USGS Streamgage 10080000
Bear River below Grace Dam, near Grace, ID
Bear River below Grace Dam, near Grace, ID is USGS streamgage 10080000 in Idaho, monitoring river discharge in hydrologic subbasin 16010202. It drains a watershed of about 4,110 square miles. Discharge records at this site go back to 1922. Typical flow runs near 28.8 cfs in July and 16 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 4,110 sq mi
- Subbasin (HUC-8)
- 16010202
- Coordinates
- 42.5863, -111.73164
- USGS site number
- 10080000
- Records begin
- 1922-04-01 (104 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 104 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 | 2.2 | 9.8 | 69.7 | |
| February | 2 | 10.5 | 70.7 | |
| March | 2.1 | 10.7 | 153.7 | |
| April | 2 | 16 | 489.9 | |
| May | 3.7 | 24.1 | 468.3 | |
| June | 10.1 | 30.1 | 253.5 | |
| July | 6.2 | 28.8 | 296.6 | |
| August | 4.8 | 24.5 | 157.5 | |
| September | 3.8 | 20.4 | 90 | |
| October | 2.7 | 14.1 | 98.8 | |
| November | 2.3 | 10.4 | 101 | |
| December | 2 | 8.8 | 72.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Bear River below Grace Dam, near Grace, ID normally run highest?
- June, on the long-term record. The median daily flow that month is about 30.1 cfs, against 8.8 cfs in December, 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 below Grace Dam, near Grace, ID?
- It depends on the month. In January, half of days historically fall near 9.8 cfs, with the middle 80% of days between 2.2 and 69.7 cfs. The month-by-month table on this page gives the full range.
- How long has Bear River below Grace Dam, near Grace, ID been measured?
- Discharge records at USGS site 10080000 begin in 1922, about 104 years, covering roughly 6,263 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Bear River below Grace Dam, near Grace, ID?
- The gauge sits at 42.5863, -111.73164, in Idaho, in hydrologic subbasin 16010202, draining roughly 4,110 square miles.
- Can I use Bear River below Grace Dam, near Grace, ID 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.