EUGENE–A newly discovered map may help solve one of the great mysteries associated with the Lewis and Clark expedition–the exact location of their west-coast encampment, Fort Clatsop.

The map was drawn by an unknown member of the 1851 U.S. Coast Survey that mapped the lower Columbia River near Astoria, Ore.

"I came across the map while doing research on Oregon Indian history at the National Archives in Greenbelt, Maryland," says Scott Byram, a doctoral degree candidate in anthropology at the University of Oregon. "I didn’t know whether Fort Clatsop investigators had already seen the map. But I knew they were trying to pinpoint the exact location of the fort, and I had a hunch that if they hadn’t seen the map, they would very much want to get a copy."

Byram’s hunch paid off.

"I was intrigued when Scott called," says James Thomson, National Parks Service (NPS) regional archaeologist. Thomson directs the Fort Clatsop Project, a joint effort by the NPS, the Museum of the Rockies and the University of Washington to find the fort. "And when I saw a copy of the map, I was impressed with how professional a rendering it was. This gives us a lot of hope."

Meriwether Lewis and William Clark, at the end of their arduous trek westward, built Fort Clatsop near the mouth of the Columbia River. The fort served as a secure encampment at which the travel-weary explorers would spend the winter of 1805—06 before making the return journey to the American east.

Because of the historical significance of the Lewis and Clark expedition, the Fort Clatsop site is now a National Memorial overseen by the NPS and visited each year by thousands of tourists.

"Yet within the boundaries of the memorial park, the exact location of the fort is not known," Byram explains.

Why? No maps of the fort exist that were drawn by members of the Lewis and Clark expedition. In fact, before Byram’s map, historical records reported the location of the encampment somewhere between one-and-one-half and four miles from the mouth of the Lewis & Clark River.

Homesteader recollections of the fort ruins recorded at the turn of the century by the Oregon Historical Society point to a general location, but provide conflicting information about the specific site. Compounding the problem is uncertainty about river changes in the past 200 years.

Archaeological excavations in 1948, 1956, 1957 and 1961, as well as the present Fort Clatsop Project, failed to find a definitive location.

Byram’s map, which remains well preserved after nearly 150 years in the U.S. Coast Survey archives, will provide researchers with valuable new information.

For example, the fort (or "hut" as it is labeled on the map) is shown at the very edge of a slope, which descends toward the river’s flood plain. The fort’s shape and orientation are also suggested by the small square used to mark the structure.

"The Coast Survey staff were skilled mapmakers, and the 1851 map typifies their attention to detail," Byram notes. "The care that went into producing this map is especially impressive considering that it may have been drawn in a canvas tent on the beach at Young’s Bay, or in the cabin of a schooner in the harbor at Astoria."

Byram’s research was done in conjunction with the Coquille Indian Tribe/University of Oregon "Southwest Oregon Archival Research Project," (SWOARP) along with independent research Byram is conducting for other ethnohistoric writing projects. In developing the SWOARP project, both the Coquille cultural resources program and the UO Department of Anthropology intended this search of archives to benefit other anthropological and historical research in the region.

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