Markham is a local government-owned dam located in Cody, Wyoming, along the South Fork Shoshone Offstream. Built in 1929 by designer Howard F. Bell, this Earth-type dam stands at a height of 11 feet and spans 2500 feet in length. With a primary purpose of water supply for irrigation and other uses, Markham has a storage capacity of 730 acre-feet and a normal storage level of 67 acre-feet.

Despite its fair condition assessment and significant hazard potential, Markham is regulated and inspected by the State Regulatory Agency (SEO) in Wyoming. The dam has an uncontrolled spillway system with a width of 20 feet and is equipped with one other controlled outlet gate for water release. The dam's emergency action plan (EAP) was last revised in 2012, and it meets moderate risk assessments, indicating a need for ongoing risk management measures to ensure public safety and water resource protection in the region.

For water resource and climate enthusiasts, Markham serves as a vital infrastructure for water supply and irrigation in Park County, Wyoming. With its historical significance and ongoing regulatory oversight, this dam represents a key component of the local water management system. As climate change impacts continue to influence water availability and infrastructure resilience, ongoing monitoring and maintenance efforts at Markham are essential to safeguarding this important resource for the community and surrounding areas.