USGS Streamgage 12436500
Columbia River at Grand Coulee, WA
Columbia River at Grand Coulee, WA is USGS streamgage 12436500 in Washington, monitoring river discharge in hydrologic subbasin 17020005. It drains a watershed of about 74,700 square miles. Discharge records at this site go back to 1894. Typical flow runs near 154,290.3 cfs in July and 93,270 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 74,700 sq mi
- Gauge elevation
- 961 ft
- Subbasin (HUC-8)
- 17020005
- Coordinates
- 47.96543, -118.9828
- USGS site number
- 12436500
- Records begin
- 1894-06-01 (132 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 103 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 | 36,854.8 | 82,432.3 | 135,451.6 | |
| February | 35,769 | 79,520.7 | 137,069 | |
| March | 39,461.3 | 77,464.5 | 135,064.5 | |
| April | 52,033.3 | 93,270 | 156,133.3 | |
| May | 82,729 | 147,129 | 258,225.8 | |
| June | 90,036.7 | 194,333.3 | 348,866.7 | |
| July | 83,193.5 | 154,290.3 | 259,709.7 | |
| August | 76,829 | 105,932.3 | 145,419.4 | |
| September | 52,326.7 | 71,083.3 | 95,236.7 | |
| October | 44,864.5 | 64,093.5 | 90,145.2 | |
| November | 40,063.3 | 72,843.3 | 103,133.3 | |
| December | 36,874.2 | 79,125.8 | 121,893.5 |
All values in cubic feet per second (cfs).