Silver Spruce #2 is a privately owned earth dam located in Lyons, Colorado, along the South St. Vrain Creek. Built in 1958, this recreational dam stands at 18 feet high and has a storage capacity of 56 acre-feet, with a normal storage level of 33 acre-feet. The dam spans 293 feet in length and covers a surface area of 6 acres.

Despite its low hazard potential and satisfactory condition assessment, Silver Spruce #2 undergoes regular inspections every 6 years to ensure its safety and structural integrity. The dam features an uncontrolled spillway with a width of 22 feet and a maximum discharge capacity of 496 cubic feet per second. Although it meets guidelines for emergency action plans and inundation maps, its risk assessment is classified as moderate.

Water resource and climate enthusiasts will find Silver Spruce #2 an intriguing structure for recreational purposes, nestled in the picturesque Boulder County. Its historical significance, engineering design by John A. Lunsford, and state-regulated operation make it an essential part of the water management system in the region. With its location along a scenic waterway, the dam offers both practical functions and aesthetic appeal for visitors to enjoy.