Project Background

The Little Dry Creek Drainageway watershed encompasses approximately 12.7 square miles and extends through Adams County, Jefferson County, Arvada, and Westminster. Click on this link to view the project limits. The watershed is almost completely development and planned development in the watershed consist of residential. The Little Dry Creek Drainageway is bound on the north by West 92nd Avenue and the south by West 62nd Avenue. The existing drainageway is approximately 8.7 miles long, 2.0 miles wide and generally slopes down to the southeast with slopes ranging from 0.5 percent (%) to 4%.

The purpose of the project is to update the hydrology, develop alternatives to alleviate potential flooding, and complete a conceptual design of the plan selected by the project sponsors for Little Dry Creek, Tributary B, and Shaw Heights Tributary. A Major Drainageway Plan (MDP) will include all of these items. The project also includes a floodplain analysis, which will be documented in a Flood Hazard Area Delineation (FHAD).

Key Project tasks include the following:

• Develop hydrology that reflects both the existing and the future land use elements
• Identify existing flooding and conveyance issues
• Develop drainage improvement alternatives
• Hold a public open house to discuss the project and findings
• Preliminary design of the selected alternative
• Delineate the floodplain along Little Dry Creek, Tributary B, and Shaw Heights Tributary

As areas develop, or redevelop, or roadway improvements are made, the information from this study will be used to guide the project sponsors in constructing appropriate infrastructure.

Project Sponsors