Lion is a privately owned dam located in Johnson, Wyoming, near the city of Arvada. Built in 1964, this Earth dam stands at a height of 31 feet and serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a normal storage capacity of 54 acre-feet, Lion Draw reservoir covers a surface area of 6 acres and has a drainage area of 0.

Despite its low hazard potential, Lion Dam is currently in poor condition as assessed during its last inspection in June 2018. The dam has an uncontrolled spillway with a width of 40 feet, and no outlet gates. It is regulated by the State of Wyoming through the State Engineer's Office (SEO), and undergoes regular inspections with a frequency of 5 years to ensure compliance with state regulations and enforcement.

Located within the Congressional District 00 of Wyoming, Lion Dam poses a moderate risk (3) according to its risk assessment. Despite its condition, the dam continues to provide valuable water resources for fire protection and agricultural purposes in the region. Enthusiasts interested in water resource management and climate change impacts on infrastructure will find Lion to be a significant point of interest in the state's water management efforts.