USGS Streamgage 14238000
Cowlitz River below Mayfield Dam, WA
Cowlitz River below Mayfield Dam, WA is USGS streamgage 14238000 in Washington, monitoring river discharge in hydrologic subbasin 17080005. It drains a watershed of about 1,400 square miles. Discharge records at this site go back to 1911. Typical flow runs near 3,693.2 cfs in July and 5,790 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 1,400 sq mi
- Subbasin (HUC-8)
- 17080005
- Coordinates
- 46.51039, -122.61622
- USGS site number
- 14238000
- Records begin
- 1911-11-19 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 92 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 | 3,883.5 | 8,158.1 | 15,067.7 | |
| February | 3,884.8 | 6,931.4 | 13,679.3 | |
| March | 3,533.2 | 5,802.9 | 10,334.2 | |
| April | 3,402.7 | 5,790 | 10,706.7 | |
| May | 3,179.7 | 6,250 | 12,248.4 | |
| June | 3,142.7 | 6,035 | 11,845.3 | |
| July | 2,251.9 | 3,693.2 | 7,241 | |
| August | 1,697.4 | 2,603.5 | 4,059.7 | |
| September | 1,337.7 | 2,561 | 4,231 | |
| October | 1,411 | 3,562.9 | 6,046.5 | |
| November | 2,546.3 | 6,342 | 13,076.7 | |
| December | 3,841 | 8,666.8 | 16,429 |
All values in cubic feet per second (cfs).