Caption reads "General View of No. 4 Showing the lumber conveyor and a glimpse of the end of No. 4 sorting table. The motor houses in this case are hung under the trestle. the tracks in the foreground leads to the gravel pit where ballast is obtained for the thirty miles of track in the lumber yard."
The steam-powered No. 3 Mill was built in 1871 along the southern shore of the Ottawa river, east of the Madawaska. It burnt in 1875 and a new mill was built on the same site, opening for production in 1882. It was equipped with the newest machinery of the day, including a 190 foot "Iron Bullet Waste Burner." With the construction of Mills 3 and 4, output grew immensely and the McLachlin Bros. were producing 60,000,000 feet of lumber in a good year. A newspaper article from 1923 stated that there was a downturn in business and that only Mill 3 and 4 were in use for a few months per year. The mills ceased operation in 1929. Its demolition date is unknown.
Photograph shows logging crewmen, pointer boat and barge bunkhouse. Among the crew is the foremen, tallyman, cook, cook's helper/camp maintenance and log drivers. In the background are the windmill and beehive burner of the McLachlin Bros. Mill No. 3. The initials 'SB', visible on some oars and the boat may stand for 'sorting boom'.
Constructed in 1867, Mill No. 2 was the second mill built by Daniel McLachlin on the Madawaska river at the bridge. Called "The Little Mill", it was smaller in size and output than Mill No.1, beside it. After the much larger Mills No. 3 and 4 were built along the shore of Chats Lake in the 1870s and 80s, Mills no. 1 and 2 slowly ceased production. All of the mills ceased operation in 1929 due to a decline in business over the 1920s. However, Mill No.2 operated again to saw logs for shipment to the J.R. Booth Company from 1936 to 1938. Its stone foundations were demolished in 1972 when Ontario Hydro constructed the weir.