You'd think it would be called Hillgrove Road. However, as this road leads from Hillgrove village to the property "Stockton" (on the North side of Waterfall Way, back at the turnoff) it gets the monicker of Stockton Road. It is a narrow road, but sealed all the way to Hillgrove and the Mine.
Cache is on the large side of small, or is it the small end of regular? Anyway it is big enough for Swaps.