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!
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe