USGS Streamgage 06400000
Hat Creek near Edgemont, SD
Hat Creek near Edgemont, SD is USGS streamgage 06400000 in South Dakota, monitoring river discharge in hydrologic subbasin 10120108. It drains a watershed of about 959 square miles. Discharge records at this site go back to 1905. Typical flow runs near 0.8 cfs in July and 3.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- South Dakota
- Drainage area
- 959 sq mi
- Gauge elevation
- 3,309 ft
- Subbasin (HUC-8)
- 10120108
- Coordinates
- 43.24, -103.58778
- USGS site number
- 06400000
- Records begin
- 1905-08-12 (121 years)
14-day flow forecast
Based on observations through for Hat Creek near Edgemont, 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 |
|---|---|---|---|---|
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 | ||
| 0 | 0 | 0 |
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 76 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 | 0.5 | 6.4 | |
| February | 0 | 1.4 | 12.8 | |
| March | 0.1 | 3.4 | 54.2 | |
| April | 0.1 | 3.5 | 62.1 | |
| May | 0.1 | 3.6 | 117.3 | |
| June | 0 | 5.2 | 153.1 | |
| July | 0 | 0.8 | 33.2 | |
| August | 0 | 0.1 | 7 | |
| September | 0 | 0 | 1.8 | |
| October | 0 | 0 | 6.7 | |
| November | 0 | 0.5 | 5.8 | |
| December | 0 | 0.7 | 5 |
All values in cubic feet per second (cfs).
Common questions
- When does Hat Creek near Edgemont, SD normally run highest?
- June, on the long-term record. The median daily flow that month is about 5.2 cfs, against 0 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Hat Creek near Edgemont, SD?
- It depends on the month. In January, half of days historically fall near 0.5 cfs, with the middle 80% of days between 0 and 6.4 cfs. The month-by-month table on this page gives the full range.
- How long has Hat Creek near Edgemont, SD been measured?
- Discharge records at USGS site 06400000 begin in 1905, about 121 years, covering roughly 9,136 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Hat Creek near Edgemont, SD?
- The gauge sits at 43.24, -103.58778, in South Dakota, in hydrologic subbasin 10120108, at an elevation of about 3,309 feet, draining roughly 959 square miles.
- Can I use Hat Creek near Edgemont, 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.