USGS Streamgage 12181000
Skagit River at Marblemount, WA
Skagit River at Marblemount, WA is USGS streamgage 12181000 in Washington, monitoring river discharge in hydrologic subbasin 17110005. It drains a watershed of about 1,381 square miles. Discharge records at this site go back to 1943. Typical flow runs near 6,538.4 cfs in July and 5,384 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 1,381 sq mi
- Gauge elevation
- 313 ft
- Subbasin (HUC-8)
- 17110005
- Coordinates
- 48.53373, -121.42985
- USGS site number
- 12181000
- Records begin
- 1943-09-01 (83 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 83 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 | 3,859 | 6,818.7 | 9,345.5 | |
| February | 3,370 | 6,835.2 | 9,506.6 | |
| March | 3,471 | 5,925.8 | 8,361.3 | |
| April | 3,675.3 | 5,384 | 7,666.7 | |
| May | 3,978.7 | 6,014.5 | 9,551.3 | |
| June | 4,036.7 | 6,911.3 | 11,644.3 | |
| July | 3,506.8 | 6,538.4 | 12,292.9 | |
| August | 2,708.4 | 4,078.1 | 6,745.2 | |
| September | 2,700.3 | 3,834.3 | 5,375 | |
| October | 2,431.3 | 4,182.9 | 7,416.8 | |
| November | 3,504.3 | 5,653 | 12,432.3 | |
| December | 3,728.1 | 5,486.1 | 9,710.6 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Cascade River at Marblemount, WA
- Skagit River at Corkindale, WA
- Skagit River at Rockport, WA
- Skagit River above Miller Creek near Rockport, WA
- Baker River Ab Blum Creek near Concrete, WA
- Baker River at Henry Thompson Br at Concrete, WA
- Big Beaver Creek near Newhalem, WA
- Ruby Creek below Panther Creek near Newhalem, WA