In the Minnesota Historical Society’s vast map collection, there are several that are key resources depicting the early history of Fort Snelling. An 1839 map created by surveyor Lt. J.L. Thompson is now newly accessible to researchers to explore in the Gale Family Library.

While the map was donated to MNHS several years, it has now been encapsulated (encased between protective layers of plastic) by conservators, making it safe for researchers to regularly handle.

The handwritten pen-and-ink map represents an important moment in the fort’s history. Previously the borders of the Fort Snelling military area were loosely defined, and in 1837, the U.S War Department instructed Maj. Joseph Plympton, commander of Fort Snelling, to formalize the borders.

Plympton ordered Lt. E.K. Smith to survey the area, and a March 1838 oilcloth map of a proposed military reservation was sent to Washington, D.C. Plympton also wrote to his superiors about his problems with civilian squatters, who were selling alcohol to the soldiers and depleting timber. Since the fort’s 1820s construction to protect U.S. interests in the fur trade, civilians were drawn to the area by the fort’s presence and formed a small community on government land nearby.

When the War Department ordered a new map with enough land to support the fort’s timber needs, Plympton saw an opportunity to expand military's holdings beyond Smith’s initial survey and rid himself of the squatters. When Lt. J.L. Thompson drew a new map in 1839, Fort Snelling’s boundaries expanded to claim areas as far as St. Anthony Falls and almost all of the lakes in what's now Minneapolis.

In May 1840, based on Thompson’s map, soldiers evicted all civilians living illegally on U.S. military land. Some of the squatters moved down the Mississippi River and created a community called Pig’s Eye, eventually renamed St. Paul.

The Thompson map is one of an estimated 50,000 maps in the MNHS collection, including several rare handwritten ones depicting Fort Snelling, like:

• The earliest map of the fort in the MNHS collection, dating to 1823 when the fort was still called Fort St. Anthony. This topographic sketch also includes margin notes describing the fort's ongoing construction and early operations.
• An 1835 map created by Lawerence Taliaferro, agent of the St. Peters Indian Agency, showing many of the cultural and natural features of what’s now Minneapolis
• An 1853 topographic map of the Fort Snelling area created by Lt. James W. Abert and civil engineer George Fuller a few years after Minnesota Territory was formed in 1849

For more on Fort Snelling’s history, visit www.mnhs.org/fortsnelling.

About the Minnesota Historical Society
The Minnesota Historical Society is a nonprofit educational and cultural institution established in 1849. MNHS collects, preserves and tells the story of Minnesota’s past through museum exhibits, libraries and collections, historic sites, educational programs and publishing. Using the power of history to transform lives, MNHS preserves our past, shares our state’s stories and connects people with history. Visit us at mnhs.org.

The Minnesota Historical Society is supported in part by its Premier Partner, Explore Minnesota Tourism.