Loop: Kuss > Mosquito > Treasurevault
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 Class 2 
Risk Factors:
Rockfall Potential: Moderate  
Trailhead:Mosquito Creek
Start:11,560 feet
Summit:13,781 feet
Total Gain:2,800 feet
RT Length:7.25 miles
Last Updated:8/2020


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.


Kuss, Mosquito and Treasurevault are often climbed together, as a loop hike. Some people will also add London Mountain and Mt. Tweto to the loop, making for a much longer day. From the 2WD parking area, near 11,560', head west up the Mosquito Pass road (#1 and #2) to reach the North London Mine - #3. Pass the mine and continue up the rough road (#4) to reach the 12,650-foot saddle between London Mountain (left) and Kuss Peak (right) - #5.

London Mountain (optional)
If you're adding London to your route, use the London Mountain: West Ridge route and return to the road after you've summitted.

Kuss Peak
Turn right, leave the road and start up Kuss Peak's east ridge, without a trail - #6 and #7. Between 12,900' and 13,200', ascend the steepest section of the route before heading left toward the upper terrain - #8. If you're traversing to Mosquito Peak after Kuss, you get a good preview of Mosquito on your way up the ridge - #9. Continue to the summit of Kuss Peak - #10 and #11.

Mosquito Peak
Walk north of the building on Kuss' summit (#12) and begin down the north ridge, toward the saddle between Kuss and Mosquito - #13. You'll see a road down to your left but the route doesn't use the road - continue up Mosquito's south ridge - #14. Near 13,600', turn left (#15) and ascend the remaining ridge to reach the summit - #16 and #17.

Treasurevault Mountain
From Mosquito's summit, Treasurevault is only 0.5 mile away and the hiking is pretty mellow. Drop north off of Mosquito and follow trail segments down the somewhat-loose ridge - #18. As you approach the Mosquito-Treasurevault saddle, pass a mining area and continue to the 13,400-foot saddle - #19 and #20. Cross the saddle and hike approx. 300' up Treasurevault's south ridge to reach the summit - #21 and #22. If your route only includes Kuss, Mosquito and Treasurevault, then you are done gaining elevation but only half way through the loop.

Descent back to Mosquito Creek
Hike north off the summit of Treasurevault (#23 and #24) and follow a ridge north and then east over to a 13,500-foot bump - #25 and #26. Pass the bump and turn left to begin your descent northeast toward the upper end of Mosquito Creek - #27 and #28.

Mt. Tweto (optional)
If you're adding Tweto to your route, use the Mt. Tweto: Southwest Ridge route from 13,200', before you start to descend east back to Mosquito Creek. Summit Tweto and return to 13,200'.

Back to the Trailhead
Near 13,000' (#29) at the base of Mt. Tweto's south face, descend east to reach upper Mosquito Creek, near 12,800'. To avoid a steep slope between 13,000' and 12,600', it's important to make sure you hike northeast far enough before making this descent. Cross easy terrain to reach a mine at 12,600' (#30) and an old road. Follow this road back to the trailhead - #31.


10 miles = Round-trip distance if you include London Mountain and Mt. Tweto
3,400' = Total elevation gain if you include London Mountain and Mt. Tweto

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Route Photos  Print Options

Photo #1
#1: Mosquito Creek trailhead
Photo #2
#2: On the Mosquito Pass road, walking toward London Mountain
Photo #3
#3: At the North London Mine (~12,350’)
Photo #4
#4: Leaving the mine area
Photo #5
#5: At 12,600’ the road passes over the saddle between London Mountain and Kuss Peak
Photo #6
#6: Kuss Peak’s east ridge, from London Mountain
Photo #7
#7: Starting up the east ridge
Photo #8
#8: The ridge is obvious
Photo #9
#9: Looking north to Mosquito Peak
Photo #10
#10: Final pitch
Photo #11
#11: Just below the summit, looking back over the ridge to London Mountain
Photo #12
#12: Leaving Kuss and heading over to Mosquito Peak
Photo #13
#13: Descending to the Kuss-Mosquito saddle
Photo #14
#14: Ascending Mosquito’s south ridge
Photo #15
#15: There’s no trail but the ridge is easy
Photo #16
#16: Approaching the summit
Photo #17
#17: On the Mosquito summit, looking north toward Treasurevault Mountain
Photo #18
#18: Descending to the Mosquito-Treasurevault saddle
Photo #19
#19: Bypass this mine area on the right (east)
Photo #20
#20: At the 13,400-foot saddle
Photo #21
#21: Ascending Treasurevault’s south ridge
Photo #22
#22: On the summit of Treasurevault, looking back to Mosquito Peak
Photo #23
#23: Descending north off of Treasurevault
Photo #24
#24: Looking back
Photo #25
#25: North of Treasurevault, stay on the ridge as it turns east (13,500’)
Photo #26
#26: Hike east to a bump on the ridge
Photo #27
#27: Descending northeast back toward the north end of Mosquito Creek
Photo #28
#28: Near 13,200’. If you’re bagging Mt. Tweto, hike north (dotted line) and do so via Tweto’s southwest ridge.
Photo #29
#29: Dropping back into Mosquito Creek.
Photo #30
#30: Reach the road near a mine area (12,600’)
Photo #31
#31: Returning to the trailhead
Photo #32

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