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38th & Holly Detention Pond Improvements


The City and County of Denver is making improvements to the existing 38th & Holly Detention Pond. During small and larger storm events, water collects in Holly Street at depths up to approximately 1.5 feet. The water then overtops the pond embankment along Holly Street to enter the pond and causes severe erosion to the embankment, creating on-going maintenance concerns and repairs.

dirt and erosion around detention pond and storm infrastructure

The project will construct a new rundown to prevent future erosion, provide stormwater quality, and significantly re-landscape the detention pond and plant trees for pedestrian shade. When the improvements are complete, the project will safely direct stormwater into the detention pond while improving the water quality and the aesthetics for the surrounding neighborhood.

Photo: Erosion from July 2015 storm event


Detention Pond Improvements

map of project area with labeled improvements

Site plan | Click to enlarge

Project Status: Construction

The final design for the 38th and Holly Detention Pond Improvements was completed in March of 2018. Construction began in October 2018.


City and County of Denver

Paul Bountry, Construction Engineer, P.E.
Wastewater Capital Projects Management, Denver Public Works
303 446 3719 |

Shawn Callahan
Project Inspector

Contractor: SEMA Construction, Inc.
Brandon Torrez, Project Engineer, Rocky Mountain District


Project Updates

Construction — January 2019

aerial view of detention area in show, showing new step structure for outfall 

Construction — December 2018

concrete outfall structure at ground level in sunken pond 

Construction beginning — October 2018

concrete pouring at base of pond


Design: 2016–2018

Construction: Fall 2018 to Spring 2019

Construction is expected to begin in Fall 2018 and last between four and six months. During construction, traffic control signs will be used to close portions of sidewalks and paths in the area. It is anticipated that there will be intermittent closures to Holly Street between 38th Avenue and 39th Avenue as utility work is performed. Traffic will be detoured onto adjacent streets during this time.

This will be an active construction site with open excavations and equipment in the neighborhood. Caution should be exercised near all construction operations.

Northeast Park Hill Coalition Meeting — April 12, 2018

Denver Public Works and Denver Parks & Recreation presented the project at North Park Hill RNO meeting.