Mesa Creek #4, also known as Water Dog, is a private irrigation dam located in Mesa, Colorado. Built in 1892, this Earth type dam stands at a height of 22 feet and has a storage capacity of 857 acre-feet. Serving primarily for irrigation purposes, this structure has a significant hazard potential but is currently assessed to be in fair condition as of June 2020.

With a spillway width of 6 feet and a maximum discharge capacity of 777 cubic feet per second, Mesa Creek #4 has undergone modifications in 1973 to enhance its hydraulic and structural integrity. The dam plays a crucial role in water management and recreation in the area, making it a key feature for water resource and climate enthusiasts interested in understanding the impact of such infrastructure on local ecosystems and communities.

Despite its age, Mesa Creek #4 remains a vital component of the water system in Mesa County, Colorado. Regular inspections and maintenance ensure its continued functionality, with a moderate risk assessment rating of 3. As climate change continues to affect water resources, the management and upkeep of structures like Mesa Creek #4 become essential in safeguarding both the environment and the livelihoods of those who depend on its water supply.