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4.5Update Floodplain Boundaries

Progress

  • Not started
  • Planning
  • Implementation
  • Continuous
Late

Preliminary FIRMs to replace the 2012 FIRMs has been delayed by FEMA due to an unresolved appeal. These maps now plan to be effective by summer 2024. These maps replace the 2012 FIRMs for St. Vrain Creek and Left Hand Creek. The floodplain maps for 2 of the remaining creeks that run through Longmont will be updated in 2024 (Spring Gulch No1 and No 2). Dry Creek 1 will be updated as soon as the budget will allow.

Adopt updated floodplain boundaries and integrate into short and long-range planning citywide.

There are 5 creeks with floodplain maps within Longmont's jurisdiction. Revisions to St. Vrain and Left Hand Creeks are complete. Flood Insurance Studies (including maps and models) for both Weld and Boulder Counties will be FEMA effective on September 26 and October 24, 2024, respectively. Spring Gulch No. 2 is in process, Spring Gulch No. 1 floodplain will be updated in 2025 and the update of Dry Creek No. 1 will be completed in 2025.

Tasks

What's left to do?

  • Todo12/31/2023

    Spring Gulch No. 2 Floodplain Study

    Study was issued a NTP on 8/22/23.

  • Todo6/3/2024

    Spring Gulch No. 1 Floodplain study

    Consultant has provided a proposal for this work which includes the Sugar Mill area. Some portion of this study may be started in 2024.

  • Todo10/31/2025

    Dry Creek Floodplain Study

    Longmont has not requested a proposal for this project to date.

What are we doing?

  • Todo3/31/2024

    Preliminary FIRMs

    Latest estimate for the new floodplain maps (FIRMs) to be effective is Spring 2024

Timeline

9/2023 → Continuous

Guiding Principle

Responsible organizations

Type of Strategy

Initiation Period

Contact persons

  • Monica Bortolini
    Senior Civil Engineer/Floodplain Administrator
    Public Works and Engineering
Information updated 07/12/2024