Lethbridge's Fort Whoop-Up has a new operator.

The City of Lethbridge has chosen the Galt Museum to run the tourist attraction.

The move comes after a dust-up between the city and the Fort Whoop-Up Interpretive Society, which ran the National Historic Site for more than 40 years.

The organization left the fort in December — and took about 10,000 artifacts with it. It packed up about 90 per cent of the collection, including Blackfoot headdresses, cast-iron frontier kitchenware, 200 Hudson's Bay Company blankets, a collection of firearms and 700 baseball-sized cannon balls.

Fort Whoop-Up Interpretive Society artifacts

Following a dispute with the city of Lethbridge, the Fort Whoop-Up Interpretive Society packed up about 10,000 artifacts and put them into storage. (Allison Dempster/CBC)

The historic society says its relationship with the city started deteriorating, after flooding in 2012 left the fort with some cash flow problems.

The Galt Museum, which is the largest museum in Alberta south of Calgary, will reopen the fort in the spring.