Blue No. 1 is a privately owned earth dam located in Sweetwater, Wyoming, along the Battle Spring river. Completed in 1997, this dam stands at a height of 50 feet and has a hydraulic height of 45 feet. With a length of 6800 feet and a surface area of 58 acres, Blue No. 1 serves a primary purpose as an "Other" structure, with a low hazard potential and fair condition assessment.

Despite being privately owned, Blue No. 1 is state-regulated and has undergone inspections to ensure its safety and compliance with regulatory standards. With a spillway width of 20 feet and no outlet gates, this dam poses a moderate risk according to a risk assessment conducted recently. Its condition assessment in 2020 deemed it to be in fair condition, with a relatively low hazard potential.

Water resource and climate enthusiasts can appreciate the importance of structures like Blue No. 1 in managing water resources and controlling potential risks associated with dams. As a key part of the water infrastructure in Wyoming, Blue No. 1 plays a crucial role in maintaining water storage and regulating the flow of the Battle Spring river. Its moderately assessed risk level underscores the need for ongoing monitoring and maintenance to ensure the safety and effectiveness of this vital structure for the community and the environment.