Upper Pasture is a privately owned dam located in Modoc County, California, near the city of Alturas. It is regulated by the California Department of Water Resources and is used primarily for irrigation and water supply purposes. The dam is classified as an earth dam with a height of 15 feet and a storage capacity of 250 acre-feet.

The dam sits on the Yankee Jim Sl river and has a significant hazard potential, but its condition was assessed as satisfactory as of September 2017. The last inspection took place in October 2020, with a frequency of once per year. The dam's emergency action plan status and risk assessment information are currently unknown, indicating a potential area for improvement in terms of preparedness for any emergencies that may arise.

Upper Pasture plays a crucial role in water resource management in the region, providing water for agricultural irrigation and other uses. Its location in a high-risk area underscores the importance of regular inspections and maintenance to ensure the safety and reliability of the dam for the community it serves.