USGS Streamgage 10092700
Bear River at Idaho-Utah State Line
Bear River at Idaho-Utah State Line is USGS streamgage 10092700 in Idaho, monitoring river discharge in hydrologic subbasin 16010202. It drains a watershed of about 4,884 square miles. Discharge records at this site go back to 1970. Typical flow runs near 828 cfs in July and 988.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 4,884 sq mi
- Gauge elevation
- 4,424 ft
- Subbasin (HUC-8)
- 16010202
- Coordinates
- 42.01298, -111.92134
- USGS site number
- 10092700
- Records begin
- 1970-10-01 (56 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 | 328.9 | 534.7 | 1,624.2 | |
| February | 349 | 565.5 | 1,731.7 | |
| March | 406 | 787 | 2,060 | |
| April | 424.4 | 988.3 | 2,377.3 | |
| May | 300.3 | 1,012.4 | 2,568.1 | |
| June | 280.5 | 810 | 2,573.7 | |
| July | 433.9 | 828 | 1,411 | |
| August | 436.6 | 785.4 | 1,366.1 | |
| September | 251.3 | 543.7 | 1,644.7 | |
| October | 236.2 | 481.2 | 1,886.8 | |
| November | 282.2 | 483.5 | 1,881 | |
| December | 326.9 | 520 | 1,694.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Bear River at Idaho-Utah State Line normally run highest?
- May, on the long-term record. The median daily flow that month is about 1,012.4 cfs, against 481.2 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Bear River at Idaho-Utah State Line?
- It depends on the month. In January, half of days historically fall near 534.7 cfs, with the middle 80% of days between 328.9 and 1,624.2 cfs. The month-by-month table on this page gives the full range.
- How long has Bear River at Idaho-Utah State Line been measured?
- Discharge records at USGS site 10092700 begin in 1970, about 56 years, covering roughly 9,121 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Bear River at Idaho-Utah State Line?
- The gauge sits at 42.01298, -111.92134, in Idaho, in hydrologic subbasin 16010202, at an elevation of about 4,424 feet, draining roughly 4,884 square miles.
- Can I use Bear River at Idaho-Utah State Line 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.