USGS Streamgage 06630000
N Platte River Ab Seminoe Reservoir, near Sinclair, WY
N Platte River Ab Seminoe Reservoir, near Sinclair, WY is USGS streamgage 06630000 in Wyoming, monitoring river discharge in hydrologic subbasin 10180002. It drains a watershed of about 4,184 square miles. Discharge records at this site go back to 1939. Typical flow runs near 964.1 cfs in July and 1,224.4 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
- Wyoming
- Drainage area
- 4,184 sq mi
- Gauge elevation
- 6,409 ft
- Subbasin (HUC-8)
- 10180002
- Coordinates
- 41.87217, -107.0576
- USGS site number
- 06630000
- Records begin
- 1939-07-01 (87 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for N Platte River Ab Seminoe Reservoir, near Sinclair, WY. 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 |
|---|---|---|---|---|
| 52.8 | 57.5 | 63.2 | ||
| 50.1 | 56.9 | 67.3 | ||
| 47.5 | 56.9 | 75.4 | ||
| 47.9 | 60.2 | 87.2 | ||
| 49.2 | 64.5 | 101 | ||
| 50.8 | 69.8 | 117 | ||
| 55.8 | 82.4 | 156 | ||
| 62.8 | 104 | 208 | ||
| 62.3 | 106 | 209 | ||
| 59.3 | 99.6 | 190 | ||
| 55.6 | 93.5 | 177 | ||
| 54.3 | 91.9 | 174 | ||
| 52.7 | 89.4 | 169 | ||
| 49.3 | 83.4 | 159 |
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 87 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 | 216.5 | 328.1 | 452.2 | |
| February | 239.7 | 351.8 | 490.8 | |
| March | 322.7 | 503.9 | 950.7 | |
| April | 634.2 | 1,224.4 | 2,451.3 | |
| May | 1,245.3 | 2,817.4 | 5,706.1 | |
| June | 1,237.5 | 3,841.7 | 7,928.7 | |
| July | 318.9 | 964.1 | 2,834.2 | |
| August | 174.5 | 396.3 | 876.1 | |
| September | 119.1 | 250.1 | 536.8 | |
| October | 208.7 | 366.8 | 697.5 | |
| November | 255.4 | 399.8 | 655.8 | |
| December | 232.8 | 344.7 | 489.2 |
All values in cubic feet per second (cfs).
Common questions
- When does N Platte River Ab Seminoe Reservoir, near Sinclair, WY normally run highest?
- June, on the long-term record. The median daily flow that month is about 3,841.7 cfs, against 250.1 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 N Platte River Ab Seminoe Reservoir, near Sinclair, WY?
- It depends on the month. In January, half of days historically fall near 328.1 cfs, with the middle 80% of days between 216.5 and 452.2 cfs. The month-by-month table on this page gives the full range.
- How long has N Platte River Ab Seminoe Reservoir, near Sinclair, WY been measured?
- Discharge records at USGS site 06630000 begin in 1939, about 87 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for N Platte River Ab Seminoe Reservoir, near Sinclair, WY?
- 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 N Platte River Ab Seminoe Reservoir, near Sinclair, WY?
- The gauge sits at 41.87217, -107.0576, in Wyoming, in hydrologic subbasin 10180002, at an elevation of about 6,409 feet, draining roughly 4,184 square miles.
- Can I use N Platte River Ab Seminoe Reservoir, near Sinclair, WY 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.