Somerville, The Reservoir, also known as Little Grassy Reservoir, is a privately owned water resource located in Rome, Malheur County, Oregon. Built in 1912, this earth dam stands at 30 feet high and spans 250 feet in length, with a storage capacity of 2000 acre-feet and a surface area of 334 acres. The reservoir primarily serves the purpose of irrigation, drawing water from Spring Creek for agricultural use in the region.

Managed by the Oregon Water Resources Department, Somerville Reservoir has a low hazard potential and has not been rated for its condition assessment. With a maximum discharge capacity of 900 cubic feet per second, this reservoir plays a crucial role in supporting the local farming community. The outlet gates are of the needle type, and the last inspection was conducted in October 2020, with a frequency of inspections every 6 years. While the risk assessment and emergency preparedness aspects are not fully detailed, the reservoir remains a vital water source in the area for agricultural sustainability and climate resilience.