September 16-19, 1980

Tenpeak Mountain attempt (8281′)

Thunder—Boulder Loop: Thunder Basin to Boulder Basin

Starting Point: White River & Lower Thunder Creek & Chalangin Basin & Thunder Basin & Chalangin Basin & Luahna Basin & Clark Basin & Upper Boulder Basin & Boulder Basin & Boulder Creek return via White River (hike)

Campsites: Chalangin Basin & Thunder Basin & Upper Boulder Basin

Summit Attempt: Tenpeak Mountain attempt (climb to notch via South Slope)