Wasson, also known as Mountain Supply #22, is a privately owned dam located in Larimer County, Colorado, near the city of Wellington. Completed in 1965, this earth-type dam stands at a height of 23 feet and has a maximum storage capacity of 371 acre-feet. Its primary purpose is irrigation, serving the Cache La Poudre River-TR watershed with a normal storage capacity of 231 acre-feet.

The dam has a low hazard potential and is in satisfactory condition, as of the last inspection in August 2019. It has an uncontrolled spillway with a width of 25 feet and a maximum discharge rate of 526 cubic feet per second. While it is regulated and inspected by the Colorado Division of Water Resources, Wasson does not have a designated Emergency Action Plan in place. The risk assessment for the dam is moderate, with a rating of 3 out of 5.

Located in a scenic area close to the Cache La Poudre River, Wasson serves as a vital water resource for irrigation purposes in the region. Its historical significance and operational efficiency make it a noteworthy structure for water resource and climate enthusiasts to study and appreciate in the context of Colorado's water management practices.