Little Montes, also known as Ottosen Reservoir, is a private water storage facility located in Uintah, Utah. Managed by the USDA NRCS, this reservoir serves primarily for irrigation purposes and was completed in 1963. With a storage capacity of 95 acre-feet and a normal storage level of 94.67 acre-feet, it plays a crucial role in supporting agricultural activities in the area.

Situated along Montes Hollow, this earth dam structure stands at a hydraulic height of 16 feet and a structural height of 21 feet. Despite being classified as having a low hazard potential, the dam is regulated, inspected, and enforced by the Utah Division of Water Rights to ensure its safety and compliance with state regulations. The last inspection in March 2018 showed no significant concerns, and the reservoir continues to provide vital water resources for the surrounding community.

Located within the jurisdiction of the state of Utah, Ottosen Reservoir is a key asset for water management in the region. With its strategic location and design, this reservoir not only supports irrigation needs but also contributes to the overall water resource management efforts in Uintah County. As climate change impacts water availability, reservoirs like Little Montes play a crucial role in ensuring sustainable water supply for agricultural activities and ecosystems alike.