Hart-Miller Island State Park
🏆🏆🏆🏆🏆 Maryland — Man-made island in the Chesapeake Bay — built from Baltimore Harbor dredge material! Hart and Miller were two separate islands until the Army Corps connected them with a dike in 1981. Now a 1,100-acre wildlife sanctuary accessible only by boat, with nesting bald eagles and pristine beaches!
Visitor Information
| Detail | Info |
|---|---|
| Location | Maryland |
About Hart-Miller Island
Hart-Miller Island State Park in Baltimore County is a 1,100-acre island in the upper Chesapeake Bay accessible only by boat. The island was created by combining Hart and Miller Islands with dredged material from Baltimore Harbor shipping channels. What began as an industrial dredge disposal site has been reclaimed as a wildlife haven and recreation area — one of Maryland’s most remarkable environmental transformations.
Things to Do
Boating to the island, beach swimming, camping, fishing, birdwatching (the island supports heron rookeries and shorebird nesting), kayaking, and witnessing the transformation from dredge disposal site to nature preserve.
History & Ecology
The island’s transformation from dredge disposal to wildlife habitat is one of the Chesapeake Bay’s great environmental success stories. Dredged material, once considered waste, was strategically placed to create wetland habitat. The island now supports nesting colonies of least terns and black skimmers — both declining species. Access requires a private boat from Middle River or Essex marinas (3-mile crossing).
Plan Your Visit
Access requires a private boat — launch from Rocky Point or Weaver Cove marinas (3-mile crossing). Primitive camping is available (permit required). The 1,100-acre island has 8 miles of trails, sandy beaches, and a fishing pier. Bring all water and supplies — no concessions on the island. The transformation from dredge site to nature preserve took 30 years and is considered a national model. Best visited May through October.
Insider Tips
Man-made island: Hart-Miller Island was created from dredge material — Baltimore Harbor sediment built up over decades to form a 1,100-acre island. Pro tip: The island is boat-access only — creating a secluded beach experience just miles from Baltimore. Baltimore Harbor: The harbor’s constant dredging keeps shipping channels open for one of America’s busiest ports.
Best Time to Visit
Summer: Beach and swimming — boat access. Fall: Quiet birding. Spring: Shorebird migration. Winter: Closed to visitors.
Frequently Asked Questions
How was the island made?
Hart-Miller Island was created by enclosing a 1,100-acre area with dikes and filling it with dredged material from Baltimore Harbor shipping channels. The process took decades (1981-2009). Once the dredging was complete, the island was capped with clean soil and opened as a state park — beaches, trails, and wildlife habitat emerged from harbor sludge. It’s a remarkable example of turning industrial waste into public recreation.
