USGS Streamgage 10113500
BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT
BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT is USGS streamgage 10113500 in Utah, monitoring river discharge in hydrologic subbasin 16010203. It drains a watershed of about 263 square miles. Discharge records at this site go back to 1913. Typical flow runs near 109.4 cfs in July and 164.1 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Utah
- Drainage area
- 263 sq mi
- Gauge elevation
- 5,021 ft
- Subbasin (HUC-8)
- 16010203
- Coordinates
- 41.62401, -111.73616
- USGS site number
- 10113500
- Records begin
- 1913-11-28 (113 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 112 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 | 49.5 | 71.2 | 107.5 | |
| February | 52.3 | 72.7 | 108 | |
| March | 59.9 | 89.6 | 152.1 | |
| April | 77.6 | 164.1 | 398.5 | |
| May | 86 | 229.8 | 569.8 | |
| June | 67 | 145.3 | 289.8 | |
| July | 55.7 | 109.4 | 191.9 | |
| August | 51.8 | 95.7 | 165.5 | |
| September | 49.4 | 88.6 | 147.6 | |
| October | 51.7 | 84.1 | 135.4 | |
| November | 51.1 | 79.6 | 123.2 | |
| December | 49.8 | 75.2 | 113.6 |
All values in cubic feet per second (cfs).
Common questions
- When does BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT normally run highest?
- May, on the long-term record. The median daily flow that month is about 229.8 cfs, against 71.2 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 BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT?
- It depends on the month. In January, half of days historically fall near 71.2 cfs, with the middle 80% of days between 49.5 and 107.5 cfs. The month-by-month table on this page gives the full range.
- How long has BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT been measured?
- Discharge records at USGS site 10113500 begin in 1913, about 113 years, covering roughly 9,123 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT?
- The gauge sits at 41.62401, -111.73616, in Utah, in hydrologic subbasin 16010203, at an elevation of about 5,021 feet, draining roughly 263 square miles.
- Can I use BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, 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.