Nils F. Ambursen, a Norwegian-American civil engineer, is known for his innovative designs of dams, which often utilized concrete slabs and buttresses. Several of his works have been recognized for their historical significance and are listed on the National Register of Historic Places (NRHP). Here are a few notable dams designed by Nils F. Ambursen that are listed on the NRHP:
Riverfront Park Historic District: Located in North Adams, Massachusetts, this district includes a dam named the Natural Bridge Dam, which incorporates Ambursen's design principles.
Livermore Falls Limington Maine: The Livermore Falls Dam and associated structures are part of a historic district that benefits from Ambursen's innovative engineering designs.
Penacook Lake Dam: Similar to other Ambursen dams, this uses the unique buttressed slab construction technique and is listed due to its engineering significance.
These examples reflect his contribution to engineering and historical preservation. For more detailed information about these dams, it would be beneficial to consult the National Park Service's National Register of Historic Places database.