USGS Streamgage 06357800
Grand River at Little Eagle, SD
Grand River at Little Eagle, SD is USGS streamgage 06357800 in South Dakota, monitoring river discharge in hydrologic subbasin 10130303. It sits on the Grand River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 5,316 square miles. Discharge records at this site go back to 1958. Typical flow runs near 94.3 cfs in July and 159.1 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
- South Dakota
- Drainage area
- 5,316 sq mi
- Gauge elevation
- 1,629 ft
- Subbasin (HUC-8)
- 10130303
- Coordinates
- 45.65778, -100.81778
- USGS site number
- 06357800
- Records begin
- 1958-08-01 (68 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Grand River at Little Eagle, SD. 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 |
|---|---|---|---|---|
| 25.7 | 27.6 | 29.9 | ||
| 24.4 | 27.6 | 33.3 | ||
| 23.9 | 28.7 | 42.3 | ||
| 24 | 30.1 | 47.8 | ||
| 24 | 31.3 | 51.2 | ||
| 23.2 | 31.1 | 51 | ||
| 23.7 | 32.5 | 55.3 | ||
| 24 | 34.7 | 62.9 | ||
| 23 | 34.3 | 62.1 | ||
| 22.1 | 33.5 | 59.5 | ||
| 20.9 | 32.3 | 57.4 | ||
| 20 | 31.3 | 55.9 | ||
| 19.7 | 31.1 | 56.5 | ||
| 19.9 | 31.9 | 58.5 |
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 68 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 | 21.5 | 86.1 | |
| February | 0.3 | 41.1 | 334.7 | |
| March | 26.6 | 173.3 | 2,280.5 | |
| April | 35.8 | 159.1 | 1,955.7 | |
| May | 26.2 | 146 | 1,338.6 | |
| June | 26.1 | 150.3 | 917.2 | |
| July | 17.4 | 94.3 | 496.4 | |
| August | 12.4 | 66.1 | 268.5 | |
| September | 10.1 | 63.4 | 190.9 | |
| October | 11.8 | 61.6 | 253.8 | |
| November | 11.1 | 51.5 | 170.2 | |
| December | 2.6 | 30.2 | 97.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Grand River at Little Eagle, SD normally run highest?
- March, on the long-term record. The median daily flow that month is about 173.3 cfs, against 21.5 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 Grand River at Little Eagle, SD?
- It depends on the month. In January, half of days historically fall near 21.5 cfs, with the middle 80% of days between 0 and 86.1 cfs. The month-by-month table on this page gives the full range.
- How long has Grand River at Little Eagle, SD been measured?
- Discharge records at USGS site 06357800 begin in 1958, about 68 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Grand River at Little Eagle, SD?
- 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 Grand River at Little Eagle, SD?
- The gauge sits at 45.65778, -100.81778, in South Dakota, in hydrologic subbasin 10130303, at an elevation of about 1,629 feet, draining roughly 5,316 square miles.
- Can I use Grand River at Little Eagle, SD 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 Grand River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Grand River in full.
- Grand River at Little Eagle, SD this page
- Grand River near Thunder Hawk, SD