Niegel is a private water supply dam located in Lotus, California, on the scenic Hastings Creek. Built in 1951, this earth dam stands at a height of 63 feet and has a storage capacity of 99 acre-feet. With a primary purpose of water supply, it also serves for irrigation and recreation purposes, reflecting the multi-functional role of dams in water resource management.

Managed by the California Department of Water Resources, Niegel is subject to state regulations for safety and inspection. Its condition assessment in 2017 was deemed satisfactory, but its significant hazard potential underscores the importance of regular monitoring and maintenance. With a last inspection date in February 2020, the dam meets guidelines for emergency action plans, yet further risk assessment measures are not specified.

Located within El Dorado County, Niegel is under the jurisdiction of the San Francisco District of the US Army Corps of Engineers. Its strategic position and role in water management make it a notable structure for enthusiasts of water resources and climate, highlighting the intricate balance between human development and environmental stewardship in the region.