USGS Streamgage 10173450
Mammoth Creek above West Hatch Ditch, near Hatch, UT
Mammoth Creek above West Hatch Ditch, near Hatch, UT is USGS streamgage 10173450 in Utah, monitoring river discharge in hydrologic subbasin 16030001. It drains a watershed of about 105 square miles. Discharge records at this site go back to 1964. Typical flow runs near 33.4 cfs in July and 27.5 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Utah
- Drainage area
- 105 sq mi
- Gauge elevation
- 7,286 ft
- Subbasin (HUC-8)
- 16030001
- Coordinates
- 37.62276, -112.51688
- USGS site number
- 10173450
- Records begin
- 1964-10-01 (62 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 62 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 | 4.2 | 11 | 20.5 | |
| February | 4.6 | 11 | 18.7 | |
| March | 6.4 | 12.3 | 21.3 | |
| April | 10.5 | 27.5 | 66.6 | |
| May | 34.9 | 150 | 392.5 | |
| June | 21.4 | 85.9 | 459.1 | |
| July | 12.8 | 33.4 | 120.8 | |
| August | 9.9 | 24.8 | 63.1 | |
| September | 8.6 | 20.5 | 48.6 | |
| October | 7.7 | 18.4 | 37 | |
| November | 7.3 | 15.9 | 28 | |
| December | 5.7 | 12.1 | 23.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Mammoth Creek above West Hatch Ditch, near Hatch, UT normally run highest?
- May, on the long-term record. The median daily flow that month is about 150 cfs, against 11 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 Mammoth Creek above West Hatch Ditch, near Hatch, UT?
- It depends on the month. In January, half of days historically fall near 11 cfs, with the middle 80% of days between 4.2 and 20.5 cfs. The month-by-month table on this page gives the full range.
- How long has Mammoth Creek above West Hatch Ditch, near Hatch, UT been measured?
- Discharge records at USGS site 10173450 begin in 1964, about 62 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Mammoth Creek above West Hatch Ditch, near Hatch, UT?
- The gauge sits at 37.62276, -112.51688, in Utah, in hydrologic subbasin 16030001, at an elevation of about 7,286 feet, draining roughly 105 square miles.
- Can I use Mammoth Creek above West Hatch Ditch, near Hatch, 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.