USGS Streamgage 10172800
South Willow Creek near Grantsville, UT
South Willow Creek near Grantsville, UT is USGS streamgage 10172800 in Utah, monitoring river discharge in hydrologic subbasin 16020304. It drains a watershed of about 4 square miles. Discharge records at this site go back to 1961. Typical flow runs near 7.4 cfs in July and 5.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Utah
- Drainage area
- 4 sq mi
- Gauge elevation
- 6,335 ft
- Subbasin (HUC-8)
- 16020304
- Coordinates
- 40.49631, -112.57442
- USGS site number
- 10172800
- Records begin
- 1961-09-28 (65 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 63 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 | 1.7 | 2.6 | 4 | |
| February | 1.7 | 2.6 | 4 | |
| March | 2 | 3.2 | 5.5 | |
| April | 3.2 | 5.7 | 11.6 | |
| May | 6.6 | 13.5 | 28.3 | |
| June | 6.7 | 15.3 | 34.4 | |
| July | 3 | 7.4 | 18.6 | |
| August | 2.2 | 4.1 | 8.9 | |
| September | 1.9 | 3.5 | 6.1 | |
| October | 2 | 3.1 | 5.3 | |
| November | 1.8 | 3 | 4.7 | |
| December | 1.7 | 2.7 | 4.2 |
All values in cubic feet per second (cfs).
Common questions
- When does South Willow Creek near Grantsville, UT normally run highest?
- June, on the long-term record. The median daily flow that month is about 15.3 cfs, against 2.6 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 South Willow Creek near Grantsville, UT?
- It depends on the month. In January, half of days historically fall near 2.6 cfs, with the middle 80% of days between 1.7 and 4 cfs. The month-by-month table on this page gives the full range.
- How long has South Willow Creek near Grantsville, UT been measured?
- Discharge records at USGS site 10172800 begin in 1961, about 65 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is South Willow Creek near Grantsville, UT?
- The gauge sits at 40.49631, -112.57442, in Utah, in hydrologic subbasin 16020304, at an elevation of about 6,335 feet, draining roughly 4 square miles.
- Can I use South Willow Creek near Grantsville, UT 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.