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2. North Manitou Shoal Light Station - Wikipedia

   en.wikipedia.org/wiki/North_Manitou_Shoal_Light...

   The North Manitou Shoal Light Station is a white square steel structure atop a concrete crib. [1] The crib measures 65 feet (20 m) on a side, and supports a 62 feet (19 m) square superstructure rising 20 feet (6.1 m) above the water. [5] A two-story steel building 37 feet (11 m) square, containing diesel generators and living quarters, [3] sits ...

3. Lansing Shoals Light Station - Wikipedia

   en.wikipedia.org/wiki/Lansing_Shoals_Light_Station

   Lansing Shoals Light Station. /  45.90333°N 85.56167°W  / 45.90333; -85.56167. The Lansing Shoals Light Station is a lighthouse located in northeastern Lake Michigan, 6.3 miles (10.1 km) southeast of Point Patterson, in Newton Township, Mackinac County, Michigan. It was listed on the National Register of Historic Places in 2005.

4. Martin Reef Light Station - Wikipedia

   en.wikipedia.org/wiki/Martin_Reef_Light_Station

   Martin Reef Light Station. /  45.91333°N 84.14833°W  / 45.91333; -84.14833. The Martin Reef Light Station is a lighthouse located in northern Lake Huron, 4.3 miles (6.9 km) south of Cadogan Point in Clark Township, Michigan. [6] It was listed on the National Register of Historic Places in 2005.

5. Water cribs in Chicago - Wikipedia

   en.wikipedia.org/wiki/Water_cribs_in_Chicago

   The Dunne Crib is situated 50 feet (15 m) from the 68th Street Crib and accessible by a steel footbridge, allowing one set of keepers to service both cribs. [10] [11] [12] During the construction of the tunnel to the Edward F. Dunne Crib, a temporary crib known as the Intermediate Crib was built along the tunnel route, 7,500 feet (2,300 m) from ...

6. Redridge Steel Dam - Wikipedia

   en.wikipedia.org/wiki/Redridge_Steel_Dam

   The Redridge Steel Dam is a steel dam across the Salmon Trout River in Redridge, Houghton County, Michigan. Completed in 1901, it is a flat slab buttress dam constructed of steel, a relatively rare material for construction of dams, which are typically made of earthenworks, concrete, or masonry. Most sources indicate that it was one of only ...

7. Dam - Wikipedia

   en.wikipedia.org/wiki/Dam

   Redridge Steel Dam, built 1905, Michigan. A steel dam is a type of dam briefly experimented with around the start of the 20th century which uses steel plating (at an angle) and load-bearing beams as the structure. Intended as permanent structures, steel dams were an (failed) experiment to determine if a construction technique could be devised ...