Washington topographic map

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A system of seventeen locks connects Lake Winnebago to Lake Michigan at Green Bay, an elevation drop of about 150 feet (45 m). This lock system is located along the lower Fox River and starts at the northwest corner of Lake Winnebago in the city of Menasha and ends at the mouth of Green Bay. One of the locks,…

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Marquette County lies in central Wisconsin’s glaciated lowland-and-moraine country, where a generally subdued landscape is broken by sandy outwash plains, wet basins, lake margins, and low ridges left by Ice Age ice and meltwater. Elevations are modest but varied, from the broad, lower wetlands and waterways…

Average elevation: 850 ft

Average elevation: 971 ft

Rock Island is a mostly wooded island off the tip of Wisconsin's Door Peninsula at the mouth of Green Bay, in Door County, Wisconsin. The 974.87-acre (394.5 ha) island is approximately 1.6 miles (2.6 km) long and 1.1 miles (1.8 km) wide. It rises to 65 meters above Lake Michigan, making it the highest in…

Average elevation: 617 ft

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The uppermost lock and dam on the Upper Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is 799 feet (244 m). Below the dam, the river's elevation is 750 feet (230 m). This 49-foot (15 m) drop is the largest of all the Mississippi River locks…

Average elevation: 666 ft

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Jefferson's elevation is 797 ft (243 m) at the center of downtown.

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