USGS Streamgage 06471500
Elm River at Westport, SD
Elm River at Westport, SD is USGS streamgage 06471500, monitoring river discharge in hydrologic subbasin 10160004. It drains a watershed of about 1,505 square miles. Discharge records at this site go back to 1945. Typical flow runs near 11.1 cfs in July and 48.1 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 1,505 sq mi
- Gauge elevation
- 1,314 ft
- Subbasin (HUC-8)
- 10160004
- Coordinates
- 45.65609, -98.49704
- USGS site number
- 06471500
- Records begin
- 1945-10-01 (81 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 81 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 | 0.8 | 3.2 | 7.7 | |
| February | 0.7 | 3.5 | 13.8 | |
| March | 1.6 | 18 | 544 | |
| April | 2.8 | 48.1 | 937.8 | |
| May | 2.8 | 31.5 | 351.3 | |
| June | 2 | 16.1 | 227.2 | |
| July | 3 | 11.1 | 176.5 | |
| August | 2 | 7.7 | 75.2 | |
| September | 1.1 | 5.6 | 29.6 | |
| October | 0.9 | 6 | 22.8 | |
| November | 1.5 | 5.4 | 15.4 | |
| December | 1.4 | 4.1 | 10.4 |
All values in cubic feet per second (cfs).