Fountain Valley No 2, also known as Big Johnson, is a privately owned irrigation dam located in El Paso County, Colorado. Constructed in 1910 by the USDA NRCS, this earth dam stands at a height of 54 feet and has a maximum storage capacity of 4250 acre-feet. The dam, situated on Fountain Creek-TR, serves the primary purpose of irrigation, storing water for agricultural use in the region.

With a high hazard potential and a satisfactory condition assessment as of February 2021, Fountain Valley No 2 is regulated by the Colorado Department of Water Resources. The dam features an uncontrolled spillway with a width of 120 feet, capable of handling a maximum discharge of 4850 cubic feet per second. Despite its age, the dam continues to meet regulatory standards and undergo regular inspections to ensure its structural integrity and safety.

As a key component of the local water management infrastructure, Fountain Valley No 2 plays a vital role in supporting agricultural activities in the area. With its historical significance and continued importance in water resource management, this dam serves as a testament to the lasting impact of early irrigation projects in Colorado.