Kolling Dam; Mike 2 is a private earth dam located in Hettinger, North Dakota, with a primary purpose of fire protection, stock, or small fish pond. Constructed in 2007 by the USFWS, this dam has a height of 19 feet and a storage capacity of 99.9 acre-feet. It is regulated by the North Dakota State Water Commission and is inspected, permitted, and enforced by state agencies, ensuring its safety and compliance with regulations.

Situated on the Heart River in the St. Paul District, Kolling Dam; Mike 2 has a low hazard potential and a moderate risk assessment rating. The spillway type is uncontrolled, with a width of 40 feet, and the dam covers a surface area of 13.7 acres. Despite its relatively small size, this dam plays a crucial role in providing fire protection and supporting local wildlife through its stock and small fish pond functions.

With its strategic location and contribution to water resource management in the region, Kolling Dam; Mike 2 stands as a testament to the importance of private infrastructure in safeguarding against emergencies and supporting ecosystem health. Its design and construction by the USFWS reflect a commitment to stewardship and responsible water management practices, making it a noteworthy site for water resource and climate enthusiasts to study and appreciate.