Lyman Reservoir, Reservoir in Apache County, eastern Arizona, United States

Lyman Reservoir is a 1,400-acre irrigation impoundment on the Little Colorado River, 17 miles north of Springerville in eastern Arizona. It sits at 5,980 feet within Lyman Lake State Park, surrounded by Mount Baldy and Escudilla Mountain. When full, it averages 22 feet deep with a maximum of 57 feet, holding largemouth bass, channel catfish, crappie, carp and a few walleye.

Lyman Reservoir was created in 1915 when the Little Colorado River was dammed for irrigation. Lyman Lake State Park was officially dedicated on July 1, 1961, making it Arizona's first recreational state park. The lake lies entirely within the park and is fed by runoff from Mount Baldy and Escudilla Mountain.

The reservoir takes its name from the Lyman family, early settlers of the Little Colorado valley. Since 1961 it has drawn anglers, campers and water skiers, and the west shore is reserved for fishermen pursuing walleye, catfish and bass. The Peninsula Petroglyph Trail at the west end passes more than 200 carvings left by Ancestral Pueblo people and later inhabitants.

The lake sits about 17 miles north of Springerville at an elevation of nearly 6,000 feet. The park offers 56 campsites, parking areas, walking trails, and shaded spaces, with boats of any size permitted and an on-site store providing supplies and equipment rentals.

The lake is unusual for having no speed restrictions on motorboats, making it a destination for water sports in the area. The Peninsula Petroglyph Trail near the west end features over 200 ancient carvings left by Ancestral Pueblo people and the region's early inhabitants.