A boating accident on Bighorn Lake Saturday night left a Billings woman dead and one man hospitalized in serious condition, according to a press release from Bighorn Canyon National Recreation Area. A search continues for two men who were also on the boat.

The body of Tammy Scoville, 59, was recovered from the water Sunday, according to the release.

The injured man, 63-year-old Robert Ludwick of Billings, was located on the shoreline by Big Horn County deputies, the release states. He was transferred by boat to Ok-A-Beh Marina and brought to St. Vincent Healthcare by air ambulance.

The two missing men are aged 35 and 36, national recreation area spokeswoman Christy Fleming said Monday morning.

Ludwick remains hospitalized in serious condition, St. Vincent spokeswoman Angela Douglas said Monday.

The boating accident was reported by an off-duty deputy Saturday night, who told dispatchers that a vessel had sunk near Dayboard 7 on the lake and two people were in the water, the release states. The location of the accident is roughly 7 miles south of Yellowtail Dam on the Montana side of the national recreation area.

The incident was reported at 9:26 p.m., according to Big Horn County dispatch.

No further details have been released about the cause of the incident. Searchers have recovered pieces of the boat, Fleming said, but officials are unsure what caused it to sink.

National Park Service; U.S. Coast Guard; and Montana Fish, Wildlife and Parks personnel continue to search for the two missing boaters, Fleming said. Big Horn County deputies also responded to the incident.

Fleming said divers from the NPS Submerged Resources Center are assisting in the search, and that a Salt Lake City contract dive crew will also be at the scene.

"As of this morning, we had about 10 people, but it will probably go up to 20 by this afternoon with all those different entities helping," Fleming said.

No closures are currently in place, but boaters are asked to use extreme caution in the area between dayboards 5 and 9 and to keep wakes to a minimum. Delays and closures in the area are possible between 7 a.m. and 7 p.m.

Monday's search covered the shoreline and water surface between dayboards 6 and 9, and the eastern shoreline and surface from dayboards 1 to 7. A sonar system was able to search to depths of 130 feet over a range of about 450 feet per side, according to an evening press release from Fleming.  

Tuesday's search will use the sonar information to direct crews, who will try to scan deeper in the lake, which has been measured to a depth of 380 feet. The search will also used remote-operated vehicles. 

The surface and shoreline search will focus between dayboards 4 and 14. 

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