USGS Streamgage 12020800
South Fork Chehalis River near Wildwood, WA
South Fork Chehalis River near Wildwood, WA is USGS streamgage 12020800 in Washington, monitoring river discharge in hydrologic subbasin 17100103. It drains a watershed of about 27 square miles. Discharge records at this site go back to 1996.
Gauge details
- State
- Washington
- Drainage area
- 27 sq mi
- Gauge elevation
- 366 ft
- Subbasin (HUC-8)
- 17100103
- Coordinates
- 46.44483, -123.08374
- USGS site number
- 12020800
- Records begin
- 1996-02-08 (30 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 27 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 8 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 83.2 | 193.8 | 866.6 | |
| February | 74.4 | 132.9 | 486.1 | |
| March | 71 | 140.2 | 410 | |
| April | 51.9 | 105.5 | 245.2 | |
| May | — | 37 | — | |
| October | 6.5 | 20.4 | 118.3 | |
| November | 28 | 125.2 | 624.8 | |
| December | 56.5 | 185.9 | 725 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Chehalis River near Adna, WA
- South Fork Newaukum River near Onalaska, WA
- NF Newaukum River above Bear Creek near Forest, WA
- Newaukum River near Chehalis, WA
- Chehalis River at Wwtp at Chehalis, WA
- Skookumchuck River near Vail, WA
- Skookumchuck River below Bldy Run Creek near Centralia, WA
- Skookumchuck River near Bucoda, WA