Bridge repairs began yesterday on the George Washington Memorial Parkway, but despite predictions of huge traffic jams yesterday's rush hours were less rushed than usual, according to U.S. Park Police.

"The media and the Park Service did a good job of scaring everybody off. . . things were easy going today," said Nat Landry, a commuter from Reston who was caught only briefly in a small back-up above Rosslyn where the parkway merges with Spout Run parkway.

Things weren't quite as easy along Chain Bridge Road and other alternate routes that many motorists apparently took to avoid the parkway. There were no major delays, however, and Park Service officials called the first day of construction and road restrictions "a great success."

Delays of an hour or more were forseen by the Park Service and the Federal Highway Administration, which is supervising the redecking of five parkway bridges between Spout Run and Chain Bridge Road (Rte. 123). The project is expected to be completed in the early fall of 1980, with the four lane road reduced to threelanes for most of the construction period. CAPTION:

Picture, Because of road repairs, cars back up on George Washington Parkway near Spout Run Parkway. By Larry Morris-The Washington Post