The Delaware Breakwaters — the first of their kind in the Americas

Written August 2026 · Sources last checked 2 August 2026 · Corrections: hello@lewestown.com

Why build a harbour where there is no harbour

Delaware Bay is a trap in a northeaster. Ships inbound from the Atlantic that could not get up-river had to anchor in open water inside Cape Henlopen, exposed to whatever the weather did next. The cape gives some shelter from the south and east and none at all from the northwest. Vessels were lost at anchor within sight of the town.

The answer was to build shelter that nature had not provided. Work began in 1828 on two stone barriers — one of about 1,700 feet, one of about 2,800 feet — forming what is now Lewes Harbor. They were the first structures of their kind constructed in the Americas, an engineering undertaking of a scale the young republic had not attempted on its coast before.

The stone came from a quarry in New Castle County, at a site that later filled with water and became Bellevue Lake. There is a pleasing symmetry in that: the hole left by building the breakwater is now a lake in a state park, and the breakwater is now a historic district.

Two lights, two jobs

The works are marked by a pair of lighthouses that visitors routinely assume are a matched set. They are not, quite. The Delaware Breakwater East End Light stands on the inner breakwater, close in off Cape Henlopen and the town, and has been showing a light since 1885. The Harbor of Refuge Light stands out on the ocean end of the outer breakwater, in deeper and rougher water.

They were built to work together, marking the National Harbor of Refuge between them — one light telling a mariner where the sheltered water begins, the other where it ends. The Harbor of Refuge Light was originally the Harbor of Refuge West End Light; its east end counterpart was discontinued long ago, which is why the name now looks lopsided.

The outer light has had the harder life. Exposed structures in that position get destroyed and rebuilt; the current tower is not the first attempt at lighting the spot, and the sea has repeatedly had the argument.

What it made possible

A harbour of refuge changed what Lewes was for. The town’s economy already rested on pilotage — the Delaware Bay and River pilots who took deep-draught ships up to Philadelphia and Wilmington lived along Pilottown Road — and sheltered water made that trade both safer and busier. Ships could wait for a pilot, a tide or a change in the weather without risking the anchorage.

The breakwaters were listed on the National Register of Historic Places on 12 December 1976, and are now taken in by the National Harbor of Refuge and Delaware Breakwater Harbor Historic District. From shore they read as a low grey line offshore with a lighthouse at each end; from a boat they are enormous.

From the original page at this address

“For almost a century, mariners inward-bound from Atlantic voyages have been greeted by a pair of lighthouses at the entrance to Delaware Bay. Just off Lewes and within the curve of Cape Henlopen, the East End Light has been beaming illumination to men of the sea since 1885; while in water of greater depth the Harbor of Refuge Light has served the same purpose.”

Hazel D. Brittingham, “The Delaware Bay Breakwaters”, Lewestown Publishers, 1997. © Copyright 1997 Hazel D. Brittingham. Short extract quoted for commentary; the full original is at the Internet Archive.