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London Tower Bridge

London Tower Bridge. First Moveable Bridge Across Thames 1894 Span - 800 feet. Chesapeake Bay Bridge-Tunnel. Total Length - 17.5 miles Two Mile-Long Tunnels Aircraft Carriers, Tankers, Etc. Tunnels. Orwigsburg (1821) - Auburn, Penn 450 feet - First In US

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London Tower Bridge

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  1. London Tower Bridge • First Moveable Bridge Across Thames • 1894 • Span - 800 feet

  2. Chesapeake Bay Bridge-Tunnel • Total Length - 17.5 miles • Two Mile-Long Tunnels • Aircraft Carriers, Tankers, Etc.

  3. Tunnels • Orwigsburg (1821) - Auburn, Penn • 450 feet - First In US • Mont Cenis (1871) - France To Italy • 8.5 miles - First Railroad Tunnel • Simplon (1922) - Switzerland To Italy • 12.3 miles - “Most Famous In World” • New York Tunnels • Holland (1927), Lincoln (37,45,57) • Channel Tunnel (1993 ?) • 21 miles

  4. Dams • Types • Gravity, Arch, Butress, Embankment • Combined Types • Egypt - 4000 BC • Nile River - City of Memphis • Grand Coulee Dam • Hoover Dam • Aswan High Dam

  5. Grand Coulee Dam (1933-42) • Washington Lead States in Hydroelectric Power • Gravity Dam - Columbia River • 550 feet High, 4172 feet Long • 6.5 Million kW by 1980

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