Archaeology at Fort Mackinac – Provision Storehouse

The “Store House” is the structure labeled “I” on the west end of the fort on this drawing from 1796. Credit: Historical Society of Pennsylvania

One of the largest archaeological excavations to take place at Fort Mackinac was at the site of the original provision storehouse. This excavation was carried out during the summers of 1981-82 by University of South Florida field schools directed by Dr. Roger T. Grange Jr. These were part of the commemoration of the bicentennial of Fort Mackinac. Dr. Grange’s final report was published as Number 12 in the Mackinac State Historic Parks’ Archaeological Completion Report Series (Excavations at Fort Mackinac, 1980-1982: The Provision Storehouse – Mackinac State Historic Parks | Mackinac State Historic Parks (mackinacparks.com) and was the basis of this blog post.

 The provision storehouse is an unusual structure because is has been excavated twice, in two different locations. It was originally built by British soldiers just inside the water gate at Michilimackinac (on the south side of the straits) in 1773. Being a relatively new building, it was moved to Mackinac Island when the garrison was relocated in 1781 and appears on early maps of Fort Mackinac.

 The mainland site was excavated in 1959 and the storehouse reconstructed in 1961. Today it houses the orientation film at Colonial Michilimackinac.

Scissors from the early American occupation.

Leather shoe parts from post War of 1812 deposit.

 On the island, the structure served as a storehouse through the first British occupation (1780-1796), the first American occupation (1796-1812) and the second British occupation (1812-1815). After the War of 1812, it was converted into a barracks, with workspace for military tailors and shoemakers, and a hospital. Its use as a hospital (1815-1827) overlapped with the service of Fort Mackinac’s most famous post surgeon, Dr. William Beaumont. A portion of the storehouse appears as a log structure next to the 1827 hospital painted by Mary Nexsen Thompson shortly before it burned down days before completion.

Microscope lens, possibly used by Dr. Beaumont.

Mary Nexsen Thompson painting of 1827 hospital with portion of storehouse. Credit: William L. Clements Library, University of Michigan

 A completely new hospital building was constructed in 1828, over the middle of the storehouse/1827 hospital, but oriented north-south instead of northeast-southwest like the original. A portion of the west end of the provision storehouse behind the 1828 hospital was the area of the archaeological excavation. No remnants of the provision storehouse are visible today, but you can stand on the original location while touring Fort Mackinac (opens May 4, 2023). You can also visit the reconstruction of the original provision storehouse at Colonial Michilimackinac (opens May 10, 2023) and learn more about Dr. Beaumont’s work at the American Fur Co. Store & Dr. Beaumont Museum in downtown Mackinac Island (opens June 3, 2023).