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Ashland Reservoir Tank Replacement

Two new spaces for storing treated water

Denver Water is improving the safety and reliability of its Ashland Reservoir site by building two new underground storage tanks.Improvements to Denver Water's delivery system make it possible to reduce storage at the site by 21 million gallons.

ashland reservoir tank replacement

Tanks' top stats

20 million

gallons total storage


cubic yards concrete in a roof


roof diameter in feet

39.7596699, -105.0625498

Why it’s important

The Ashland site dates back to the 1890s, when it had open air reservoirs with earthen bottoms. In the 1910s and early 1920s, concrete floors and wood roofs were added to the reservoirs. The wood roofs were replaced with precast concrete in the 1960s and early 1970s.

Despite routine maintenance and significant repairs, the tanks experienced leaks, and some of the precast roof sections cracked. The tanks reached the end of their useful lives, and continued repairs would have been impractical.

How it affects our customers

The project was phased for contractor Western Summit to demolish and replace one tank at a time. Soil removed from the site has been hauled for storage to 20th and Quail Street, near the Moffat Treatment Plant.The new, circular tanks are smaller in size and footprint, allowing space for a larger landscaped area on the south side of the property. Crews are installing a new decorative fence.

Support local businesses

We recognize work like this has negative impacts on neighborhood businesses, so please support these establishments, many of which are offering special deals during construction.

Ashland site update: June 2017

Encouraged by neighbors and with support from the City of Wheat Ridge, we’re proud to announce we’ve found resources and made necessary plan and schedule adjustments to keep the old well house building as a permanent (albeit non-functioning) component of the site.

Ashland site update: March 2017

  • Both circular underground tanks are fully constructed. Crews are putting the final touches on Tank No. 1, which will be put into service about mid-March.
  • Backfilling continues on-site, bringing back a portion of the about 80,000 cubic yards of earth excavated to reconstruct the tanks. We expect crews to continue until the end of March.
  • Conduit 3, one of the large underground pipes used to transport water, is out of service and water is delivered through Conduit 1. When ready, reconnecting the conduit require a one-lane closure on 26th Avenue, which should last several days.
  • In mid-March we are tentatively planning to work in the intersection of North Depew Street and West 29th Avenue. Crews will excavate deep underground to install a concrete vault, which allows staff access to the conduits under the street. West 29th Avenue will be open for the majority of this work, but some short-term closures will be required toward the end of the installation. We estimate this work will take about four months.
  • Toward the end of March we plan on performing maintenance in an existing valve vault beneath 29th Avenue just west of Sheridan Boulevard. We estimate this work will take about one week.
  • Installation of the decorative iron perimeter fence is set to start in April and will be performed in phases. Installation will most likely start on the west side of the property, and we do not expect to need access to any neighbors’ properties. If we do, we will contact neighbors directly to ask for permission.
  • Denver Water is planning a large utility maintenance project that will significantly impact the intersection of 29th Avenue and Sheridan Boulevard starting in early April through early July. We’re working with the cities of Wheat Ridge and Denver, as well as the Colorado Department of Transportation, to minimize public inconvenience, but we expect to close the intersection for several weekends.

Anticipated timeline

In summer 2017, crews are backfilling the site and doing work on landscaping, paving and sidewalks. Seeding and completion of construction follow in the fall.