Matagorda Island (i//), Spanish for "thick brush," is a 38 mile (61 km) long barrier island on the Texas Gulf coast, located approximately seven miles south of Port O'Connor, in the southernmost part of Matagorda County. Traditional homeland of the Karankawa Indians. The island is oriented generally northeast-southwest, with the Gulf of Mexico on the east and south, and Espiritu Santo Bay on the west and north. It is separated from San José Island to the south by Cedar Bayou, and is separated from the Matagorda Peninsula to the north by Pass Cavallo. It has no permanent residents and is accessible by boat only. It has a land area of 157.25 km² (60.7 sq mi).
Matagorda Island State Park occupies 7325 acres (29.64 km²) on the northeastern end of the island. The remainder of the island is devoted to wildlife refuges managed by the Texas Parks and Wildlife Department and the United States Fish and Wildlife Service and is known as Matagorda Island National Wildlife Refuge and State Natural Area.
The land that is now Matagorda Island State park was acquired in 1940 by condemnation from the Hawes, Hill, and Little families (but not the Wynne-Murchison interests) for use as a temporary training facility for the WWII era.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Matagorda Island has a humid subtropical climate, abbreviated "Cfa" on climate maps.
- Matagorda Island: Block 2201, Census Tract 9905, Calhoun County, Texas United States Census Bureau
- 2004 Rand McNally Atlas
- Texas Parks and Wildlife: Matagorda Island State Park
- Aransas National Wildlife Refuge Complex: Matagorda Island Unit
- The short film Aransas and Matagorda Island National Wildlife Refuges (2005) is available for free download at the Internet Archive
- Matagorda Island History
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