Project Overview

The City of Boulder is developing a flood mitigation plan for the Upper Goose and Twomile Canyon Creek area. In September 2013 the area flooded, causing damages to public and private properties. Six inches of rain fell in a 24-hour period. Total damages exceeded $39,000,000 in the Twomile Canyon and Goose Creek watersheds alone.

Development over time within these areas changed the way stormwater moves. Most of the development within the Twomile Canyon and Goose Creek floodplains occurred before to the city’s adoption of floodplain regulations and drainage system requirements. There are also limited drainage and flood control easements across private properties that make it difficult for much needed improvements to happen.

The city conducted a study to review drainage conditions within the Upper Goose and Twomile Canyon Creek floodplains and develop a list of projects and priorities to minimize flood damage risk in the future. This plan will support the City of Boulder with strategies to fund and build improvements that will increase protection of public and private properties, reduce potential damages due to flooding and improve the condition of the Upper Goose Creek and Twomile Canyon Creek corridors.

Community Engagement

Dec. 7, 2022 - Information Session

On Dec. 7, 2022 we held an information session to meet the new project manager for the Upper Goose & Twomile Canyon Creek flood mitigation project, learn where we are in the project process and ask questions. An in-person info session will be held in early 2023.

Jan. 25, 2021 Water Resources Advisory Board Meeting

City staff presented the recommended plan to the WRAB which included proposed improvements based on the alternatives analysis and community engagement that was completed as part of the flood mitigation study.

Mar. 18, 2019 Water Resources Advisory Board Meeting

City staff presented an update on the Upper Goose and Twomile Canyon Creek flood mitigation study to the Water Resources Advisory Board at their March 18, 2019 meeting. At this meeting, staff informed the WRAB how community feedback on the initial flood mitigation alternatives has helped shape the study process and discussed revisions made to the alternatives being evaluated.

Goose Creek and Twomile Canyon Creek Flood Mitigation Slideshow