From September 11-15, 2013, Longmont experienced the most devastating flash flood event in its history. Catastrophic flooding, especially along the St. Vrain Creek, displaced hundreds of residents, and destroyed personal property, businesses and public spaces. The flooding caused extensive damage to much of our city's infrastructure and along the St. Vrain Greenway trail system.

The sign shown on this page was posted throughout Longmont to keep our community informed about recovery projects and progress on them. (Click on the sign image to open a PDF file for viewing or download.) Repairs to most areas damaged by the flooding were completed by the third anniversary of the flooding, in 2016. This included repair and rebuilding of damaged streets, parks, water resources, irrigation ditches, drainage systems, power lines and public buildings.

Since 2016, these additional projects have been completed or are underway:

• Main Street Bridge was replaced in 2017 with a longer, wider bridge that will safely convey up to 100-year flood levels.
• The damaged spillway and bridge at Golden Ponds Nature Area has been repaired and is expected to reopen to users in late August 2018.
• South Pratt Parkway Bridge replacement is underway and scheduled for a late 2018 completion. As with Main Street Bridge, this new bridge will also be longer and wider to safely convey up to 100-year flood levels.
• The St. Vrain Greenway is being restored through work on Resilient St. Vrain, Longmont's extensive, multi-year project to fully restore the flood-damaged trails and improve the area surrounding the creek to protect people and property from future flooding. View a map of trails at LongmontColorado.gov/trail-status.
• Dickens Farm Nature Area is expected to begin construction in 2018, with completion estimated for 2019.

• For details about specific recovery projects, contact Public Works & Natural Resources

• For information about boundaries of the 2013 flood (or other flood events), contact Longmont's Floodplain Administrator

• Aprenda sobre el Proyecto Resiliencia St. Vrain. Para información en Español llame al 303-651-8416

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Story Map of the 2013 Flood

Looking for Flood Insurance Rate Maps (FIRMs) or floodplain maps? Visit the St. Vrain Floodplain Updates webpage >

Is your property located within a floodplain? Find out with Longmont's Floodplain Inquiry Map >

Take a geo-coded, photographic tour of the 2013 flood area with this story map (or click the larger photo, below).

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Videos and Photos of the 2013 Flood

Revisit the 2013 flood through photos and videos >

The Colorado Resiliency & Recovery Office produced an online map book, 2013 Colorado Flood Recovery: Three Years of Progress, that provides a statewide look at damage and recovery from the flood.