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Marston Lake North Drainageway

 

The Urban Drainage and Flood Control District (UDFCD), Jefferson County, and City and County of Denver have partnered with Jacobs Engineering Group (Jacobs) and ECI Site Construction Management, Inc. (ECI) to design and construct improvements to Marston Lake North Drainageway between South Garrison Street and Stanford Avenue and Balsam Park.

The proposed improvements are located within Jefferson County and the City and County of Denver. Nearby streets that bound the project are South Garrison Street to the west and Balsam Parkway to the east. Drainage within the project limits flows from west to east.

Project Goals

  • Develop a sustainable urban design that removes structures from the regulatory 100-year floodplain that reduces the 100-year peak flow in the Marston Lake North Drainageway and increases the capacity of the drainageway.
  • Design a healthy system that provides natural appeal that is easy to maintain.
  • Improve water quality.
  • Improve trail infrastructure.
  • Reduce the amount of open/standing water.
  • Stanford and Balsam Park improvements (at the Lake’s Lake) include removing and replacing the existing baffle drop with a sculpted concrete drop as well as a new low water crossing.

Construction Update

Work on Garrison Street is now scheduled to begin at the end of August. Garrison will be closed north of Stanford Street to complete work on concrete boxes for the drainageway. See Detour Map (PDF)

Street maintenance work is also underway for milling, paving, sidewalk and curb ramps in the area adjacent to the project site. This work is not part of the drainageway project; please look for notices and observe signage related to this construction.

Quincy Lake East Detention Pond Improvements

The project will remove the existing concrete forebays and trickle channels, existing outlet structure and pipes, and the current permanent pool. During construction, the grade in the detention pond will be modified to provide additional stormwater capacity and reduce the risk of stormwater flows spilling from the detention pond and drainageway.

Improvements will also enhance the recreational value of the detention pond:

  • The pond will be constructed with landform variability to promote greater variety in the landscape and vegetation and improve aesthetics of the pond.
  • New forebays, trickle channels, and outlet structure will be constructed with current design standards; the amount of open/standing water will be significantly reduced and the detention pond will be eligible for maintenance by UDFCD. .
  • Construct a trail system within the detention pond to provide recreational access and opportunities while also providing access to maintain the detention pond infrastructure.
  • Construction of a new diversion structure on Marston Lake North Drainageway to divert flood flows from Marston Lake North Drainageway to Quincy Lake East Detention Pond
 
Project Status: Construction

Construction is anticipated to begin in January 2019 and continue for approximately 8 months. Construction will be phased with work beginning at the downstream (east) end of the drainageway and working upstream.

During construction, portions of the park, roadways, sidewalks, and trails in the area will be closed off at different times. At least one lane of traffic and one sidewalk will remain open on Garrison Street and Stanford Avenue.

Contacts

City and County of Denver

Steve Choi, Project Manager 
Wastewater Capital Projects, Denver Public Works
303 446 3648

Cincere Eades, Project Manager
Parks & Recreation
720-913-0655

Urban Drainage & Flood Control District

Morgan Lynch, Project Manager
303-455-6277

Scott Dirschl, Construction Manager
303-455-6277

Contractor

ECI
Jeron Siegert, Project Manager
970-342-6127