Information server for southern Guam natural resources

Apra watershed

Apra watershed is located in the southern coast in the middle of Guam, including Apra Harbor. It has a drainage area of 13.65 sq. miles. The main rivers in the watershed include Atantano River, Sasa River, Aguada River, Big Guatali River, Aplacho River, Maggo River, Guatali River, Laghas River, Tenjo River and Paulana River with approximate lengths of 2.65 miles, 2.48 miles, 2.42 miles, 2.42 miles, 2.32 miles, 2.17 miles, 1.36 miles, 1.18 miles, 1.15 miles and 0.93 mile respectively. These rivers discharge to Apra Harbor from east to west. The highest elevation is about 1047 feet (319 meters) in the east of the northern part of the watershed. About 62.7% and 33.8% of the watershed is covered by forest and developed areas respectively. The soil types include Ylig clay, Akina silty clays, Pulantat caly, Inarajan clay, Inarajan variant mucky clay, badland, Agfayan clay, Shioya loamy sand, rock, and urban land complex.

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