A federal permit granted in 2008 allowed the reservoir to expand to 72,000 acre-feet for the original 16,000 acre-feet. There is 2,000 acres of open space which may be developed for fishing, hiking, cycling and non-motorized boating after planning and funding.

The reservoir serves the Parker Water Sanitation District area along with Castle Rock, Castle Pines and Stonegate.

"The project is a significant accomplishment for Parker Water and Sanitation District, its customers and the entire south metropolitan area. Congratulations is due all around," Frank Jaeger, PWSD district manager, said.