Relocating a Lighthouse
The Decision to Move
Moving a lighthouse is a last resort. The building is, by its nature, in exactly the right place — that is why it was put there. To move it is to concede that the place itself has changed, that the coastline has retreated, that the land that once supported the tower has been consumed by the sea or is about to be. The decision involves a collision of competing interests: navigational necessity, heritage preservation, engineering capability, and the question of cost. For most lighthouse authorities, the threshold for relocation is reached only when the remaining margin between the tower and the cliff edge becomes genuinely dangerous to the structure — typically less than ten to twenty metres.
Cape Hatteras: The Benchmark Relocation
No lighthouse relocation has received more attention or generated more controversy than the move of the Cape Hatteras lighthouse in North Carolina in 1999. The tower — 64 metres tall, 198.5 metres to the focal plane of its first-order Fresnel lens, built in 1870 and the tallest brick lighthouse in the United States — had been constructed on Hatteras Island, a barrier island of mobile sand, with approximately 450 metres between the tower and the shoreline. Over the following 130 years, natural barrier island migration and the interruption of longshore sediment transport by the jetties at Oregon Inlet progressively reduced that margin.
The relocation project, carried out by International Chimney Corporation and Expert House Movers under contract to the National Park Service, began in June 1999. The tower was first separated from its brick foundation and transferred to a steel and timber lifting mat resting on hydraulic jacks. The mat was placed on a track of interlocking steel panels laid directly on the sand, and a push-and-pull hydraulic system advanced the tower a few metres at a time over twenty-three days. The total distance moved was 884 metres — a journey that ended with the lighthouse precisely realigned to its original orientation relative to the North Star, as specified in the original 1870 survey documents. The light was re-lit from its new position on 13 November 1999. Total cost was approximately eleven million dollars.
The Gay Head Lighthouse, Massachusetts
The Gay Head lighthouse on Martha's Vineyard presented a different engineering challenge from Cape Hatteras: the tower is smaller (a cast-iron octagonal structure from 1856, 14 metres tall, set on a 10-metre brick base) but sits on the edge of the actively crumbling Gay Head Cliffs, a UNESCO-designated Wampanoag cultural landscape of fragile polychromatic clay and silt strata. The cliff edge had advanced to within nine metres of the lighthouse foundation by 2015, with accelerating erosion following the storms of 2012.
The relocation contractor, Expert House Movers (the same firm involved at Cape Hatteras), used a system of dollies running on temporary rail tracks to move the 143-ton tower 38 metres from the cliff edge in May 2015. The operation took four days. Because the lighthouse sits on a protected cultural landscape, the rail and dolly system was designed to minimise ground disturbance, and the tower was placed on a new concrete foundation prepared in advance. The original first-order Fresnel lens was not reused; a modern LED optic maintains the light characteristic, and the Fresnel lens is displayed in the Martha's Vineyard Museum. The lighthouse resumed operation from its new position in July 2015.
Nauset Light, Cape Cod
The Nauset lighthouse at Eastham on Cape Cod is a cast-iron tower of 1877 that was itself a relocation: moved from its original site at Chatham in 1923 when the Chatham twin lights were replaced by a single new tower. By the early 1990s the Cape Cod National Seashore's surveys showed the Atlantic cliff at Eastham eroding at more than a metre per year, with the lighthouse approaching dangerous proximity to the edge. In 1996 the Nauset Light Preservation Society organised a second relocation of the tower — 36 metres inland — using hydraulic dollies. The operation was completed in 1996 and took about a week. The lighthouse was restored and relighted and remains active, showing its red and white flashing characteristic.
The Lighthouse of Rubjerg Knude, Denmark
Not all lighthouse relocations are driven by water erosion. The Rubjerg Knude lighthouse on the northwest Jutland coast of Denmark was threatened by sand — a migrating dune system that had by 2019 buried the former keeper's quarters to eave height and was advancing on the tower itself. The lighthouse, built in 1900 and decommissioned in 1968, was by the early 2000s entirely surrounded by sand and had become a tourist attraction precisely because of the dramatic visual effect of a lighthouse half-buried in a dune landscape.
In October 2019, the Rubjerg Knude lighthouse was moved 70 metres inland on a system of steel tracks and hydraulic jacks, the entire operation taking about twelve hours. The move was broadcast live on Danish television and watched by a substantial online audience. The lighthouse, having arrived safely at its new position, was opened to visitors. The move does not restore it to active navigation use; the tower is now a heritage structure on the cliff top, but it will remain there significantly longer than it would have without the relocation.
Sweden's Kullen Lighthouse
The Kullen lighthouse on the Kulla Peninsula in the Skåne province of southern Sweden — a granite tower from 1900 housing a large rotating lens, active with a range of 27 nautical miles — has not been relocated but has been subject to extensive cliff-stabilisation work after geotechnical surveys in the 2010s identified progressive cracking of the headland's gneis formation. The stabilisation approach, involving rock bolting and drainage improvements, represents the alternative to relocation: treating the underlying geology rather than moving the structure. Whether this approach proves adequate over the long term, given accelerating precipitation and storm frequency in the Baltic region, remains to be seen.
Engineering Principles and Limits
The relocation of a tall, heavy masonry lighthouse requires solving problems that have no standard engineering precedent. The tower must be transferred from its foundation to a transport frame without inducing differential settlement that cracks the brickwork. The transport surface must be able to bear the tower's weight while allowing controlled, uniform movement. The new foundation must be prepared to the same standard as the original, including proper drainage and geotechnical analysis.
The practical weight limit for hydraulic dolly-based lighthouse relocation appears to be around 5,000 to 6,000 tons — the Cape Hatteras move at roughly 4,900 tons was close to the upper boundary of what had been done at the time. Heavier granite structures like the Bodie Island lighthouse in North Carolina, completed in 1872 by Dexter Stetson and standing on a barrier island, have been protected by beach nourishment programmes rather than relocation, judging the engineering challenge too great and the navigational importance sufficient to justify the ongoing cost of nourishment.
Open the map to locate the lighthouses discussed in this article and explore the barrier island coastlines and soft-cliff shores where relocation is already under consideration — the geography of erosion risk is visible in the map's coastal topography.