On the S slope of Ear Mountain, heading in a flat between Ears Peak and East Peak, flows SE to Crosby Creek 0.5 mi above the mouth of Step Creek, Seward Peninsula Highlands.
So named by a U.S. Geological Survey (USGS) field party "because of pinnacle rock outcrops."
Ear Mountain, The Ears, Ears Peak, East Peak, North Hill, West Peak,
Streams:Deer Creek, Dinsmore Creek, Eldorado Creek, Fox Creek, Goose Creek, Hill Creek, Kreuger Creek, Maria Creek, Maston Creek, Middle Fork Eldorado Creek, Nugget Creek, Pinnacle Creek, Quartz Creek, Saddle Creek, Short Creek, South Fork Eldorado Creek, Step Creek, Tin Creek, Wilkins Creek, Willow Creek,
Valleys:Cabin Gully, Idaho Gulch, Pinnacle Gulch, Shaft Gully, Step Gulch,