Mortenson Completes $47.4M Recreation Modification at Chatfield Reservoir  

Mortenson’s scope of work included the addition of a new 127-foot-long bridge.

Mortenson, a top-20 U.S. builder, developer, and engineering services provider with nearly four decades of experience in Colorado, today announced substantial completion on the $47.4 million Chatfield Storage Reallocation – Recreation Modification Project. Upon final approval requirements from the U.S. Army Corps of Engineers, the project will have created an additional 20,600-acre-feet water storage in the flood control reservoir in Littleton.

Mortenson partnered with the Chatfield Reservoir Mitigation Company, Inc., architects Barker Rinker Seacat (BRS) and HDR, Inc. for the recreation modification scope of work to reallocate the space around Chatfield Reservoir to accommodate additional water storage without compromising flood control function, which represented up to 12 vertical feet of water storage. The additional storage will be used by municipal and agricultural providers to help meet the increasing needs of the state. 


“Successful completion of this key portion of the Chatfield Storage Reallocation Project was critical to meet the Front Range’s growing water demand,” said Tim Feehan with Chatfield Reservoir Mitigation Company, Inc. “By leveraging the water supply space within the existing reservoir, we are proactively addressing flood control planning, creating better access to renewable water supplies and maintaining fisheries and wildlife habitat. As our construction partner, Mortenson’s infrastructure expertise and collaborative approach to problem-solving proved invaluable in delivering this project on time and within the allocated budget.” 

Along with the increased water storage capacity, Mortenson’s scope included the addition of new recreational facilities and improved infrastructure, including a new marina, to support an increase in visitors to the popular area. Key elements of the 335-acre construction effort included:  

  • Over 1.3-million cubic yards of mass excavation and grading, 39,000-cubic yards of dredging from barges for a new marina, and 28,000-cubic yards of on-site mining of beach sand. 
  • Over 6,020-linear feet of storm sewer ranging in size and type, along with sections of perforated pipe to enhance site drainage. 
  • Nearly 12,000-linear feet of sanitary storm sewer, which includes a number of gravity and force main sewers. The sanitary utilities network also included two lift stations, a number of structures, several building tie-ins and a land-to-water bore, which required divers. 
  • Nearly 27,000-linear feet of water utility lines ranging in size and material types, with several building tie-ins.  
  • Over 108,000 square yards of concrete and asphalt paving for new roadways, sidewalks, trails and a concrete boat ramp. 
  • Demolition of an existing bridge and construction of a new 127-foot-long bridge 
  • A total of four land-to-water blind bores that required divers to retrieve equipment and make connections. 


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