Donner Euer Valley is a privately owned dam located in Hobart Mills, California, along the Tr Sfk Prosser Creek. Constructed in 1966, this earth dam stands at a height of 21 feet and has a storage capacity of 80 acre-feet, primarily used for water supply. The dam also serves recreational purposes and covers a surface area of 16 acres, with a drainage area of 1.1 square miles.

Managed by the Natural Resources Conservation Service, Donner Euer Valley has a low hazard potential and is in satisfactory condition based on the last assessment conducted in September 2017. Despite its age, the dam undergoes regular inspections and meets state regulations for safety and maintenance. The dam's emergency action plan status, risk assessments, and flood inundation maps are currently unreported, suggesting a potential area for improvement in emergency preparedness and risk management protocols.

Located in Nevada County, California, Donner Euer Valley is situated within the San Francisco District and falls under the jurisdiction of the Department of Water Resources for dam safety. Its strategic location and historical significance in water resource management make it a notable structure for water resource and climate enthusiasts interested in understanding the role of dams in water supply and recreational activities in the region.