Blue ice sheet, 12 mi (19 km) long, 1.5 mi (2.4 km) wide, and more than 100 ft (30 m) high. It flows from the southern half of the huge Juneau Icefield, which lies in the Boundary Ranges in southeastern Alaska, U.S. A relic of the Little Ice Age (16th century to the mid-19th century), it recedes about 100–150 ft (30–45 m) a year. The adjacent Mendenhall Lake began to form about 1900 and is now 1.5 mi (2.4 km) long and 1 mi (1.6 km) wide.
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