USGS Streamgage 06730500
Boulder Creek at Mouth near Longmont, CO
Boulder Creek at Mouth near Longmont, CO is USGS streamgage 06730500 in Colorado, monitoring river discharge in hydrologic subbasin 10190005. It drains a watershed of about 447 square miles. Discharge records at this site go back to 1927. Typical flow runs near 11.1 cfs in July and 58.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Colorado
- Drainage area
- 447 sq mi
- Gauge elevation
- 4,884 ft
- Subbasin (HUC-8)
- 10190005
- Coordinates
- 40.13878, -105.02022
- USGS site number
- 06730500
- Records begin
- 1927-04-01 (99 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 99 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 | 15.9 | 52.1 | 80.8 | |
| February | 15.2 | 50.6 | 82.9 | |
| March | 13.9 | 48 | 104.5 | |
| April | 5.5 | 58.4 | 209.1 | |
| May | 3.5 | 98.9 | 474 | |
| June | 4 | 108.1 | 617.3 | |
| July | 1.9 | 11.1 | 157 | |
| August | 1.3 | 5.6 | 47.2 | |
| September | 1.4 | 7.4 | 49.5 | |
| October | 1.6 | 26.2 | 84.2 | |
| November | 3.2 | 46.1 | 88.4 | |
| December | 7.3 | 53.4 | 83.6 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- St Vrain Creek below Boulder Creek at Hwy 119 near Longmont
- Left Hand Creek at Hover Road near Longmont, CO
- Fourmile Creek at Logan Mill Road near Crisman, CO
- Fourmile Creek at Orodell, CO
- South Boulder Creek at Forebay near Eldorado Springs, CO
- Fourmile Canyon Creek near Sunshine, CO
- Boulder Creek at North 75Th St. near Boulder, CO