Allegheny Islands State Park
| Allegheny Islands State Park | |
| Pennsylvania State Park | |
 The eastern part of Allegheny Islands State Park and the C. W. Bill Young Lock and Dam (No. 3) on the Allegheny River
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| Named for: Allegheny River islands | |
| Country | United States |
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| State | Pennsylvania |
| County | Allegheny |
| Township | Harmar |
| Elevation | 735 ft (224.0 m) |
| Coordinates | 40°32′09″N 79°49′44″W / 40.53583°N 79.82889°WCoordinates: 40°32′09″N 79°49′44″W / 40.53583°N 79.82889°W |
| Area | 43 acres (17 ha) |
| Founded | 1980 |
| Management | Pennsylvania Department of Conservation and Natural Resources |
| IUCN category | V - Protected Landscape/Seascape |
 Location of Allegheny Islands State Park in Pennsylvania
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| Website: Allegheny Islands State Park | |
Allegheny Islands State Park is a 43-acre (17 ha) Pennsylvania state park in Harmar Township, Allegheny County, Pennsylvania in the United States. The undeveloped park is composed of three alluvial islands located in the middle of the Allegheny River northeast of Pittsburgh. The islands are just north of the boroughs of Oakmont and Plum, and southwest of Cheswick. Bridges for the Pennsylvania Turnpike (Interstate 76) and the Bessemer and Lake Erie Railroad Branch of the Canadian National Railway cross the Allegheny River at the middle island.
The park land on the islands has a total area of 43 acres (17 ha), with two islands downstream of the Allegheny River Lock and Dam Three (officially named the C. W. Bill Young Lock and Dam), and the other island upstream. Twelve Mile Island is the furthest downstream (west) and has a number of houses and buildings on the western four-fifths of the island (the park land is the eastern end). The remaining two islands are both uninhabited and have no structures on them. They were originally one island named Fourteen Mile Island, but were split into two parts by the construction of the dam. Today the name Fourteen Mile Island is given to the middle island, just downstream (west) of the dam, and it is the site of the highway and railroad bridges. According to the USGS GNIS, the last island (which was once part of Fourteen Mile Island) is unnamed (although it is still labeled "Fourteen Mile Island" on the U.S. Army Corps of Engineers navigation maps of the Allegheny River.) This unnamed island is the easternmost and the only one upstream of the dam. There are also five to seven shoals near the islands, which are occasionally exposed.
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