The switchback road will get you fairly high up, depending on how many scratches you want to incur. I parked at 8,200' or so. After ditching the vehicle, it was a nice road walk to the mail truck, then a short climb up the ridge to the North Peak for a snack. Afterward, I traversed up high on the connecting ridge (class 3 scramble, not too difficult) to Middle Sacajawea to find the summit register. Lots of strange and entertaining items in there ;) Lovely views despite the smoke everywhere this Summer. If one would like to get on Monument Peak from the North Sacajawea Peak, it is just a ridge climb away. Just allot yourself enough time, that's all!