth, ND
Little Missouri River at Marmarth, ND is USGS streamgage 06335500 in North Dakota, monitoring river discharge in hydrologic subbasin 10110203. It sits on the Little Missouri River, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 4,670 square miles. Discharge records at this site go back to 1929. Typical flow runs near 86.4 cfs in July and 180.5 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
- North Dakota
- Drainage area
- 4,670 sq mi
- Gauge elevation
- 2,714 ft
- Subbasin (HUC-8)
- 10110203
- Coordinates
- 46.29778, -103.9175
- USGS site number
- 06335500
- Records begin
- 1929-05-29 (97 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Little Missouri River at Marmarth, ND. 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 |
|---|---|---|---|---|
| 0.9 | 1.1 | 1.4 | ||
| 0.9 | 1.2 | 1.6 | ||
| 0.8 | 1.2 | 1.7 | ||
| 0.8 | 1.2 | 1.9 | ||
| 0.8 | 1.3 | 2.1 | ||
| 0.8 | 1.3 | 2.5 | ||
| 0.7 | 1.3 | 2.9 | ||
| 0.7 | 1.3 | 3.5 | ||
| 0.7 | 1.3 | 3.6 | ||
| 0.6 | 1.3 | 3.4 | ||
| 0.6 | 1.3 | 3.3 | ||
| 0.5 | 1.2 | 3 | ||
| 0.6 | 1.3 | 3.1 | ||
| 0.5 | 1.2 | 2.9 |
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 88 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 0 | 3.9 | 46.1 | |
| February | 0 | 17.5 | 352.2 | |
| March | 21 | 193 | 2,748.5 | |
| April | 35.2 | 180.5 | 1,828.1 | |
| May | 20 | 140.6 | 1,676.8 | |
| June | 16.5 | 176.8 | 1,829.2 | |
| July | 7.1 | 86.4 | 497.2 | |
| August | 1.9 | 32.6 | 200.9 | |
| September | 1.8 | 21.4 | 148.3 | |
| October | 5.8 | 25.7 | 226.5 | |
| November | 7.4 | 25.2 | 83.9 | |
| December | 1.4 | 12.2 | 42.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Little Missouri River at Marmarth, ND normally run highest?
- March, on the long-term record. The median daily flow that month is about 193 cfs, against 3.9 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 Little Missouri River at Marmarth, ND?
- It depends on the month. In January, half of days historically fall near 3.9 cfs, with the middle 80% of days between 0 and 46.1 cfs. The month-by-month table on this page gives the full range.
- How long has Little Missouri River at Marmarth, ND been measured?
- Discharge records at USGS site 06335500 begin in 1929, about 97 years, covering roughly 9,133 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Little Missouri River at Marmarth, ND?
- 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 Little Missouri River at Marmarth, ND?
- The gauge sits at 46.29778, -103.9175, in North Dakota, in hydrologic subbasin 10110203, at an elevation of about 2,714 feet, draining roughly 4,670 square miles.
- Can I use Little Missouri River at Marmarth, ND 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 Little Missouri River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Little Missouri River in full.
- Little Missouri River at Camp Crook, SD 1,974 sq mi
- Little Missouri River at Marmarth, ND this page
- Little Missouri River at Medora, ND 6,210 sq mi
- Little Missouri River near Watford City, ND 8,340 sq mi
- Little Missouri River above Mouth near Oakdale, ND 9,040 sq mi