Daniel J. Evans, a moderate Republican who dominated Washington State politics as a three-term governor and a United States senator and who was repeatedly considered for the vice presidency, died on Friday night. He was 98.

His death at his home in Seattle, which was about five blocks away from where he grew up, was from natural causes, said Dan Evans Jr, a son.

“Dad lived an exceptionally full life,” said a written statement issued on Saturday by Mr. Evans’s sons, including Mark and Bruce Evans. “Whether serving in public office, working to improve higher education, mentoring aspiring public servants,” they said, “he just kept signing up for stuff right until the end. He touched a lot of lives.”

Descended from seafarers who founded a Puget Sound shipping business in the 19th century, Mr. Evans championed education, civil rights and environmental causes as Washington’s 16th governor from 1965 to 1977. He served in the Senate, with some frustration, from 1983 to 1989.

He was a mountain climber and skier, a master yachtsman, an eloquent speaker and, in his first term as governor, a fresh new face in national politics at a time when Republicans were reeling from Senator Barry M. Goldwater’s crushing defeat in the 1964 presidential election.

At the Republican National Convention in Miami Beach in 1968, where Richard Nixon was nominated for president, Mr. Evans was chosen to deliver the keynote address. Instead of the usual oratorical exercise in party self-congratulation, the rising Republican star challenged America to face its problems: the Vietnam War, urban decay, civil rights and unemployment.

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