Matanuska Glacier is a valley glacier in the US state of Alaska. At 27 miles long by 4 miles wide, it is the largest glacier accessible by car in the United States. Its terminus feeds the Matanuska River. It lies near the Glenn Highway about 100 miles north-east of Anchorage. Matanuska Glacier flows about 1 foot per day. Due to ablation of the lower glacier, as of 2007, the location of the glacier terminus changed little over the previous three decades.