USGS Streamgage 12450700
Columbia River below Wells Dam, WA
Columbia River below Wells Dam, WA is USGS streamgage 12450700 in Washington, monitoring river discharge in hydrologic subbasin 17020005. It drains a watershed of about 86,100 square miles. Discharge records at this site go back to 1967. Typical flow runs near 122,741.9 cfs in July and 110,363.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 86,100 sq mi
- Gauge elevation
- 721 ft
- Subbasin (HUC-8)
- 17020005
- Coordinates
- 47.94653, -119.86673
- USGS site number
- 12450700
- Records begin
- 1967-10-01 (59 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 59 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 | 70,512.9 | 107,774.2 | 148,516.1 | |
| February | 65,700 | 103,989.7 | 152,137.9 | |
| March | 59,148.4 | 99,016.1 | 156,871 | |
| April | 60,823.3 | 110,363.3 | 174,800 | |
| May | 91,451.6 | 142,774.2 | 224,161.3 | |
| June | 90,703.3 | 152,466.7 | 252,833.3 | |
| July | 76,467.7 | 122,741.9 | 200,871 | |
| August | 70,390.3 | 102,593.5 | 147,322.6 | |
| September | 49,400 | 71,753.3 | 100,053.3 | |
| October | 50,254.8 | 72,600 | 97,496.8 | |
| November | 62,530 | 88,293.3 | 110,266.7 | |
| December | 70,941.9 | 98,248.4 | 135,935.5 |
All values in cubic feet per second (cfs).