High Quality Content by WIKIPEDIA articles! Tolch Rock is a summit in the City and Borough of Juneau, Alaska, United States. It is located 0.5 miles (0.8 km) west of Mendenhall Lake and 10 miles (16 km) northwest of the city of Juneau. The name was published by the United States Geological Survey in 1962 and entered into the Geographic Names Information System on March 31, 1981.