Fort Delaware State Park

By America's State Parks Editorial TeamMay 9, 2026 · Updated May 10, 2026

🏆 Island Fortress — Civil War-era island fortress in the Delaware River — Fort Delaware held up to 12,500 Confederate prisoners of war, making it one of the largest POW camps in the North! The granite and brick pentagonal fort on Pea Patch Island is accessible only by ferry. Legend says the island formed when a boat carrying peas sank, and the peas sprouted to create the island!

Visitor Information

Getting There

Accessible only by ferry from Delaware City (March-November). The boat ride across the Delaware River is part of the experience. Fort Delaware sits on Pea Patch Island — named, legend says, because a colonial ship carrying peas ran aground and the peas grew on the island. Combination tickets with Fort DuPont are available. Ghost tours are offered in October — with 2,700+ deaths, spirits supposedly abound.

Plan Your Visit

Fort Delaware is accessible only by ferry from Delaware City (March-November, $12 adults). The massive granite-and-brick fort is one of the best-preserved Civil War fortifications on the East Coast. Living history programs feature uniformed interpreters portraying guards and prisoners. Ghost tours are offered in October. Combine with Fort DuPont State Park (adjacent in Delaware City) for a full Civil War heritage day. Pea Patch Island also hosts a great blue heron rookery.

Nature & Wildlife

Pea Patch Island hosts one of the largest wading bird rookeries on the East Coast — great blue herons, cattle egrets, black-crowned night herons, and glossy ibis nest in the island’s woodland canopy. Over 10,000 pairs of herons breed here annually. The rookery is protected and not accessible to visitors, but birds are easily observed from the fort’s ramparts. Horseshoe crabs spawn on the island’s beaches each May.

Insider Tips

Civil War prison: Fort Delaware on Pea Patch Island held up to 12,500 Confederate prisoners — conditions were so harsh it was called the “Andersonville of the North.” Pro tip: An estimated 2,460 prisoners died here. Island fortress: The massive granite fort was built 1848-1868 to defend the Delaware River approaches to Philadelphia and Wilmington.

Frequently Asked Questions

How bad were Civil War prisons?

Civil War prisons on both sides were horrific — Andersonville (Confederate) and Fort Delaware (Union) had mortality rates of 20-30%. Overcrowding, disease, starvation, and exposure killed thousands. Approximately 56,000 soldiers died in captivity during the war — roughly 10% of all deaths. The breakdown of prisoner exchanges in 1863 (over the treatment of Black soldiers) worsened conditions dramatically. Both sides used prison conditions as propaganda.

More parks nearby: Fort DuPont State Park and Lums Pond State Park are both a short drive away.

About the Author

America's State Parks Editorial Team

America's State Parks is an independent online guide to state parks and other public lands in the United States. Our editorial team compiles park profiles from official agency and operator sources and other identified references, and follows our published editorial policy and review methodology. Where a profile shows a source-check date, that date applies to the detail it names. We correct errors when we find them or when readers report them.

View All Articles by America's State Parks Editorial Team →