Clark #1 is a privately owned dam located in Huerfano County, Colorado, specifically in the city of Boone. Completed in 1904, this Earth-type dam serves primarily for irrigation purposes, with a storage capacity of 277 acre-feet and a normal storage of 220 acre-feet. The dam is situated on Apache Creek-OS and has a length of 2340 feet, a height of 22 feet, and a hydraulic height of 22 feet.

Even though the hazard potential of Clark #1 is rated as low, it has a high risk assessment level (2). The dam does not have a spillway but features a spillway width of 200 feet. While the condition assessment is not rated and the last inspection took place in December 2000, the dam is regulated by the Colorado Division of Water Resources, with state permitting, inspection, and enforcement all in place.

For water resource and climate enthusiasts, Clark #1 presents an interesting case study of an early 20th-century irrigation dam in Colorado. Its historical significance, design features, and regulatory framework offer valuable insights into the management of water resources in the region. Despite its low hazard potential, the high risk assessment underscores the importance of ongoing monitoring and maintenance to ensure the safety and effectiveness of this essential infrastructure.