Twin Lake-Upper, also known as Upper Pine Lake, is a private water resource located in Baker, Oregon. This concrete dam, completed in 1908, serves primarily for irrigation purposes with a storage capacity of 150 acre-feet. The dam stands at a height of 15 feet with a structural height of 15 feet, providing a surface area of 16.7 acres and a drainage area of 0.5 square miles.

Managed by the Oregon Water Resources Department, Twin Lake-Upper is regulated, permitted, inspected, and enforced by the state, ensuring its safety and compliance with regulations. The dam has a low hazard potential and is currently rated as 'Not Rated' in terms of condition assessment. With a maximum discharge of 51 cubic feet per second, the dam is situated on the West Fork Pine Creek in a picturesque location near the city of CORNUCOPIA, offering a vital water source for agriculture and environmental conservation efforts in the region.

Despite its age, Twin Lake-Upper continues to play a crucial role in water management and irrigation in the area, showcasing the importance of maintaining and monitoring these vital water resources for the future. With regular inspections and state oversight in place, this historic dam stands as a testament to the enduring legacy of water resource management in Oregon and the dedication to safeguarding our precious natural resources for generations to come.