USGS Streamgage 10016900
Bear River at Evanston, WY
Bear River at Evanston, WY is USGS streamgage 10016900 in Wyoming, monitoring river discharge in hydrologic subbasin 16010101. It drains a watershed of about 441 square miles. Discharge records at this site go back to 1984. Typical flow runs near 91.5 cfs in July and 252.2 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Wyoming
- Drainage area
- 441 sq mi
- Gauge elevation
- 6,730 ft
- Subbasin (HUC-8)
- 16010101
- Coordinates
- 41.26986, -110.96369
- USGS site number
- 10016900
- Records begin
- 1984-05-14 (42 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 42 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 | 20 | 37.2 | 65.6 | |
| February | 23.3 | 42.1 | 70.2 | |
| March | 41.2 | 87.8 | 270.6 | |
| April | 117.2 | 252.2 | 519.1 | |
| May | 302.8 | 688.4 | 1,402.4 | |
| June | 151.6 | 573.7 | 1,576 | |
| July | 38.1 | 91.5 | 412.7 | |
| August | 19.1 | 55.5 | 131.4 | |
| September | 15.1 | 45.6 | 113.4 | |
| October | 18.6 | 46.3 | 124.7 | |
| November | 16.5 | 42.1 | 95.7 | |
| December | 17.2 | 36.1 | 70.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Bear River at Evanston, WY normally run highest?
- May, on the long-term record. The median daily flow that month is about 688.4 cfs, against 36.1 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 at Evanston, WY?
- It depends on the month. In January, half of days historically fall near 37.2 cfs, with the middle 80% of days between 20 and 65.6 cfs. The month-by-month table on this page gives the full range.
- How long has Bear River at Evanston, WY been measured?
- Discharge records at USGS site 10016900 begin in 1984, about 42 years, covering roughly 8,971 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Bear River at Evanston, WY?
- The gauge sits at 41.26986, -110.96369, in Wyoming, in hydrologic subbasin 16010101, at an elevation of about 6,730 feet, draining roughly 441 square miles.
- Can I use Bear River at Evanston, WY 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.