Stillwater, located in Franktown, Colorado, is a privately owned dam on Antelope Creek with a primary purpose of recreation. Built in 1999 by Woodward Clyde, this earth dam stands at a height of 27 feet and stretches 1100 feet in length, creating a storage capacity of 326 acre-feet and serving as a popular spot for outdoor activities. The dam boasts a spillway width of 8 feet and a low hazard potential, with a fair condition assessment as of 2013.

Despite its modest size and purpose, Stillwater plays a key role in the local water resource management, offering a surface area of 22 acres for recreational use and a drainage area of 1 square mile. With a maximum discharge capacity of 105 cubic feet per second, the dam provides a valuable water source for the surrounding community while also enhancing the natural landscape. The dam's inspection frequency of 6 years ensures regular maintenance and upkeep to uphold its structural integrity and safeguard against potential risks, contributing to the overall sustainability and resilience of the region's water infrastructure.