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Saint Vrain Creek at Lyons

Highest listed crest 13.00 ftFlood stage 8.0 ft9 crests since 2013

The Saint Vrain Creek at Lyons crested at major flood stage 1 time among the 9 crests the National Weather Service lists from 2013 to 2021. The highest, 13.00 ft on September 12, 2013, was major flooding, 5.00 feet above flood stage.

The gauge

Highest listed crest
13.00 ft
September 12, 2013; 23,000 cubic feet per second
Flood stage
8.0 ft
Major flooding from 10.5 ft
Crests at major
1
6th of 100 gauges in Colorado
Most recent flood crest
September 12, 2013
13.00 ft, major flooding
Location
Boulder County
Near Longmont (9.1 mi), Boulder (13.4 mi)
Identifiers
NWS LNSC2
No USGS station

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Saint Vrain Creek at Lyons
Action stage7.51Jun 1, 2014The level at which the NWS or its partners begin to take action
Flood stage (minor)8.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage9.50—Some inundation of structures and roads near the stream
Major flood stage10.51Sep 12, 2013Extensive inundation of structures and roads

Every listed crest

9 crests from 2013 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Saint Vrain Creek at Lyons, 2013 to 2021 468101214ft Flood stage 8.0 ftMajor 10.5 ft Sep 12, 2013: 13.00 ft, major flooding; 23,000 cubic feet per secondJun 1, 2014: 7.53 ft, action stage; 1,420 cubic feet per secondJun 12, 2015: 7.06 ft, below flood stage; 1,480 cubic feet per secondJun 13, 2016: 6.19 ft, below flood stage; 984 cubic feet per secondJun 18, 2017: 5.24 ft, below flood stage; 1,000 cubic feet per secondMay 28, 2018: 4.39 ft, below flood stage; 613 cubic feet per secondJul 2, 2019: 5.15 ft, below flood stage; 1,030 cubic feet per secondJun 4, 2020: 4.37 ft, below flood stage; 567 cubic feet per secondJun 7, 2021: 5.36 ft, below flood stage; 1,090 cubic feet per second Highest, 13.00 ft, Sep 12, 2013 20152020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Saint Vrain Creek at Lyons 2010s: 1 1 2020s: 0 2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Saint Vrain Creek at Lyons
1Sep 12, 201313.00+5.00Major23,000
2Jun 1, 20147.53−0.47Action1,420
3Jun 12, 20157.06−0.94Below flood stage1,480
4Jun 13, 20166.19−1.81Below flood stage984
5Jun 7, 20215.36−2.64Below flood stage1,090
6Jun 18, 20175.24−2.76Below flood stage1,000
7Jul 2, 20195.15−2.85Below flood stage1,030
8May 28, 20184.39−3.61Below flood stage613
9Jun 4, 20204.37−3.63Below flood stage567

Gauges on the Saint Vrain Creek

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Saint Vrain Creek
Lyons this gaugeCO8.013.00 ft, Sep 12, 20131
PlattevilleCO9.010.03 ft, May 10, 20150

Other gauges in Boulder County

Flood gauges in Boulder County
North 75TH St.8.010.60 ft, Sep 13, 20131
Broadway St8.08.18 ft, Sep 12, 20130
Nederland5.55.50 ft, Jun 22, 19950
Orodell4.04.31 ft, Jun 6, 19210
Jamestown4.54.60 ft, Apr 30, 19990
Nederland4.55.37 ft, Jun 2, 19140
Eldorado Springs5.05.43 ft, Sep 12, 20130
Lyons6.06.50 ft, May 29, 19950

Boulder County: every hazard · River floods across the country · Colorado

NOAA National Water Prediction Service, gauge LNSC2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.