Shiner Upper, also known as Ellsworth Upper, is a private dam located in Lemhi, Idaho, along Yearian Creek and the Lemhi River. Built in 1968 for irrigation purposes, this earth dam with stone core stands at a height of 29.2 feet and has a storage capacity of 250 acre-feet. With a drainage area of 4.5 square miles and a spillway width of 10 feet, Shiner Upper plays a crucial role in managing water resources in the region.

Managed by the Idaho Department of Water Resources, Shiner Upper is subject to state regulations, inspections, and enforcement measures to ensure its safety and functionality. Despite being rated as having a significant hazard potential, the dam is currently assessed to be in fair condition. However, considering the very high risk associated with the structure, there is a need for ongoing risk management measures to mitigate any potential threats and protect the surrounding community. Water resource and climate enthusiasts will find Shiner Upper to be a fascinating example of infrastructure that plays a vital role in water management in the area.