USGS Streamgage 10109000
Logan River above State Dam, near Logan, UT
Logan River above State Dam, near Logan, UT is USGS streamgage 10109000 in Utah, monitoring river discharge in hydrologic subbasin 16010203. It drains a watershed of about 214 square miles. Discharge records at this site go back to 1896. Typical flow runs near 207.8 cfs in July and 217.6 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Utah
- Drainage area
- 214 sq mi
- Gauge elevation
- 4,682 ft
- Subbasin (HUC-8)
- 16010203
- Coordinates
- 41.74355, -111.78398
- USGS site number
- 10109000
- Records begin
- 1896-06-06 (130 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 56 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 | 74.3 | 101.4 | 148.7 | |
| February | 73.5 | 98 | 142.4 | |
| March | 86.7 | 117.4 | 184.7 | |
| April | 122.3 | 217.6 | 427.1 | |
| May | 226.5 | 490.4 | 976.7 | |
| June | 192.8 | 497.9 | 1,173.6 | |
| July | 104.6 | 207.8 | 615.9 | |
| August | 79 | 143 | 279 | |
| September | 71.3 | 120.7 | 229.7 | |
| October | 78.4 | 119.7 | 209.2 | |
| November | 82.2 | 119 | 183.5 | |
| December | 75.6 | 107.9 | 157.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Logan River above State Dam, near Logan, UT normally run highest?
- June, on the long-term record. The median daily flow that month is about 497.9 cfs, against 98 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Logan River above State Dam, near Logan, UT?
- It depends on the month. In January, half of days historically fall near 101.4 cfs, with the middle 80% of days between 74.3 and 148.7 cfs. The month-by-month table on this page gives the full range.
- How long has Logan River above State Dam, near Logan, UT been measured?
- Discharge records at USGS site 10109000 begin in 1896, about 130 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 Logan River above State Dam, near Logan, UT?
- The gauge sits at 41.74355, -111.78398, in Utah, in hydrologic subbasin 16010203, at an elevation of about 4,682 feet, draining roughly 214 square miles.
- Can I use Logan River above State Dam, near Logan, 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.