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U.S. Army Corps of Engineers Feasibility Study

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USACE Army Corps project timeline


In early 2017, the U.S. Army Corps of Engineers (USACE) began conducting a feasibility study of the section of the St. Vrain Creek running from the BNSF railroad bridge to Lykins Gulch. The feasibility study builds upon the existing work done through the Resilient St. Vrain project.

The purpose of the Corps' analysis was to locate an area within the study section that could possibly qualify for an approximately $15 million project as part of the USACE's 205 program. Of that $15 million price tag, 65 percent (approximately $10 million) of the cost would be paid for by USACE, with 35 percent (approximately $5 million) contributed by Longmont.

Section 205 of the Flood Control Act of 1948 allows the USACE to construct or improve site-specific flood risk management projects. If a qualifying project area is determined, USACE would oversee the planning, design and construction of the project while coordinating closely with Longmont.

In late August 2019, the USACE released its draft report and Environmental Assessment (EA) on options for work in the area upstream of the BNSF railroad bridge to Hover Street. The report is the result of the feasibility study begun in early 2017. The report shares USACE’s preferred alternatives for work in its study reach (which corresponds with the Resilient St. Vrain project reach known as Izaak Walton Reach 2).


February 16, 2017: USACE representatives introduced the feasibility study and its timeline to the public during an open house. Public comments were accepted on Phase 1 of the feasibility study through March 17, 2017. That public comment period is now closed.

View the USACE open house presentation (3 MB PDF).

August 21, 2018: Representatives from the USACE provided an update to City Council as part of the overall Resilient St. Vrain Project update. Evaluation of feasible design alternatives continues and USACE currently hopes to have a draft report of their findings for public review in spring 2019. A public meeting is planned once that draft report is available for review and the project moves into the Environmental Assessment phase.

View a video of the USACE's portion of the presentation (start at 1:50:00)

View slides from the USACE portion of the presentation (PDF)

August 27, 2019: The USACE released its draft report and Environmental Assessment (EA). The report materials are available online at Public comments were accepted through Oct. 4, 2019. That public comment period is now closed.

Flood Risk Management Study Public Meeting

September 18, 2019: The USACE held a public meeting at the Longmont Museum to provide details of the study, share next steps in the process, and seek public comments on the recommended flood risk management plan.

View the USACE presentation (19 MB PDF) sharing the analysis process and alternatives considered, along with next steps and proposed project timeline

View the USACE posters (15 MB PDF) that were on display at the public meeting

City of Longmont staff were on hand to explain how the proposed USACE project meshes with the overall Resilient St. Vrain project, as well as to answer questions on future RSV phases.

View the City presentation (PDF) on the Resilient St. Vrain project

The draft report and EA was available for public review and comment through Oct. 4, 2019. That public comment period is now closed. The report materials may be viewed online at

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