Scarlett Lake, located in Lyman State Park in Apache County, Arizona, is a private irrigation reservoir with a low hazard potential. Built in 1950, the earth dam stands at 8.5 feet high and spans 1013 feet, with a storage capacity of 212 acre-feet. The lake serves multiple purposes including irrigation, fire protection, stock watering, and small fish pond maintenance.

Managed by the Arizona Department of Water Resources, Scarlett Lake is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and integrity. The spillway of the lake is uncontrolled with a width of 49 feet. The surrounding area covers 74.7 acres and is fed by Coyote Creek, making it a vital water resource for the region. Despite being classified as a moderate risk structure, the lake has not been rated for its condition, but has a scheduled inspection frequency of 5 years.

With its picturesque location and vital role in supporting irrigation and wildlife, Scarlett Lake stands as a testament to sustainable water management practices in Arizona. Water resource and climate enthusiasts can appreciate the efforts put into maintaining this reservoir for the benefit of the local community and ecosystem.