USGS Streamgage 12462600
Columbia River below Rock Island Dam, WA
Columbia River below Rock Island Dam, WA is USGS streamgage 12462600 in Washington, monitoring river discharge in hydrologic subbasin 17020010. It drains a watershed of about 89,400 square miles. Discharge records at this site go back to 1961. Typical flow runs near 133,612.9 cfs in July and 110,350 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 89,400 sq mi
- Gauge elevation
- 598 ft
- Subbasin (HUC-8)
- 17020010
- Coordinates
- 47.33235, -120.08117
- USGS site number
- 12462600
- Records begin
- 1961-06-01 (65 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 65 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 | 70,367.7 | 106,419.4 | 149,935.5 | |
| February | 68,803.4 | 103,262.1 | 151,241.4 | |
| March | 60,700 | 97,474.2 | 154,838.7 | |
| April | 64,446.7 | 110,350 | 176,366.7 | |
| May | 98,658.1 | 154,483.9 | 238,677.4 | |
| June | 98,923.3 | 169,866.7 | 310,566.7 | |
| July | 81,661.3 | 133,612.9 | 227,580.6 | |
| August | 72,254.8 | 104,641.9 | 149,516.1 | |
| September | 50,930 | 74,093.3 | 100,693.3 | |
| October | 53,245.2 | 74,067.7 | 98,654.8 | |
| November | 63,666.7 | 89,986.7 | 112,933.3 | |
| December | 69,774.2 | 99,348.4 | 138,161.3 |
All values in cubic feet per second (cfs).