Thomas-Cavender is a privately owned earth dam located in Grant County, Oregon, specifically in the city of Monument. Completed in 1985, this irrigation dam stands at a height of 32 feet and has a hydraulic height of 29 feet. It serves the primary purpose of irrigation and has a storage capacity of 175 acre-feet, with a surface area of 2.82 acres and a drainage area of 167 square miles.

The dam is situated on Pine Hollow Creek, an offstream water source, and is regulated by the Oregon Water Resources Department. With a low hazard potential and a condition assessment of "Not Rated," Thomas-Cavender has not undergone any recent modifications. The dam's outlet gates consist of slide (sluice gate) mechanisms, and it has a maximum discharge capacity of 40 cubic feet per second.

Although last inspected in 2014, the dam's inspection frequency is set at every three years. It is important to note that Thomas-Cavender does not fall under the jurisdiction of the U.S. Army Corps of Engineers and has not had an emergency action plan prepared or updated. Overall, this structure plays a crucial role in supporting agricultural activities in the region while maintaining a low risk profile.