From the Pole Creek Trailhead (see Getting There
), hike 5.3 miles and turn north on the Seneca Lake Trail. Hike 5.1 miles to the Indian Pass Trail/Highline Trail. Hike this trail, bearing right when the Highline Trail splits to the left. Continue on Indian Pass Trail for 2.4 miles to the Titcomb Basin Trail, passing Island Lake. Take the Titcomb Basin Trail north into Titcomb Basin. Pass both of the large Titcomb Lakes, and hike to the end of the basin to establish a base camp.
Dinwoody Pass (recently renamed Bonney Pass) is in the cirque at the right-hand end of the Titcomb Basin. Scramble to the pass, then cross the Dinwoody Glacier to the lower portion of Gooseneck Pinnacle ridge, crossing the ridge to climb the Gooseneck Glacier. Ascend on the south side of Gooseneck Glacier to the bergschrunds, then climb onto Gooseneck Pinnacle ridge, passing Gooseneck Pinnacle on its north. Continue up Gooseneck Ridge until the summit ridge is attained. Turn north and climb this ridge to the summit.
Because of the glacier travel involved in climbing Gannett Peak, crampons, ice axe, and rope are necessities.
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