Last Chance & Nevada Ditch Diversions

Last Chance & Nevada Ditch Diversions


Arapahoe and Jefferson Counties, Colorado

Centennial Water and Sanitation District contracted with Deere & Ault Consultants, Inc. to provide engineering services for the construction of a 6,480 acre-foot South Platte Reservoir.


Inverted siphon and turnout on Nevada Ditch.

To fill this reservoir on a year-round basis, Deere & Ault staff was contracted to design modifications to the Last Chance Ditch and Nevada Ditch. Modifications to these ditches included: 

  • New main ditch measuring flumes.
  • Modifications to the valve works and energy dissipation structures at the downstream end of the Chatfield Reservoir outlet pipes.
  • Construction of buried ditch conveyance conduits.
  • New diversion facilities.
  • Remote operating and monitoring equipment.
  • Construction of inverted siphons conveying ditch flows across a 25,000 cfs bypass channel, which Deere & Ault’s staff designed as part of the reservoir project.

Deere & Ault’s staff guided this project through intensive review by the ditch company’s engineer and major shareholder, Denver Water. Coordination and permit activities also involved the U.S. Army Corps of Engineers, Colorado Department of Transportation, and the South Suburban Parks and Recreation Department.

Deere & Ault’s staff provided construction management services associated with the improvements to both ditches.

Client:  Centennial Water and Sanitation District

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