USGS Streamgage 14220500
Lewis River at Ariel, WA
Lewis River at Ariel, WA is USGS streamgage 14220500 in Washington, monitoring river discharge in hydrologic subbasin 17080002. It drains a watershed of about 731 square miles. Discharge records at this site go back to 1909. Typical flow runs near 1,776.1 cfs in July and 5,024.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 731 sq mi
- Subbasin (HUC-8)
- 17080002
- Coordinates
- 45.95174, -122.56397
- USGS site number
- 14220500
- Records begin
- 1909-07-01 (117 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 117 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 | 2,898.7 | 7,392.3 | 12,029 | |
| February | 2,688.3 | 6,524.1 | 11,900 | |
| March | 2,561.3 | 5,681.6 | 10,461.6 | |
| April | 2,425.3 | 5,024.7 | 8,687.7 | |
| May | 2,210.3 | 4,540.6 | 7,996.5 | |
| June | 1,601.3 | 3,057.3 | 6,582 | |
| July | 884.2 | 1,776.1 | 3,392.9 | |
| August | 782.8 | 1,228.7 | 2,020 | |
| September | 817.3 | 1,400.3 | 3,422.7 | |
| October | 1,046.7 | 2,409 | 5,660.6 | |
| November | 2,176.7 | 5,318.7 | 11,113.3 | |
| December | 2,640.3 | 7,095.8 | 12,371 |
All values in cubic feet per second (cfs).