USGS Streamgage 12148000
South Fork Tolt River near Carnation, WA
South Fork Tolt River near Carnation, WA is USGS streamgage 12148000 in Washington, monitoring river discharge in hydrologic subbasin 17110010. It drains a watershed of about 20 square miles. Discharge records at this site go back to 1952. Typical flow runs near 62.7 cfs in July and 71.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 20 sq mi
- Gauge elevation
- 1,277 ft
- Subbasin (HUC-8)
- 17110010
- Coordinates
- 47.68927, -121.71345
- USGS site number
- 12148000
- Records begin
- 1952-10-01 (74 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 57 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 | 51.5 | 72.1 | 490.6 | |
| February | 53.6 | 68.1 | 353.3 | |
| March | 55.8 | 69.7 | 162.1 | |
| April | 57.4 | 71.9 | 166 | |
| May | 57.2 | 75.8 | 190.5 | |
| June | 41.5 | 68.5 | 166 | |
| July | 35.6 | 62.7 | 80.8 | |
| August | 34.3 | 60 | 69.4 | |
| September | 44.3 | 61 | 75.8 | |
| October | 53.1 | 62.9 | 86.4 | |
| November | 50.6 | 67.1 | 243.4 | |
| December | 51.5 | 69.6 | 356.1 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- SF Tolt River below Regulating Basin near Carnation, WA
- Tolt River near Carnation, WA
- Snoqualmie River near Carnation, WA
- Snoqualmie River at Duvall, WA
- Middle Fork Snoqualmie River near Tanner, WA
- NF Snoqualmie River near Snoqualmie Falls, WA
- North Fork Snoqualmie River near North Bend, WA
- SF Snoqualmie River Ab Alice Creek near Garcia, WA