Anderson Dam 809 is a privately owned earth dam located in Valentine, Nebraska, along the TR-NIOBRARA RIVER. Built in 1950 by the USDA NRCS, this dam primarily serves the purpose of irrigation, with a storage capacity of 373 acre-feet and a drainage area of 21.4 square miles. The dam stands at a height of 33 feet and spans a length of 700 feet, making it a crucial water resource infrastructure in the region.

Managed by the Nebraska Department of Natural Resources, Anderson Dam 809 has a low hazard potential and is currently rated as 'Not Rated' in terms of its condition assessment. The dam undergoes regular inspections every five years, with the last inspection conducted in September 2019. Although the dam has not been modified in recent years, it remains a key component of the local water management system, ensuring water availability for irrigation purposes while mitigating flood risks in the area. With its strategic location and design, Anderson Dam 809 plays a vital role in sustaining water resources and supporting agricultural activities in Dawes County, Nebraska.