The City and County of Denver and the Urban Drainage and Flood Control District (UDFCD) are conducting an Outfall System Plan Study of stormwater management in the Montclair watershed. The Montclair drainage basin is over 9 square miles and is divided into the lower portion downstream of Ferril Lake in City Park, and the upper portion upstream of City Park.
The Montclair watershed is Denver’s largest drainage basin without an open waterway. The basin is fairly flat and prone to flooding at certain low points. The current stormwater drainage system, which includes pipes and street capacity to convey water safely, needs to be improved in some key areas. The Montclair Basin has been identified as a priority basin for storm drainage improvements and has also been identified as a priority basin for water quality improvement. Modeling of the hydrology in the basin is up to date and complete.
Rain that falls in the drainage basin becomes storm runoff that flows in a northwesterly direction, ultimately draining into the South Platte River. Some improvements have been proposed and are being designed and implemented in the Lower Montclair Basin. The current effort is focusing on evaluating alternatives to address flood management and water quality in the Upper Montclair Basin, upstream of Ferril Lake.
The Upper Montclair Basin includes Congress Park, South City Park, the southern part of Park Hill, Hale, Montclair, Mayfair, Hilltop, Crestmoor, and Fairmount Cemetery, as well as small portions of Washington Virginia Vale and Lowry (west of Quebec).
The second phase of this study began in 2016, and the team is currently working with the public to gather data on existing conditions. The study phase is expected to conclude in 2018. The design phase will begin in 2018 with phased construction dates to be determined, no earlier than 2020.