America's Most Famous Bodies of Water: Great Lakes, Mighty Rivers, and Iconic Coasts

The Great Lakes: Inland Seas

World's largest freshwater system (21% of Earth's surface fresh water):

• Lake Superior: Largest by area (31,700 mi²), deepest (1,333 ft), coldest
• Lake Huron: Longest shoreline (3,827 mi incl. islands), Manitoulin Island
• Lake Michigan: Only entirely in US; Chicago, Milwaukee, dunes
• Lake Erie: Shallowest, warmest, most productive fishery, Niagara Falls outlet
• Lake Ontario: Smallest, deepest average, St. Lawrence outlet to Atlantic

Connected by Straits of Mackinac, Detroit/St. Clair Rivers, Niagara River, Welland Canal, St. Lawrence Seaway.

Major River Systems

Mississippi River

• 2,340 miles (3,766 km) — Minnesota to Gulf of Mexico
• Drains 41% of contiguous US (1.2M mi² watershed)
• Tributaries: Missouri (longest), Ohio (largest volume), Arkansas, Red River
• Commercial: 500M+ tons/year (grain, coal, petroleum, chemicals)

Colorado River

• 1,450 miles — Rockies to Gulf of California (rarely reaches sea now)
• Carves Grand Canyon; 40M people depend on its water
• Dams: Hoover (Lake Mead), Glen Canyon (Lake Powell), Parker, Davis, Imperial
• Law of the River: 1922 Compact + amendments — overallocated

Hudson River

• 315 miles — Adirondacks to NYC Harbor
• Tidal estuary to Troy, NY (150 mi inland)
• Historic: Erie Canal connection, Revolutionary War, Hudson River School art
• PCB cleanup (GE, 1947-77) — ongoing restoration

Columbia River

• 1,243 miles — Canadian Rockies to Pacific
• Hydroelectric giant: 14 mainstem dams (Grand Coulee = 6.8 GW)
• Salmon migration (endangered), Hanford nuclear legacy

Iconic Coastal and Estuarine Waters

• Chesapeake Bay: Largest US estuary (64,000 mi² watershed), blue crab, oyster, striped bass, naval hub (Norfolk)
• San Francisco Bay: 1,600 mi², Golden Gate, Alcatraz, delta, seismic risk
• Puget Sound: Fjord system, orcas, ferries, Port of Seattle/Tacoma
• Long Island Sound: 1,300 mi², NYC suburb playground, hypoxia challenges

Unique Water Bodies

• Great Salt Lake: Terminal saline lake (3-5x ocean salinity), shrinking
• Crater Lake: Deepest US (1,943 ft), volcanic caldera, intense blue
• Lake Tahoe: Alpine clarity (70 ft Secchi), CA/NV border, ski mecca
• Everglades: "River of Grass" — slow sheet flow, sawgrass, gators, panthers