Den Hoed Dam No 1 is a privately-owned structure located in Sunnyside, Washington, along Sulphur Creek. Completed in 1999, this earth dam serves primarily for irrigation purposes, with a hydraulic height of 15 feet and a structural height of 15 feet. The dam has a storage capacity of 23 acre-feet and covers a surface area of 2.5 acres, with a drainage area of 17.9 square miles.

Despite its importance for irrigation, Den Hoed Dam No 1 presents some concerning aspects. Classified with a high hazard potential and poor condition assessment, the dam last underwent inspection in October 2015. The Washington Department of Ecology regulates the dam, overseeing its permitting, inspection, and enforcement. With its location in Yakima County and proximity to the Seattle District, the dam plays a crucial role in managing water resources in the region.

For water resource and climate enthusiasts, Den Hoed Dam No 1 represents a significant piece of infrastructure in the state of Washington. As a key component in the local irrigation system, the dam's condition and maintenance are essential for ensuring water supply reliability and mitigating potential risks. With its association with Sulphur Creek and its role in serving agricultural needs, Den Hoed Dam No 1 underscores the intricate relationship between water resources, infrastructure, and environmental stewardship in the Pacific Northwest.