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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
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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)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT. 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 |
|---|---|---|---|---|
| 47.3 | 47.8 | 48.3 | ||
| 47.1 | 47.8 | 48.3 | ||
| 47 | 47.8 | 48.6 | ||
| 46.6 | 47.8 | 48.7 | ||
| 46.1 | 47.7 | 49 | ||
| 45.8 | 47.7 | 49.3 | ||
| 45.4 | 47.6 | 49.6 | ||
| 45 | 47.6 | 49.8 | ||
| 44.5 | 47.5 | 49.7 | ||
| 44.2 | 47.5 | 49.8 | ||
| 44 | 47.5 | 49.9 | ||
| 43.9 | 47.6 | 50.2 | ||
| 43.4 | 47.5 | 50.5 | ||
| 43.2 | 47.5 | 50.6 |
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 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 9,127 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for BLACKSMITH FORK AB UP and L CO.'S DAM near HYRUM, UT?
- 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 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.