With no negative or prohibitive signage, we were able to *carefully* drive my car to approximately 4485' elevation... where the road got noticably steeper and rougher. A high-clearance vehicle would be needed beyond that point (and possibly before it, as the road continues to deteriorate). We had passed an open gate at approximately 4300' elevation.
We hiked to the summit, encountering some snow on the roadway which was mostly avoidable. From where we parked, it only took us 55m to the summit. No ticks found! Great views from the summit. While we were at the summit, three tribal workmen arrived in ATVs. They asked what we were doing, so we told them we were driving along the "Coulee Corridor Scenic Byway" (Highway 155) and saw the small lookout sign alongside the road. Figuring it led to the lookout we had seen from town (Omak), we followed the road as far as we could. The man smiled, introduced himself, and then told us a little about the reservation fire lookouts still being manned each Summer. It was very pleasant.
He made two particular comments that are worth passing on to others:
1) If you park alongside the access road, leave a dated paper note in the window (preferred) or on the dashboard, stating that you are walking up the road (or to the lookout) and will be back soon. Then if any workers see the vehicle they will know it is not stolen or abandoned.
2) Stay on the road. Do not go hiking in the woods/off-road.
I joined Klenke and Redwic for a peakbagging frenzy over Memorial Day weekend. 3 of the peaks were lookout locations. I found 2 ticks on my pant legs at the summit of Omak Mountain.