I've never heard of them - but I live in NE Oregon. Grants Pass is in SW and is about a 7.5 hour drive from where I live in Pendleton. There are no direct routes from NE to SW Oregon so to get there I would have to drive due west for 3 hours then due south for 4.5 hours. (Actually, there are plenty of back roads that could get me there but it would take much longer than 7.5 hours.)
I've driven by Grants Pass on the freeway but never pulled off . . . sorry I can't be more help. I know the Rogue River runs through there though and there's some mighty fine fishing in those waters.