Lake Pepin

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Lake Pepin
Lake from the Minnesota side
Location	Minnesota/Wisconsin
Primary inflows	Mississippi River
Primary outflows	Mississippi River
Basin countries	United States
Surface area	40 sq mi (100 km²)
Average depth	18 ft (5.5 m)
Frozen	winter
Settlements	Lake City, Bay City, Pepin, Maiden Rock, Stockholm

Lake Pepin is a naturally occurring lake, and the widest naturally occurring part of the Mississippi River. It is a widening of the river on the border between Minnesota and Wisconsin. The formation of the lake was caused by the backup of water behind the sedimentary deposits of the Chippewa River's delta. It has a surface area of about 40 square miles (100 km²) and an average depth of 18 feet (5.5 m).

The first written history of the area documents a French fort (or fur post) built on its shores. Fort Beauharnois was built in 1727 on lowlands and the fort was rebuilt in 1730 on higher ground.

In 1922, Ralph Samuelson invented the sport of water skiing on the lake. The largest city on the waterfront is Lake City, Minnesota. The wide area of the lake stretches from Bay City, Wisconsin, in the north, down past Pepin, Wisconsin, in the south, with Pepin being just upstream from where the Chippewa River enters the Mississippi. The cities of Maiden Rock and Stockholm also border on the Wisconsin side, while Frontenac State Park takes up a large part of the Minnesota side. There are three marinas on the lake: the Lake City Marina and Hansen's Harbor, both in Lake City, and Dan's Pepin Marina in Pepin, Wisconsin. There is also a private dock for the customers of the Pickle Factory restaurant in Pepin.

Sailboats are common on the lake in summer. In the winter, there are ice roads that cross the lake.

The lake is also supposedly home to a lake monster, which was supposedly seen on April 28, 1871, and has been spotted only rarely since then.