Sulphur Gulch is a privately owned dam located in Payette, Idaho, that serves the primary purpose of irrigation. Constructed in 1976, this earth dam with stone core stands at a height of 22.8 meters and has a hydraulic height of 15.5 meters. With a normal storage capacity of 50 acre-feet and a surface area of 8 acres, Sulphur Gulch plays a crucial role in providing water for agricultural activities in the surrounding area.

Managed by the Idaho Department of Water Resources (IDWR), Sulphur Gulch is regulated, permitted, inspected, and enforced by the state. Despite being classified as a low hazard potential structure, its condition is assessed as fair. The last inspection in June 2019 indicated that the dam's risk assessment is very high, emphasizing the importance of maintaining and managing this vital water resource infrastructure. With a controlled spillway and a maximum discharge capacity of 56 cubic feet per second, Sulphur Gulch ensures efficient water management and flood control for the Sulphur Gulch Creek and Big Willow Creek watersheds.

For water resource and climate enthusiasts, Sulphur Gulch presents an intriguing case study of a privately owned irrigation dam in Idaho. Its construction, design, and operational details offer valuable insights into sustainable water management practices and the importance of regular maintenance and risk assessment for ensuring the safety and efficiency of water infrastructure. As part of the Walla Walla District managed by the US Army Corps of Engineers, Sulphur Gulch plays a significant role in supporting agricultural activities and water supply reliability in the region, highlighting the interconnectedness between water resources, infrastructure, and environmental stewardship.