Algonac State Park

Algonac State Park
Location within the state of Michigan
Location	Clay Township St. Clair County, Michigan
Nearest city	Algonac, Michigan
Coordinates	42°38′40″N 82°31′26″W / 42.64444°N 82.52389°W / 42.64444; -82.52389Coordinates: 42°38′40″N 82°31′26″W / 42.64444°N 82.52389°W / 42.64444; -82.52389
Area	2.27 mi² (5.90 km²)
Governing body	Michigan Department of Natural Resources
Website	Official website

Algonac State Park is a 1,450-acre (5.9 km²) state park in St. Clair County, Michigan. The park has approximately a half mile (800 m) of St. Clair River frontage, making viewing of international freighters a major attraction.

Approximately 83% of the park's area is undeveloped. This undeveloped portion of the park encompasses significant lakeplain prairie and oak openings (savannas), which have been described as unique natural environments in Michigan. The park is home to at least 22 plant and animal species classified as endangered, threatened, or special concern .