'I'm delighted to say the least,' said Irwin, who took home $210,000 after winning with a 54-hole total 10-under-par 206. 'I've had a great career, a wonderful experience. It's great to win 30 events, but I don't really look at those or the money, but the experiences along the way.'
Irwin came into Sunday's round with a one-shot lead but began to distance himself from the pack with a five-foot putt for eagle at the fourth and back-to-back birdies at holes seven and eight.
His stellar play continued on the back side, as he ran in an 18- foot birdie putt at the 12th and a 20-footer at 15. His wedge shot at the par-five 17th left him with two feet for his final birdie of the day.
When he has the lead going into the final round, Irwin has gone on to win 19 of 25 events.
In his 29 years on the PGA Tour, Irwin collected 20 victories including three U.S. Open titles (1974, '79 and '90). He continues to crank out major wins on the Senior Tour, with three straight triumphs at the Senior PGA Championship from 1996-98, and U.S. Senior Open victories in 1998 and 2000.
Allen Doyle, who was one of six players a stroke back of Irwin at the start of the day, bounced around the leaderboard Sunday with four bogeys, three birdies and two eagles. He finished with a 69 to tie for second with Tom Watson at five-under 211.
'If I wouldn't have made those two early bogeys, I might have put some heat on him,' said Doyle, whose first eagle came when he holed a pitching wedge from 138 yards at the par-four sixth.
Watson tallied seven birdies and two bogeys for a 67.
'I didn't look good at the start,' said Watson, who dug himself a hole with a 77 in the opening round Friday. 'I hit the ball pretty well yesterday and today. Nobody was going to catch Hale this week. He was really swinging well.'
Jack Nicklaus, the architect of the host Coyote Creek Golf Club, recorded rounds of 68-74-71 over the three days to finish alone at three-under 213.
His fourth-place showing was just his fifth in the top-10 over the last four seasons and his best finish since he tied for second in the 1997 Senior PGA Championship.
Jim Colbert and Mike McCullough, each with one win in 2001, tied for fifth at two-under with Senior Tour rookie Sammy Rachels. Gary Player and Tom Jenkins ended the event at one-over par.
Trevino was forced to withdraw during the first round due to back spasms.