USGS Streamgage 12087000
Mashel River near La Grande, WA
Mashel River near La Grande, WA is USGS streamgage 12087000 in Washington, monitoring river discharge in hydrologic subbasin 17110015. It drains a watershed of about 81 square miles. Discharge records at this site go back to 1940. Typical flow runs near 34.3 cfs in July and 252 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 81 sq mi
- Gauge elevation
- 653 ft
- Subbasin (HUC-8)
- 17110015
- Coordinates
- 46.85674, -122.30259
- USGS site number
- 12087000
- Records begin
- 1940-10-01 (86 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 86 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 | 104.5 | 275.9 | 921.1 | |
| February | 105 | 243.1 | 805.5 | |
| March | 106.3 | 259.9 | 642.1 | |
| April | 127.3 | 252 | 510.2 | |
| May | 71.2 | 171.5 | 413.3 | |
| June | 32.1 | 104.7 | 320.1 | |
| July | 13.7 | 34.3 | 93 | |
| August | 7.7 | 15 | 41 | |
| September | 7.2 | 15.4 | 74.3 | |
| October | 12.2 | 51.4 | 255.2 | |
| November | 49.2 | 218 | 716.2 | |
| December | 99.6 | 295.5 | 961.4 |
All values in cubic feet per second (cfs).