The Port Mahon Lighthouse was built in 1903. The landmark burned down in 1984; the pilings are all that remain today. In the past, this road was lined with fishing shacks, docks, oyster shucking houses, and some residences. At one time there was also a migrant camp for workers. All of these buildings have long since eroded into the bay.

The pipeline that you see along the road is the main jet fuel supply line for Dover Air Force Base. This fuel is brought in by tankers. There is a public boat launch at the end of this road. This is a good spot for fishing and observing shorebird migration.

Port Mahon is perhaps one of the most graphic demonstrations of beach erosion in recent Delaware history. The lighthouse originally stood more than 200 feet inland, but today, the pilings stand in water. The state of Delaware has spent considerable time and effort trying to fend off the inevitable, but Mother Nature is clearly winning the battle. The dirt portion of the road is subject to seasonal flooding, and using the road during or after a hard or long rain is not recommended.

Special Note: Route 89 out to Port Mahon is impassible at times.

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