Upper Clark Reservoir, also known as Clark Reservoir 2, is a Federal-owned water supply reservoir located in Malheur, Oregon. Managed by the Bureau of Land Management, this gravity dam was completed in 2004 and has a maximum storage capacity of 280 acre-feet. With a normal storage level of 61.9 acre-feet, the reservoir covers a surface area of 56 acres and serves as a vital water source in the region.

Situated in the Walla Walla District, Upper Clark Reservoir plays a crucial role in water supply for the area. The dam stands at a height of 12 feet and has a structural length of 240 feet. Although its hazard potential is rated as low and its condition is not currently assessed, the reservoir undergoes inspections every five years to ensure its safety and functionality. With no spillway and a lack of associated structures, the focus remains on its primary purpose of water supply.

This picturesque reservoir, nestled in the Oregon landscape, offers a glimpse into the intricate infrastructure that supports water resource management in the region. As a gravity dam constructed with buttress and stone core types, Upper Clark Reservoir exemplifies the dedication of the Bureau of Land Management in providing a sustainable water supply for the surrounding communities. The reservoir's strategic location and ample storage capacity make it a valuable asset in the ongoing efforts to balance water resource utilization and conservation in the area.