JavaScript Required

JavaScript is required to use content on this page. Please enable JavaScript in your browser.

NOTICE: Weekend and holiday reservations required at Sandy Point State Park and Greenbrier State Park starting Saturday, May 24.

Reservations can be made starting seven days in advance of a visit.

Algal Identification

Phytoplankton Home

Harmful Algal Blooms

Harmful Algal Blooms in Maryland

Procentium Minimum Distribution

Distribution Map