Mountain Dell Projects

Project Overview

The Sinclair Wash Drainage Improvement Project in Mountain Dell improves the community’s drainage to accommodate a 100-year flood event. When completed, the project removes 23 homes and the community’s water system from the floodplain. Key requirements of this project include securing drainage easements and coordinating with the City of Flagstaff. The preliminary design for the Sinclair Wash Drainage Improvement Project is currently at the 60 percent engineering level. If the key requirements are met and funds are available, then the FCD will complete the project by fall 2019.


In 2016 the Coconino County Flood Control District (FCD) completed Initial Engineering Assessments (IEAs) in four areas of the County deemed "Special Flood Hazard Areas" by the Federal Emergency Management Agency (FEMA). An IEA is a tool that the FCD uses to better understand flood risks so that initial, conceptual flood mitigation alternatives can be identified and evaluated.

Based on this IEA information, the FCD Board of Directors approved preliminary engineering and feasibility studies for the conceptual Mountain Dell/Sinclair Wash Drainage Improvement Project.