Castle Rocks Road is an interesting and scenic byway accessed from Highway 20 north of Mountain Home, Idaho. Taking the byway is almost the same number of miles as staying on the highway, but slower and much more scenic! The surface is good sand and gravel and is open to any automobile when dry and maintained. However, in the early spring and after heavy rain, the road can get serious washouts that may cause problems for the family sedan.
The large rock formations were formed millions of years ago by granite pushed upward into the softer surface materials. Over geologic time, the softer material eroded, leaving the magnificent granite outcroppings for which the area is named.
The surrounding land is part public and part private. Dispersed camping is allowed on public land. There is one reasonably nice dispersed camp area in a small clearing just east of where the road passes between the two tall rocks.
If traveling along Highway 20, Castle Rock Road is a pleasant diversion from highway driving.
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