Howell is a privately-owned earth dam located in Imbler, Oregon, along the Grande Ronde River's old channel. Completed in 1980, the dam stands at a height of 15 feet and has a storage capacity of 85 acre-feet, primarily used for irrigation purposes. The dam has a low hazard potential and has not been rated for its condition, with the last inspection conducted in July 2011. The outlet gates consist of a slide (sluice gate), and the dam is regulated and inspected by the Oregon Water Resources Department.

The Howell dam plays a crucial role in managing water resources in Union County, Oregon, serving as a vital irrigation structure for the surrounding agricultural lands. With a structural height of 18 feet and a length of 630 feet, the dam helps regulate water flow and storage along the Grande Ronde River. While its hazard potential is low, regular inspections and maintenance are essential to ensure the dam's continued safety and functionality. The dam's location within the Portland District underscores its significance in water resource management in the region.

As a key component of the irrigation infrastructure in Union County, the Howell dam contributes to the sustainable use of water resources for agricultural purposes. Its presence highlights the importance of proper dam maintenance and inspection to ensure the safety of surrounding communities and the efficiency of water distribution for irrigation. With its earth construction and slide gate outlet, the Howell dam stands as a testament to the careful balance of water resource management and climate resilience in the region.