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New Jersey has its share of forts that don't exist anymore (we've shared the stories of the Revolutionary-era forts Billings and Mercer along the Delaware River), but Elfsborg is the granddaddy of 'em all. Not only is it not there anymore; it was the product of a colony that most New Jerseyans are unaware ever existed.
I first discovered the existence (or maybe the concept) of Fort Elfsborg many years ago on an aimless drive through Salem County, where there are still reliable signs at crossroads to tell you which towns are in which direction. One, somewhere, pointed to Fort Elfsborg. My trusty WPA Guide to 1930's New Jersey noted that Elsinboro Point was the site of the first Swedish settlement in the state. The colonists built a fort there in 1643 "to force Dutch trading ships to haul down their flags."
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It was a perfect case of "looks good on paper" - an idea that probably seemed so logical that the Swedes might have wondered why the Dutch hadn't already secured the area. Reality proved different. The true adversary did not reach the Swedish settlement by ship, but by air, as evidenced by the name the colonists gave their fort: Myggenborg, or Mosquito Castle. The marshy land on which the fort was built was so rich with the pesky skeeters and gnats and their stinging so relentless that it was said the garrisoned soldiers appeared to have been afflicted with a horrible disease. It's small wonder that the fort was abandoned not long after.
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As for the beach itself, the public portion is relatively small, but serviced by a gated 10-stall paved parking lot courtesy of PSEG Nuclear (that's right - free beach parking brought to you by the wonders of nuclear power!). Fans of natural beachscapes will appreciate the rustling phragmites and the dried-out bay vegetation along the high tide line, but that's about it. It's beautiful and somewhat secluded, but best left to the locals.
The WPA guide notes that Oakwood Beach was a summer colony, named for large oaks that once stood there and were taken down to build ships before the Civil War. Given the tidy upkeep of the homes there today, one has to believe that folks still enjoy living the shore life on Delaware Bay, hopefully without the relentless pesky insects.