Thompson is a privately owned irrigation dam located in Niobrara, Wyoming, along the Cody Draw river. Constructed in 1950, this earth dam stands at a height of 37 feet and has a storage capacity of 173 acre-feet. With a spillway width of 25 feet and an uncontrolled spillway type, Thompson has been classified as having low hazard potential and fair condition.

Managed by the Wyoming State Engineer's Office, Thompson undergoes regular inspections with a frequency of 5 years to ensure its structural integrity and safety. The dam is equipped with a single valve outlet gate and serves the primary purpose of irrigation in the surrounding area. Despite its moderate risk assessment rating, Thompson provides vital water resources for agricultural activities in the region, underscoring its importance in sustaining the local ecosystem and economy.