Saint Vrain Creek at Lyons
Colorado — Water Level & Flood Stage
Located in Boulder County, Colorado on the Saint Vrain Creek. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: LNSC2). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
10.5 ft
Moderate Flood
9.5 ft
Minor Flood
8 ft
Action Stage
7.5 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
12 ft
This is an extreme, life threatening flood. Roads crossing the creek downstream through Longmont and all highways into Lyons will likely be flooded and impassable.
11 ft
This is a major, life threatening flood. There is extensive flooding from Lyons downstream through Longmont impacting numerous roads and structures.
10.5 ft
Houses and businesses along the creek from Lyons downstream through Longmont flood as do roads along and crossing Saint Vrain Creek.
10 ft
A number of roads along and crossing Saint Vrain Creek in Lyons are impacted by flooding. Water overtops driveways and parking lots near Main Street in Longmont.
9.5 ft
Flooding affects a significant area in Lyons with a number of houses along the creek impacted. Saint Vrain Creek floods low lying areas downstream in Longmont.
9 ft
Several houses east of 2nd Avenue in Lyons flood.
8.5 ft
Structures flood in low lying areas next to Saint Vrain Creek in Lyons. Lowland and meadow flooding occur along the creek downstream through western Longmont.
8 ft
The creek rises to the base of structures and yards flood east of the 2nd Avenue bridge in Lyons.
7.5 ft
There is lowland and meadow flooding in and downstream of Lyons.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Sep 12, 2013 | 13 ft | 23,000 cfs |
| Sep 12, 2013 | 13 ft | 23,000 cfs |
| May 31, 2014 | 7.53 ft | 1,420 cfs |
| May 31, 2014 | 7.53 ft | 1,420 cfs |
| Jun 11, 2015 | 7.06 ft | 1,480 cfs |
About This Gauge
NWS LID
LNSC2
River
Saint Vrain Creek
County
Boulder, CO
Coordinates
40.2179°N, 105.2603°W
Get Flood Alerts for Saint Vrain Creek
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Saint Vrain Creek at Lyons?
The Saint Vrain Creek at Lyons gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Saint Vrain Creek at Lyons?
The NWS-defined flood stage for Saint Vrain Creek at Lyons is 8 feet. Action stage begins at 7.5 feet. Moderate flooding starts at 9.5 feet, and major flooding at 10.5 feet.
How do I get alerts when Saint Vrain Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Saint Vrain Creek at Lyons to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Saint Vrain Creek at Lyons gauge located?
The gauge is located in Boulder County, Colorado at coordinates 40.2179°N, 105.2603°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: CO Division of Water Resources
- Stage may be affected by ice during winter months.