On Highway 9, 1 mile south of Alma, turn west onto Mosquito Gulch Road. Drive 6.8 miles to a point where the road turns left and crosses Mosquito Creek before climbing up toward Mosquito Pass. There’s parking 0.1 mile after the left turn.

Details:

This is an "unofficial" trailhead but includes parking and a good place to park if you have a 2WD vehicle. From your parking spot, walk to the junction of the Mosquito Pass road and the 4WD road which heads northwest toward the upper end of Mosquito Gulch - Photo #1. Hike up the 4WD road (Photo #2) for 0.5 mile to reach another road junction - Photo #3. Turn right and switchback east up a narrow 4WD road which goes to a mine in the upper basin.

Near 12,100’, the view opens up and the road continues north toward the upper end of the basin - Photo #4. Continue (Photo #5) another mile to reach mine ruins at 12,600’ - Photo #6. Turn left and continue west toward a broad saddle above the northwest end of the basin - Photo #7, Photo #8 and Photo #9. Near 13,100’, and before reaching the bump on the ridge shown in Photo #9, angle right (Photo #10) and ascend rocky terrain to gain the base of Tweto’s southwest ridge - Photo #11, Photo #12 and Photo #13.

Now near 13,300’, turn right and follow the ridge northeast toward the summit - Photo #14 and Photo #15. Stay near the ridge crest and ascend sometimes-loose talus (Photo #16 and Photo #17) to reach the summit. Photo #18 looks northeast to 14ers Quandary Peak, Mt. Democrat, Mt. Cameron and Mt. Bross.