USGS Streamgage 12214500
Sumas River near Sumas, WA
Sumas River near Sumas, WA is USGS streamgage 12214500 in Washington, monitoring river discharge in hydrologic subbasin 17110001. It drains a watershed of about 31 square miles. Discharge records at this site go back to 1948. Typical flow runs near 22 cfs in July and 105.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 31 sq mi
- Gauge elevation
- 40 ft
- Subbasin (HUC-8)
- 17110001
- Coordinates
- 48.97484, -122.25126
- USGS site number
- 12214500
- Records begin
- 1948-07-01 (78 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 78 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 | — | 80.1 | — | |
| February | — | 89 | — | |
| March | — | 93.6 | — | |
| April | — | 105.4 | — | |
| May | — | 60.7 | — | |
| June | — | 36.4 | — | |
| July | — | 22 | — | |
| August | — | 18.2 | — | |
| September | — | 16.8 | — | |
| October | — | 22.5 | — | |
| November | — | 61.1 | — | |
| December | — | 84.2 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Sumas River near Sumas, WA normally run highest?
- April, on the long-term record. The median daily flow that month is about 105.4 cfs, against 16.8 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has Sumas River near Sumas, WA been measured?
- Discharge records at USGS site 12214500 begin in 1948, about 78 years, covering roughly 1,692 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Sumas River near Sumas, WA?
- The gauge sits at 48.97484, -122.25126, in Washington, in hydrologic subbasin 17110001, at an elevation of about 40 feet, draining roughly 31 square miles.
- Can I use Sumas River near Sumas, WA data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.