Central Coal & Coke Company announced in 1914 that its subdivision Delta Land & Timber Company would construct a sawmill facility at Conroe. The mill began operations on July 8, 1915. Fire, in 1924, ravaged the plant, destroying twelve Moore dry kilns, 1.4 million feet of lumber, a cooling shed, two big sorting sheds, and 2599 feet of an overhead monorail system. Delta Land & Timber leased the complex to Conroe Lumber Company in 1933 and then sold it to Conroe Lumber in 1935. The Conroe Lumber Corporation operated the Delta (4-C) mill, on lease, from July 1933 until the end of October 1935. Ownership of the mill then transferred to Conroe Lumber the first week of November, 1935. Included in the transfer was the old J. O. H. Bennette logging tram, the Conroe, Byspot & Northern, with two Delta locomotives and seventy-five to eighty log cars.
Throughout Conroe Lumber operations, the mill was poorly supplied with logs. The mill was closed often, sometimes for a month or more, because of this reason. Use of the Delta tram was closed, and logging was done off spurs on the main lines. Conroe Lumber had rail sidings (for banking logs) at Rye, Timber, and Kountze, on the Santa Fe, and at Crockett, on the International & Great Northern. The availability of timber was sporadic, and, when it did come, managers reported logging operations in a favorable light, commenting that the loggers were trying hard "to beat the band." The mill permanently closed in November, 1939, because of a lack of timber.