Union #2, also known as Kountze Lake or Belmar Park Lake, is a local government-owned recreational reservoir located in Lakewood, Colorado. Built in 1982, this earth dam stands at a height of 17 feet and has a storage capacity of 250 acre-feet. The primary purpose of Union #2 is flood risk reduction and recreation, with a surface area of 15 acres and a maximum discharge of 2750 cubic feet per second.

Managed by the Colorado Division of Water Resources, Union #2 has a low hazard potential and a moderate risk assessment rating. Despite not being rated for condition assessment, this dam is regularly inspected every six years to ensure its safety and functionality. The spillway, measuring 128 feet in width, is uncontrolled, and the dam has not been modified since its completion.

While Union #2 plays a crucial role in flood risk reduction for the Weir Gulch-OS stream, it also offers recreational opportunities for the community. With its scenic location and ample storage capacity, this dam serves as a vital resource for water management and outdoor enjoyment in Jefferson County, Colorado.