A barge operator believes it has found a sunken barge in the Ohio River near Pittsburgh, one of 26 that broke loose and floated away during weekend flooding, company officials said Tuesday.

Crews used sonar to locate an object in a stretch of river north of the city, which Campbell Transportation Company Inc. said it presumes to be its missing barge.

The river remained closed to maritime traffic while the company worked to salvage the runaway barges.

Cmdr. Justin Jolley, of the U.S. Coast Guard’s marine safety unit in Pittsburgh, said Tuesday that once the object in the river is confirmed to be the missing barge, “we’re hopeful we can reduce the security zone to that area and allow traffic to resume.”

Seventeen of the barges are secure and under control, while seven remain positioned against the Emsworth Locks and Dam and one is pinned against the Dashields Locks and Dam, the company said.