Lost Creek #1, located in Weld County, Colorado, is a privately owned earth dam completed in 1908 primarily for fire protection, stock, and small fish pond purposes. With a dam height of 9 feet and a length of 1829 feet, this reservoir has a storage capacity of 201 acre-feet and a surface area of 48 acres. The dam is situated on the Lost Creek river and is regulated by the Colorado Department of Water Resources, with state jurisdiction, permitting, inspection, and enforcement in place to ensure its safety and compliance.

Despite being categorized as low hazard potential, Lost Creek #1 poses a high risk due to its age and lack of recent condition assessment. The last inspection conducted was in 1985, highlighting the need for regular monitoring and maintenance to mitigate any potential risks. While the dam does not have a spillway, it has a maximum discharge capacity of 5530 cubic feet per second, emphasizing the importance of proper management to prevent overtopping during extreme events.

Enthusiasts of water resources and climate will find Lost Creek #1 a fascinating case study for understanding the history, design, and management of a century-old dam in Colorado. With its unique combination of purposes and its location on Lost Creek, this dam serves as a valuable asset for fire protection and agricultural activities in the region. However, the high risk associated with its condition warrants attention and proactive measures to ensure its long-term stability and safety for both the environment and surrounding communities.