Newland No. 4, located in Crook, Wyoming, is a privately owned earth dam completed in 1955 with a primary purpose of fire protection, stock, or small fish pond. This dam on Cow Creek has a height of 21 feet and a storage capacity of 133 acre-feet, with a normal storage level of 53 acre-feet. Despite its low hazard potential, the dam is currently in poor condition and was last inspected in August 2021, with an inspection frequency of 5 years.

The dam features an uncontrolled spillway with a width of 60 feet, and its risk assessment indicates a moderate risk level. The structure is regulated by the Wyoming State Engineer's Office, with permitting, inspection, and enforcement all carried out by state authorities. The surrounding area has a surface area of 12 acres and no drainage area, making it crucial for local fire protection and stock water supply. With its proximity to Belle Fourche, SD, and its critical functions, Newland No. 4 serves as an important water resource for the region, despite its current maintenance challenges.