Shaw Twins Upper is a private irrigation dam located in Valley, Idaho, along the unnamed stream of Lake Fork Creek. Built in 1930, this concrete dam stands at a height of 17 feet and has a storage capacity of 188 acre-feet. With a fair condition assessment and low hazard potential, Shaw Twins Upper plays a crucial role in providing water resources for agricultural purposes in the region.

Despite its modest size, the dam is regulated by the Idaho Department of Water Resources, ensuring that it meets state inspection and enforcement standards. The dam features an uncontrolled spillway and slide gates for water release, with a maximum discharge capacity of 48 cubic feet per second. The surrounding area covers 20 acres, serving a drainage area of 0.1 square miles and contributing to the overall water management system in the region.

Overall, Shaw Twins Upper serves as a reliable infrastructure for irrigation purposes in Valley, Idaho, maintaining a moderate risk assessment level. With a history dating back to the early 20th century, this dam continues to support the local agricultural community while adhering to state regulations and inspection protocols to ensure its safe and efficient operation in the face of changing climate conditions.