Alexander Bache U.S. Coast Survey Line is a historic geodetic survey line located at Edisto Island,

Charleston County, South Carolina Charleston County is located in the U.S. state of South Carolina along the Atlantic coast. As of the 2020 census, its population was 408,235, making it the third most populous county in South Carolina (behind Greenville and Richland counties). ...

. This base line was surveyed by

Alexander Dallas Bache Alexander Dallas Bache (July 19, 1806 – February 17, 1867) was an American physicist, scientist, and surveyor who erected coastal fortifications and conducted a detailed survey to map the mideastern United States coastline. Originally an army ...

and his assistants during January 1850 as part of their work with the

United States Coast Survey United may refer to: Places * United, Pennsylvania, an unincorporated community * United, West Virginia, an unincorporated community Arts and entertainment Films * ''United'' (2003 film), a Norwegian film * ''United'' (2011 film), a BBC Two f ...

. They buried granite blocks at each endpoint and then placed a granite monument on top of each block. It was listed on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artist ...

in 2007.

References

Monuments and memorials on the National Register of Historic Places in South Carolina Government buildings completed in 1850 Buildings and structures in Charleston County, South Carolina National Register of Historic Places in Charleston County, South Carolina {{CharlestonCountySC-NRHP-stub