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Upper Montclair Basin: Stormwater Systems Study

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.

Study area

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).

Study goals

  • Drainage improvements in the near term
  • Long-range drainage improvements
  • A framework for resiliency in land use practices and green infrastructure

Map of Upper Montclair Basin and study area, from City Park in north to Fairmont Cemetery in south


Upper Montclair Basin study timeline from 2016 to 2020

Project Status: Concept Design

The study was completed in the summer of 2018. Two projects have moved into the concept design phase, with continued community engagement and technical evaluation of projects identified through the study process. The concept design is anticipated to conclude in Spring 2019.

Meeting Materials

Thanks to all who attended the latest meeting on the 16th Ave pipe design and green infrastructure project.

April 10, 2018

Hale Parkway

Meeting Summary (PDF)

Focus on E 16th Avenue, Batavia Place and the surrounding street network

The same materials were presented at three community meetings. 


Jennifer Williams 
Project Manager, Denver Public Works