Serena Beth Strieby, 27, valedictorian at High Point Senior High School in 1968 and a graduate student at Boston College, drowned Saturday in a boating accident on the Dead River near Skowhegan, Maine.

Miss Strieby was one of 11 persons on four rafts who were on a 16 mile trip down the river. One of the rafts capsized in rapids, spilling three persons into the river.

Three other persons, includin Miss Strieby, who were on a second raft, attempted to help the persons in the water. Miss Strieby's raft also capsized and she drowned. The others were rescued unhurt.

Miss Strieby was born in Washington and grew up in College Park.

She earned a bachelor's degree from Harvard University and a master's degree in psycology from Boston College. She was working on her doctorate in psycology at the time of her death.

Miss Strieby was a member of Berwyn Baptist Church in College Park.

She is survived by her parents, Mr. and Mrs. LaRue T. Strieby of College Park, and a sister, Marjean Schapsmier, St. Louis.

The family suggests that expressions of sympathy be in the form of contributions to the Serena Beth Strieby Memorial Fund at Berwyn Baptist Church.