It was still a " Whole Mountain " in Sep of 1977. It blew it's lid and lost about 1,600 feet. in May of 1980. I actually summit this peak in July 1979 when it was 9,600 .More climbers died on this peak " Before it blew " than on Mt. Rainier or any other Northwest Peak. Reason?? MOre people tried and yes you could climb it in a T-shirt and jeans on a nice day, but the weather is fickle here and things are icy up near the steep top section,, ( Note: Ape Glacier On Right Right Of Mountain, named after an incendent in 1924 which what were called " Ape Men " rocking mines cabin. Shoestring glacier in the middle of mt.