Tonkin Reservoir Dam, located in Eureka, Nevada, is a private-owned dam constructed in 2016 with a primary purpose of irrigation. The dam stands at a height of 18 feet and has a hydraulic height of 15 feet, with a storage capacity of 50 acre-feet. It spans 710 feet in length and is primarily made of earth and stone materials, resting on a soil foundation.

The dam is regulated and inspected by the Nevada Department of Water Resources, with a low hazard potential and fair condition assessment as of the last inspection in April 2020. The reservoir is fed by Denay Creek and serves multiple purposes including fire protection, stock watering, and small fish pond in addition to irrigation. The spillway type is uncontrolled with a width of 16 feet, and the outlet gates consist of a slide (sluice gate).

With its moderate risk assessment and moderate drainage area of 18 acres, Tonkin Reservoir Dam plays a crucial role in water resource management in the region. Despite its low hazard potential, the dam remains a vital infrastructure for supporting agricultural activities and ensuring water availability for various uses. Climate and water resource enthusiasts will appreciate the engineering details and operational aspects of this essential structure in Nevada.