A marine fell 200 feet last night from a scenic overlook on the George Washington Memorial Parkway near Chain Bridge to an embankment on the Potomac River and was rescued three hours later, U.S. Park Police reported.

Lance Cpl. Martin Shively, 20, suffered head and neck injuries and facial cuts and scratches in the fall, police said.

Police said Shively, who is assigned to Henderson Hall Marine post in Arlington, was on an outing about 8:30 p.m. with Susan Bowles of Forestville when he climbed over a fence to get a closer look at the river. He slipped, falling through trees and shrubbery, and landed on the embankment near the river's edge.

Police said Bowles climbed down the cliff and learned that Shively was conscious but unable to move. She then notified a passing motorist, who alerted a Park Police officer.

It took about 35 rescue workers from four jurisdictions almost three hours to move him from the riverbank.

As a Park Police helicopter hovered overhead to illuminate the area, D.C. harbor police tried to reach Shively by powerboat while workers from Arlington fire and rescue and Glebe Volunteer Fire Department climbed down the rocky terrain with a mesh litter, authorities said.

Rescuers had hoped to take Shively aboard the boat, but it developed engine trouble and he was carried up the cliff, police said. He was taken to Arlington Hospital where he was listed in fair condition.