You can drive right to the cache. Check out the other cache in the woods nearby in the State Park.
Olallie State Park (the cache is outside the park) is one of our favorite places to come in August to splash about in the river and jump into the deep pools. There's a really deep pool by the cache where you can see fish.
The cache is a small Geocaching.com lock-and-lock, waterproof, with a log and pencil, and space for trackables. Please make sure to hide it again exactly where it was (with the same orientation, you shouldn't have to force it), and watch out for muggles. There is no need to go near the water or inside any fences.
FTF to Hop's House!!