Fort Logan and Blockhouse is a site on the National Register of Historic Places located near White Sulphur Springs, Montana.

The fort was originally named Camp Baker for Major Eugene M. Baker, and established on 1 November 1869 on the bank of Smith River ten miles north of the current location.

Its purpose was to protect the Benton freight route as well as local miners and settlers.

[2] Judge William Gaddis, post trader and postmaster since 1873, purchased the fort and surrounding land in 1881 which he made into a large and prosperous cattle ranch.

[6] Josephine Rader became the postmaster in 1907, moving the post office to her ranch, one mile west.