Sullivan Reservoir #3, also known as Wheeler Lake, is a private water resource located in Weld County, Colorado. Built in 1905 for irrigation purposes, this earth dam stands at a height of 11 feet and has a storage capacity of 190 acre-feet. With a surface area of 18 acres, it is situated along the South Platte River and is regulated by the Colorado Division of Water Resources.

Despite its age, Sullivan Reservoir #3 is considered to have a low hazard potential and is in a satisfactory condition as of its last inspection in September 2013. The dam features an uncontrolled spillway and has a maximum discharge capacity of 120 cubic feet per second. With a moderate risk assessment rating, the reservoir is monitored regularly for any potential risks or hazards.

Managed by a private entity, Sullivan Reservoir #3 serves as an essential water source for agricultural irrigation in the area. It plays a vital role in supporting local farming activities and ensuring the availability of water resources for the community. As a key component of the water infrastructure in Weld County, this reservoir stands as a testament to the importance of sustainable water management in the face of changing climate conditions.