Starting at the M trailhead and follow signs north for the foothills trail. After the pomp/sac col you start following signs for North Cottonwood Canyon, if you follow this you will get off trail but it goes. Instead, you can use the old trail and descend a tiny bit into Corbly canyon before going up and over into N. Cottonwood. Continue on and find the N. Cottonwood trail down to Johnson Canyon and enjoy the flow of the trail until the parking lot.
Mountain goats and grouse galore! This is a special and less travelled route compared to the Bridger Ridge. It'll just be you, the birds and the trees for sections.