Crawley branch, from Flat River to milepost 1 miles , was constructed by the St. Joseph Lead Company in 1893 and was purchased by the M.R. & B.T. in 1901; from milepost 1.03 to Columbia Mill, 0.731 mile was constructed by the Doe Run Lead Company in 1900–1901 and was acquired by the M.R. & B.T. in 1908.