Alexander Bache U.S. Coast Survey Line, Historic geodetic survey line on Edisto Island, Charleston County, United States.

The Alexander Bache U.S. Coast Survey Line on Edisto Island consists of two granite monuments, each placed atop a buried granite block at the line's endpoints. Surveyed in January 1850 by Alexander Dallas Bache and his assistants for the U.S. Coast Survey, it was listed on the National Register of Historic Places in 2007.

In January 1850, Alexander Dallas Bache and his assistants surveyed this base line on Edisto Island for the United States Coast Survey. They buried a granite block at each endpoint and set a granite monument on top of each block. The line was listed on the National Register of Historic Places in 2007.

The line is a base line of the U.S. Coast Survey, measured in January 1850 by Alexander Dallas Bache and his assistants. Its endpoints are marked by granite monuments set on buried granite blocks, and the site was listed on the National Register of Historic Places in 2007.

The line lies on Edisto Island in Charleston County, South Carolina, and was listed on the National Register of Historic Places in 2007. Its two endpoints are marked by granite monuments set on buried granite blocks; the source gives no road name, so check the coordinates 32.50560, -80.31030 before setting out.

The line's endpoints were fixed by granite blocks buried in the ground, with a granite monument set on top of each block. The 1850 base line was surveyed for the U.S. Coast Survey by Alexander Dallas Bache and his assistants, and the site was listed on the National Register of Historic Places in 2007.