Outer Banks History: Moving the Cape Hatteras Lighthouse
June marks the anniversary of picking up the 4,400 ton, 200 foot tall black and white spiraled Cape Hatteras Lighthouse and moving it 2,900 feet to the southwest. A wild feat of engineering!
But what's the scoop? Seems like a crazy amount of effort. Why...and how...was it done?
For the June installment of our OBX History blog series, we're going to take trip in the way-back-machine to understand a bit more about the Cape Hatteras Lighthouse - what is it, where it came from, why it needed to be moved, and how it was moved.
Cape Hatteras Lighthouse Factoids
As with most research these days, Wikipedia is a great place tostart. :) Here are some highlights about the Cape Hatteras Light:
- Cape Hatteras Lighthouse is recognized by the National Park Service as the tallest lighthouse in America.
- At a height of 208 feet it is the 23rd tallest traditional lighthouse in the world.
- Approximately 1,250,000 bricks
- 268 steps to reach the light
- The Cape Hatteras lighthouse is still considered an operational aid to navigation maintained by the United States Coast Guard and the National ParkService.
- The light at the top is automated and is visible every 7.5 seconds. In good visibility conditions, the beacon can often be seen for 20 miles out atsea.
- Over 1 million bricks were used in the construction of the structure, which was built between 1868 to 1870 at a cost (then) of $167,500.
- The lighthouse is open for tours from the third Friday in April to Columbus Day. FYI - it's a 12 story climb!
Why Does Cape Hatteras Need a Lighthouse?
The OBX is referred to as the "Graveyard of the Atlantic" for good reason. AtlanticOcean currents just off the coast of the Outer Banks have historically made for excellent travel for ships, except in the area of Diamond Shoals, just offshore at Cape Hatteras. The warm Gulf Stream ocean current collides with the colderLabrador Current, creating ideal conditions for powerful ocean stormsand sea swells. As a result, sandbars are constantly shifting and predictable navigation becomes very difficult...and shipwrecks happen when sandbarssurprise captains.
To aid in navigation around the Outer Banks, Congress authorized the construction of the Cape Hatteras Lighthouse.
Cape Hatteras Lighthouse History
The original Cape Hatteras Light was completed in 1803, but due to a weak light and damage sustained during the Civil War, a second lighthouse was approvedand completed in 1870, 1,500 feet from the ocean.
The ocean has been inching closer to the Light since it's completion in 1870; waves gnawing at the beach, and relentless moving towards the tower. Over theyears, many attempts have been made to arrest the encroachment of the persistent surf, but little progress was made.
The tower was in and out of commission on a few occasions as efforts were made, but in the end, Mother Nature is a difficult foe to tame. Storms drag sandfrom the small strip of beach deposit on the Sound side. A western migration of the OBX that has proceeded for thousands of years. Trying to stop thisunrelenting, natural process is a thankless task. By 1970, the Lighthouse was just 120 feet from the ocean; a small step from toppling into the sea.
As we've experience with the heated OBX bridge debates recently, nothing happens quickly on the Outer Banks. It seems like the Cape Hatteras Lighthouse was in a precarious position since the early 1900's, yet the decision to move it was not made until almost 100 years later.
After much debate, including a plan to build a wall around the Light, which would have ultimately created a little island, the decision was made the movethe Light 2,900 feet to the southwest.
The Lighthouse has a storied history, is an iconic symbol, and still serves as a beacon to passing ships in dangerous water. As crazy as it seems to move a4,400 ton, 208 foot tower 2,900 feet (oh, and by the way, the ocean will keep progressing towards it!), the OBX was not prepared to let the candy stripedpole slip into the watery grave.
Congress appropriated the funds in 1998, and the move Cape Hatteras Lighthouse move was on in June 1999.
How was the Cape Hatteras Lighthouse Moved?
How exactly do you move such a monster? Very carefully. :) Here's a great explanation from the National Parks Service, and here are a few highlights...
- International Chimney Corp. of Buffalo, New York was awarded the contract to move the lighthouse, assisted, among other contractors, by Expert HouseMovers of Maryland.
- Simple explanation: Lift it off its foundation, transfer the load to a transport system, move the tower along a prepared move route, and install it onthe new foundation.
- The foundation was replaced by temporary beams, and pressurized jacks were used to life the Light six feet to allow roll beams to be installed.
- A support frame was built around the tower in preparation for it to be rolled 2,900 feet.
- The tower started moving on June 17, 1999.
- Push jacks were used to pull the frame forward five feet at a time.
- 60 automatic sensors were used to make sure the tower did not shift, and a weather station was added to the top to monitor the OBX winds.
- On July 9, 1999 the Cape Hatteras Lighthouse was carefully placed on to it's new foundation 2,900 feet from the ocean.
- According to the current estimates, erosion should not be a concern for 100 years. We'll see about that! :)
If you've never been to the Cape Hatteras Lighthouse, it is well worth the trip. A gorgeous beach - with great surfing, a historical site, and an amazingview. And now you have some great history to impress (or bore) your kids with!
Monday, June 25, 2012