Bliss No. 1 is a privately owned irrigation dam located in Lance Creek, Wyoming, on Bills Creek. Built in 1970, this Earth-type dam stands at 33 feet tall and has a storage capacity of 428 acre-feet. Despite its age, the dam has a low hazard potential but is in poor condition according to a 2018 assessment. It features a slide (sluice gate) outlet gate and an uncontrolled spillway that is 75 feet wide.

The dam is inspected every 5 years, with the last assessment conducted in June 2018. While it is state-regulated and permitted, its condition is flagged as poor, indicating a need for maintenance and potential improvements to ensure its long-term safety and effectiveness. With a moderate risk assessment score of 3, there may be room for enhanced risk management measures to address any potential vulnerabilities and ensure the continued functionality of Bliss No. 1 for irrigation purposes in the future.