Larson, also known as Larson #1, is a privately owned dam located in Rio Blanco, Colorado. Completed in 1888, this Earth-type dam stands at a height of 21 feet and has a length of 66 feet. The primary purpose of Larson Dam is for water supply, serving irrigation and other water supply needs in the area. With a storage capacity of 74 acre-feet and a normal storage of 62 acre-feet, Larson Dam plays a crucial role in water management in the region.

Managed by the Colorado Division of Water Resources (DWR), Larson Dam is regulated, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. The dam has a low hazard potential and is rated in fair condition, with a moderate risk assessment score of 3. Although there are no associated structures with Larson Dam, it is equipped with an uncontrolled spillway and has a maximum discharge capacity of 273 cubic feet per second. Overall, Larson Dam remains an essential water resource infrastructure in Colorado, contributing to water supply and irrigation needs in the area.

With its historical significance dating back to the late 19th century, Larson Dam continues to play a vital role in water management and supply in Rio Blanco County. As a key feature of the Piceance CR-TR river system, Larson Dam provides essential water storage and control capabilities, ensuring a reliable water supply for agricultural and other uses in the region. Despite its age, Larson Dam remains a functional and important component of Colorado's water infrastructure, highlighting the importance of maintaining and monitoring such critical water resources in the face of climate challenges and water scarcity concerns.