Jaca Dam, also known as Upper Anderson, is a privately-owned structure located in Malheur, Oregon, along Crooked Creek. This earth dam serves primarily for irrigation purposes, with a height of 34 feet and a storage capacity of 3400 acre-feet. While the dam has a low hazard potential and is currently not rated for its condition, it is regulated and inspected by the Oregon Water Resources Department to ensure its safety and compliance with state regulations.

Situated in a scenic area within the Walla Walla District, Jaca Dam plays a crucial role in water resource management, providing vital irrigation water for agricultural activities in the region. The dam features a needle outlet gate and has not been modified since its completion, reflecting its reliability in fulfilling its intended purpose. Although it does not have a spillway or associated locks, the dam's design and construction by LUPER have withstood the test of time.

With its strategic location and importance for water supply, Jaca Dam represents a significant asset for the local community and the broader ecosystem. While it may not have undergone recent condition assessments or emergency action plan updates, the dam's operational history and low hazard potential speak to its stable performance in serving the irrigation needs of the area. As water resource and climate enthusiasts, the unique characteristics and regulatory oversight of Jaca Dam make it a compelling structure to study and appreciate within the context of sustainable water management practices.