As with the others, my brother and I took the standard Monogram Lake Trail from Cascade River Road.
After the crazy slog up to the lake, we crossed the log jam at the stream outlet, and then explored around until we found the bootpath - it's a bit hard to find at first, but it becomes more visible after not too long.
Fair warning - this trail isn't often taken (and Little Devil Peak isn't often climbed), and we frequently lost the precise trail in overgrowth, and had to play Choose Your Own Adventure in more than one section. Definitely take pictures of sketchy areas, and where you resume the trail, for reference on the return leg of the journey.
We made the top of the ridge arm about an hour or so before the sun began to dip, so we were treated to majestic views of the Cascade River Valley, Eldorado peak, Sahale, Glacier Peak, and countless others.
We didn't have time to continue up the ridge to summit Little Devil itself, so we consoled ourselves with photos of the sun setting over the mountains, instead.
We got lost more than once on the way down, too, and had to backtrack a bunch to find the proper trail. So keep that in mind if you tackle the LDP ridge. It's pretty hairy.

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