USGS Streamgage 06464100
Keya Paha River near Keyapaha, SD
Keya Paha River near Keyapaha, SD is USGS streamgage 06464100 in South Dakota, monitoring river discharge in hydrologic subbasin 10150006. It sits on the Keya Paha River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 535 square miles. Discharge records at this site go back to 1981. Typical flow runs near 24.8 cfs in July and 63.7 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
- 535 sq mi
- Gauge elevation
- 2,218 ft
- Subbasin (HUC-8)
- 10150006
- Coordinates
- 43.12917, -100.10667
- USGS site number
- 06464100
- Records begin
- 1981-10-01 (45 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Keya Paha River near Keyapaha, 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 |
|---|---|---|---|---|
| 10.4 | 11.3 | 12.2 | ||
| 10 | 11 | 12.2 | ||
| 9.7 | 11 | 12.6 | ||
| 9.9 | 11.7 | 15.4 | ||
| 9.8 | 12.2 | 16.9 | ||
| 10 | 12.7 | 18.5 | ||
| 10.7 | 14.2 | 22.4 | ||
| 12.4 | 19.9 | 48.1 | ||
| 12.3 | 25.7 | 78.7 | ||
| 12.9 | 27.1 | 76.7 | ||
| 12.8 | 25.3 | 63 | ||
| 12.2 | 23 | 52.2 | ||
| 12.2 | 22.4 | 46.7 | ||
| 11.8 | 21 | 41.7 |
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 45 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 | 8.9 | 23.1 | 49.6 | |
| February | 16.6 | 37 | 110.8 | |
| March | 32.7 | 59.1 | 186.1 | |
| April | 29.1 | 63.7 | 177.6 | |
| May | 23.5 | 61.5 | 165.1 | |
| June | 18.2 | 47.6 | 148.4 | |
| July | 11.5 | 24.8 | 65.5 | |
| August | 9.7 | 17.6 | 41.2 | |
| September | 9.5 | 16.4 | 31.2 | |
| October | 11.8 | 21.9 | 46.8 | |
| November | 14.3 | 26.6 | 51.1 | |
| December | 11.9 | 23.2 | 48.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Keya Paha River near Keyapaha, SD normally run highest?
- April, on the long-term record. The median daily flow that month is about 63.7 cfs, against 16.4 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 Keya Paha River near Keyapaha, SD?
- It depends on the month. In January, half of days historically fall near 23.1 cfs, with the middle 80% of days between 8.9 and 49.6 cfs. The month-by-month table on this page gives the full range.
- How long has Keya Paha River near Keyapaha, SD been measured?
- Discharge records at USGS site 06464100 begin in 1981, about 45 years, covering roughly 9,079 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Keya Paha River near Keyapaha, 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 Keya Paha River near Keyapaha, SD?
- The gauge sits at 43.12917, -100.10667, in South Dakota, in hydrologic subbasin 10150006, at an elevation of about 2,218 feet, draining roughly 535 square miles.
- Can I use Keya Paha River near Keyapaha, 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 Keya Paha River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Keya Paha River in full.
- Keya Paha River near Keyapaha, SD this page
- Keya Paha River at Wewela, SD 1,129 sq mi