Parkman Disposal is a private earth dam located on Parkman Draw in Johnson, Wyoming. Built in 1985 by designer Franklin R. Muth, this structure serves primarily for debris control. Standing at a height of 60 feet with a hydraulic height of 57 feet, the dam spans a length of 940 feet and has a storage capacity of 203 acre-feet. Despite its low hazard potential and fair condition assessment, the risk assessment for Parkman Disposal is considered high, indicating the need for ongoing monitoring and management measures.

This dam, constructed for the purpose of debris control, plays a crucial role in managing the flow of Parkman Draw. With no spillway and other controlled outlet gates, Parkman Disposal has been regulated and inspected by the State of Wyoming, demonstrating a commitment to ensuring its safety and functionality. The surrounding area benefits from the dam's presence, as it helps mitigate the risk of flooding and potential environmental impacts. As a key piece of infrastructure in the region, Parkman Disposal serves as a testament to the importance of water resource management in maintaining a sustainable and resilient environment.

Despite its relatively low hazard potential, Parkman Disposal poses a high risk due to its location and the potential consequences of failure. With a history of regular inspections and maintenance, the dam remains in fair condition as of the last assessment in May 2021. Continued monitoring and adherence to safety guidelines are essential to mitigate the identified risks and ensure the long-term integrity of this critical water resource infrastructure in Wyoming.