Information server for southern Guam natural resources
Umatac watershed is located in the southwest coast of Guam, in the north of Merizo and the south of Agat. It has a drainage area of 3.84 square miles. The main rivers in the watershed include La Sa Fua River, Laelae River, Madog River, Chagame River and Astaban River with approximate lengths of 2.11 miles, 1.9 miles, 1.59 miles, 1.02 miles and 0.2 mile respectively. Chagame River flows from north to south, and merges to La Sa Fua River which discharges to Fouha Bay in the Philippine Sea. Astaban River discharges to Madog River, which merges to Umatac River. Laelae River drains from east to west to Umatac River. Umatac River discharges to Umatac Bay. The highest elevation is about 1243 feet (379 meters) in the eastern boundary of the watershed. The vegetated area is about 97.4%, and urban area is about 2%. The soil types mainly include Ylig clay, Akina-Atate silty clays, Togcha-Akina silty clays, Akina-Badland complex, Inarajan clay, rock and urban land complex.
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