USGS Streamgage 12021800
Chehalis River near Adna, WA
Chehalis River near Adna, WA is USGS streamgage 12021800 in Washington, monitoring river discharge in hydrologic subbasin 17100103. It drains a watershed of about 340 square miles. Discharge records at this site go back to 1999. Typical flow runs near 102.4 cfs in July and 1,044.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 340 sq mi
- Gauge elevation
- 194 ft
- Subbasin (HUC-8)
- 17100103
- Coordinates
- 46.62566, -123.1018
- USGS site number
- 12021800
- Records begin
- 1999-10-15 (27 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 11 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 | 881.1 | 2,421.3 | 9,673.2 | |
| February | 731.7 | 1,634.5 | 6,605.7 | |
| March | 762.6 | 1,491.6 | 4,924.2 | |
| April | 499.8 | 1,044.4 | 3,507.3 | |
| May | 225.5 | 413.1 | 1,276.1 | |
| June | 117.2 | 229.6 | 795.6 | |
| July | 58 | 102.4 | 199.5 | |
| August | 35.1 | 53.4 | 91.6 | |
| September | 35.2 | 59.9 | 278.4 | |
| October | 75.8 | 211.4 | 2,358.5 | |
| November | 229.9 | 1,550.7 | 6,909 | |
| December | 704.9 | 2,194.5 | 8,569 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- 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
- Chehalis River near Grand Mound, WA