Background 

Comanche Creek is a northward-flowing stream with source areas in the Platte River-Arkansas River divide area east of the Front Range. It is located approximately 20 miles east of the E-470 corridor. The Comanche Creek watershed, as measured at the Arapahoe County/Adams County line, covers approximately 85 square miles. Little Comanche Creek parallels Comanche Creek with a watershed area of approximately 16 square miles. The Master Drainageway Plan (MDP) focuses on the portion of the both creeks and their tributaries within Arapahoe County—approximately 32 square miles.

View a enlarged map of the study area

Why are Master Drainage Plans Important?

Many eastern rural stream beds are dry several months of the year, which is why it’s important to evaluate how a stream bed will convey flood waters during a precipitation event. Studies ensure that as development occurs, structures are built in safe zones. They also identify potential risks for how structures like culverts, bridges and road crossings will support the flow of water. Studies indicate where stream stabilization may be needed to protect natural environments and wildlife habitats. 

Project Purpose

The purpose of the project is to complete a MDP to be implemented as developments occurs in the Comanche Creek watershed. The watershed is primarily undeveloped and the MDP will be used to provide guidance for future construction as development occurs. The project team will delineate the 100-year floodplain and investigate flood-prone areas, drainage problems, stream stabilization and roadway crossing structure adequacy. The team will assess degradation along the Creek and look for areas that may require bank stabilization. The team will also perform an environmental assessment to locate wetlands, riparian areas and nesting sites.

Looking Ahead

Public meetings/Open House will be held to answer questions and gather comments from the public as it regards the study area. It is anticipated the Master Drainage Plan will be ready for public review by Spring of 2022. Along with the Master Drainage Plan, a community report will also be developed for public review.

Contact Us

For additional information or questions about this plan, please contact James Beall at: jbeall@arapahoegov.com