The Willow Creek Tributaries FHAD and Major Drainageway Plan (MDP) study area covers approximately 4.9 square miles spanning from the Englewood Dam in the City of Centennial to just south of C-470 in Douglas County and the City of Lone Tree. The FHAD and MDP studies provide detailed analysis for tributaries that flow into Willow Creek, not including the main stem of Willow Creek itself. These drainageways include Acres Green Tributary, Fox Hill Park Tributary, Homestead Tributary, Homestead Farms Tributary, Jamison Tributary, Kettle Tibutary, Phillips Tributary, Spring Creek Tributary, Trenton Outfall Tributary, West Spring Creek, Willow Creek East Tributary, and the Willow Creek Direct Flow Areas. The funding sponsors of this project are the Mile High Flood District (MHFD), Southeast Metro Stormwater Authority (SEMSWA), the City of Lone Tree, and Douglas County. Additionally, the South Suburban Parks and Recreation District (SSPRD), Southgate Water and Sanitation Districts, and Arapahoe County provide direction as project stakeholders.

The primary goals for the Willow Creek Tributaries FHAD and MDP are to update the hydrology for tributaries to Willow Creek upstream of the Englewood Dam and provide flood hazard delineations. This effort also seeks to identify opportunities to promote stream health and resiliency, reduce flooding, improve water quality, and reduce long-term maintenance needs.