USGS Streamgage 06434505
Inlet Canal above Belle Fourche Reservoir, SD
Inlet Canal above Belle Fourche Reservoir, SD is USGS streamgage 06434505 in South Dakota, monitoring river discharge in hydrologic subbasin 10120202. Discharge records at this site go back to 1994. Typical flow runs near 107.3 cfs in July and 191.7 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.
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Gauge details
- State
- South Dakota
- Gauge elevation
- 2,972 ft
- Subbasin (HUC-8)
- 10120202
- Coordinates
- 44.70094, -103.73231
- USGS site number
- 06434505
- Records begin
- 1994-10-01 (32 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Inlet Canal above Belle Fourche Reservoir, 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 |
|---|---|---|---|---|
| 18 | 32.7 | 43.2 | ||
| 4.9 | 32 | 53.8 | ||
| 2.6 | 30 | 57.7 | ||
| 2.4 | 29.4 | 62.5 | ||
| 2 | 28.3 | 62.8 | ||
| 1.9 | 29.3 | 69.3 | ||
| 2 | 32.8 | 76.2 | ||
| 2.9 | 40.2 | 85.1 | ||
| 3.1 | 43.8 | 91.4 | ||
| 4 | 51.6 | 104 | ||
| 4.3 | 53.3 | 109 | ||
| 5.5 | 56.5 | 112 | ||
| 5.7 | 57.2 | 113 | ||
| 4.3 | 55.6 | 114 |
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 32 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 | 0.8 | 152.1 | 233.8 | |
| February | 0.7 | 137 | 218.9 | |
| March | 0.9 | 179.1 | 363 | |
| April | 0.8 | 191.7 | 363.9 | |
| May | 2.3 | 183.2 | 428.5 | |
| June | 11.4 | 149.2 | 422.9 | |
| July | 21.4 | 107.3 | 252.7 | |
| August | 44.2 | 108.6 | 228.6 | |
| September | 9.9 | 133.4 | 222 | |
| October | 6.9 | 170.9 | 312.8 | |
| November | 1.2 | 176.9 | 267.6 | |
| December | 0.4 | 155.8 | 227.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Inlet Canal above Belle Fourche Reservoir, SD normally run highest?
- April, on the long-term record. The median daily flow that month is about 191.7 cfs, against 107.3 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Inlet Canal above Belle Fourche Reservoir, SD?
- It depends on the month. In January, half of days historically fall near 152.1 cfs, with the middle 80% of days between 0.8 and 233.8 cfs. The month-by-month table on this page gives the full range.
- How long has Inlet Canal above Belle Fourche Reservoir, SD been measured?
- Discharge records at USGS site 06434505 begin in 1994, about 32 years, covering roughly 9,124 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Inlet Canal above Belle Fourche Reservoir, 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 Inlet Canal above Belle Fourche Reservoir, SD?
- The gauge sits at 44.70094, -103.73231, in South Dakota, in hydrologic subbasin 10120202, at an elevation of about 2,972 feet.
- Can I use Inlet Canal above Belle Fourche Reservoir, 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.