Route 18 to Route 173: The KPRA advised for this route is less than 30 feet.
Route 189 runs inside the San Bernardino National Forest. Its headquarters is located in San Bernardino. For more information, you can call them at (909)382-2600.
For those who are desperate to get into Lake Arrowhead from Route 18 north can always take Route 189. There are several places to stay along Route 189, including the Romantique Lakeview Lodge (Really: "Romantique"!), the Lake Arrowhead Resort, and the Arrowhead Pine Rose Cabins. Mind the curves.