Luke Herring's death was an accidental drowning, Treasure County Sheriff and Coroner Wayne Robison said Wednesday afternoon.
Searchers in Treasure County on Monday recovered the body of the 26-year-old Wisconsin man west of the Myers Bridge near Hysham. Herring had been missing since Sept. 11.
Officials believe Herring and his horse were swept into the Yellowstone River northeast of Bighorn.
“We believe that when they were trying to cross the river, the fast-moving water took the horse’s footing away,” Robison said.
Herring, who was working as a cowboy for a landowner, was riding his horse to gather cows northeast of Bighorn. Herring’s horse was found drowned in the river Sept. 11.
Robison said a number of agencies, companies and people helped him and Undersheriff Jamie Blakesley, a two-person department, with the large search. At one point, there were 11 search and rescue dogs working the area, he said.