USGS Streamgage 12470500
Rocky Ford Creek near Ephrata, WA
Rocky Ford Creek near Ephrata, WA is USGS streamgage 12470500 in Washington, monitoring river discharge in hydrologic subbasin 17020015. It drains a watershed of about 458 square miles. Discharge records at this site go back to 1942. Typical flow runs near 79.9 cfs in July and 57.8 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 458 sq mi
- Gauge elevation
- 1,073 ft
- Subbasin (HUC-8)
- 17020015
- Coordinates
- 47.31264, -119.44559
- USGS site number
- 12470500
- Records begin
- 1942-08-01 (84 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 50 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 | 44.8 | 60.6 | 77.8 | |
| February | 40.2 | 55.9 | 80.1 | |
| March | 38 | 54.9 | 89.4 | |
| April | 39.1 | 57.8 | 118.4 | |
| May | 45.1 | 65 | 127.8 | |
| June | 51.5 | 73.8 | 119.5 | |
| July | 51.5 | 79.9 | 112 | |
| August | 56.8 | 84.8 | 107.8 | |
| September | 57.6 | 87.3 | 104.2 | |
| October | 54.4 | 83.4 | 99.8 | |
| November | 53.7 | 77.7 | 94.2 | |
| December | 49.6 | 69.8 | 85.6 |
All values in cubic feet per second (cfs).