USGS Streamgage 09371010
San Juan River at Four Corners, CO
San Juan River at Four Corners, CO is USGS streamgage 09371010 in Colorado, monitoring river discharge in hydrologic subbasin 14080201. It drains a watershed of about 14,600 square miles. Discharge records at this site go back to 1977. Typical flow runs near 1,245.5 cfs in July and 1,490.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Colorado
- Drainage area
- 14,600 sq mi
- Gauge elevation
- 4,614 ft
- Subbasin (HUC-8)
- 14080201
- Coordinates
- 37.00114, -109.02958
- USGS site number
- 09371010
- Records begin
- 1977-10-01 (49 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 46 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 | 527.8 | 870.8 | 2,233.5 | |
| February | 538.3 | 918 | 2,683.8 | |
| March | 575 | 1,072.1 | 3,476.5 | |
| April | 548.6 | 1,490.7 | 5,185.7 | |
| May | 918.5 | 2,985.5 | 7,476.1 | |
| June | 756.8 | 3,927 | 8,641.7 | |
| July | 448.5 | 1,245.5 | 4,280 | |
| August | 390.7 | 862.4 | 2,604.8 | |
| September | 455.6 | 865.5 | 2,671.3 | |
| October | 601.3 | 907.2 | 1,842.3 | |
| November | 598.4 | 907.9 | 1,712.3 | |
| December | 557.4 | 894 | 1,961.9 |
All values in cubic feet per second (cfs).