Perennial Rock Creek crossing from upper Park-TH Start location; It is not recommended to drive your high clearance 4x4 down access road from TH Start (see pic 2) and attempt to vehicle cross this seemingly simple water crossing.. Note: there are partially hidden 2-3ft ledge drops and climb outs in-order to cross (I know as I drove across both ways ); No problem hiking across as long as Rock Creek is not flooded;