Rocky Mountain Paddleboard - Union Reservoir
Saint Vrain Creek near Rocky Mountain Paddleboard - Union Reservoir
About this river
Saint Vrain Creek is a 4.8 mile river near Rocky Mountain Paddleboard - Union Reservoir in Colorado. Streamflow is measured at the USGS gauge ST Vrain CR below Boulder CR at Hwy 119 near Longmont (site 06730525). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2013 to 2026
Saint Vrain Creek typically runs highest in June, at a median 640 cfs, and lowest in September, at 89 cfs. The highest flow on record for any single day is 4,570 cfs, in 2015.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 98 | 81 to 118 | |
| February | 98 | 81 to 128 | |
| March | 102 | 80 to 154 | |
| April | 109 | 80 to 202 | |
| May | 379 | 183 to 620 | |
| June | 640 | 414 to 1,004 | |
| July | 113 | 89 to 238 | |
| August | 98 | 81 to 128 | |
| September | 89 | 71 to 127 | |
| October | 99 | 81 to 157 | |
| November | 111 | 93 to 153 | |
| December | 109 | 87 to 140 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 13 years of record. Statistics published by the US Geological Survey for ST Vrain CR below Boulder CR at Hwy 119 near Longmont (site 06730525). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Saint Vrain Creek's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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