Saint Vrain Creek below Longmont, CO
River level and flood forecast · Boulder County
Normal9.5 ftas of Mon 1 PM
The river is 6.0 ft below flood stage (15.5 ft).
Flow: 27 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 5 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 18.5 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 15.5 ft |
| Action stage | 15 ft |
| Record crest (May 9, 2015) | 14.56 ft |
What floods at each level
From the National Weather Service, highest first.
- 18.5 ftMajor, extensive flooding occurs as a wide expanse of the creek spreads out horizontally across the floodplain.
- 17.5 ftFlooding affects large areas along the creek with numerous roads and structures impacted.
- 16.5 ftThere is significant flooding of agricultural land along the creek.
- 15.5 ftParks and agricultural fields and parks near the creek flood. Railroad tracks may be impacted.
- 15 ftWater begins to overflow into the lowest areas adjacent to Saint Vrain Creek below its confluence with Boulder Creek.
Highest crests on record
- 14.56 ft — May 9, 2015
- 13.44 ft — May 18, 2017
- 12.97 ft — June 1, 2014
- 12.24 ft — July 2, 2019
- 12.17 ft — June 14, 2016
Recent crests: 12.08 ft (June 7, 2021) · 11.2 ft (June 6, 2020) · 12.24 ft (July 2, 2019) · 11.31 ft (June 19, 2018) · 13.44 ft (May 18, 2017)
Up and down the river, and nearby
- South Platte River at Fort Lupton, CO
- Boulder Creek (CO) at North 75TH St., CO
- Big Thompson River (CO) at Loveland, CO
- Sand Creek (CO) near Commerce City, CO
- Cache La Poudre River (CO) at Fort Collins, CO
- Clear Creek (CO) at Golden, CO
- North Clear Creek (CO) below Blackhawk, CO
- South Platte River at Englewood, CO
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SVLC2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.