I don't know the ride history, but suspect the name may have something to do with the ride profile looking a lot like shark jaws/teeth with all the hill peaks. I think the Dan Henrys have a white shark painted with them, too. Many of the roads in that area have multiple Dan Henrys - White with yellow directions are from the Bear ride in July - another nice hilly ride, though shorter and not as severe. There are also plain white DHs from another ride crossing through.