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2. Milwaukee Breakwater Light - Wikipedia

   en.wikipedia.org/wiki/Milwaukee_Breakwater_Light

   Milwaukee Breakwater Light ; Location: Milwaukee, Wisconsin: Coordinates: 1]: Tower; Constructed: 1926: Foundation: Concrete: Construction: 1 ⁄ 4 inch (6.4 mm) steel plate, steel frame, cast iron lantern: Automated: 1966 [2]: Height: 53 feet (16 m) [3]: Shape: Square on square house, topped by round lantern: Markings: white with black lantern & parapet: Heritage: National Register of ...

3. Caisson lighthouse - Wikipedia

   en.wikipedia.org/wiki/Caisson_lighthouse

   A caisson lighthouse (also referred to as a sparkplug lighthouse, or bug light) is a type of lighthouse whose superstructure rests on a concrete or metal caisson. [1] Caisson lighthouses were developed in the late nineteenth century as a cheaper alternative to screwpile lighthouses. The caisson design was also more efficient as it could better ...

4. Milwaukee Pierhead Light - Wikipedia

   en.wikipedia.org/wiki/Milwaukee_Pierhead_Light

   Milwaukee Pierhead Light ; Location: Milwaukee, Wisconsin: Coordinates: 1]: Tower; Constructed: 1872: Foundation: concrete pier: Construction: Steel: Automated: circa 1939: Height: 41 feet (12 m) [2]: Shape: Frustum of a cone, decagonal lantern room: Markings: Red with black lantern and parapet [4]: Heritage: National Register of Historic Places listed place : Light; First lit: 1872: Focal ...

5. Point Arena Light - Wikipedia

   en.wikipedia.org/wiki/Point_Arena_Light

   The United States Lighthouse Board contracted with a San Francisco-based company to build a new lighthouse on the site and specified that it had to withstand earthquakes. The company chose normally built factory smokestacks, which accounts for the final design for the new Point Arena Lighthouse, featuring steel reinforcement rods encased in ...

6. Oswego Harbor West Pierhead Light - Wikipedia

   en.wikipedia.org/wiki/Oswego_Harbor_West...

   Oswego Harbor West Pierhead Lighthouse is an active aid to navigation located off the coast of Oswego, New York. [ 2 ] [ 3 ] It was built in 1934 to replace an earlier light constructed in 1880. It stands at the end of a 2,000-foot-long (610 m) breakwater at mouth of Oswego River , extending one-half mile (0.80 km) out onto Lake Ontario .

7. Conservation and restoration of lighthouses - Wikipedia

   en.wikipedia.org/wiki/Conservation_and...

   Strong winds and waves cause land erosion around lighthouses. Over extended periods of time, the promontories that lighthouses are normally built on can be eroded to the point where the safety of the lighthouse is impacted. In extreme cases, the lighthouse might need to be relocated to a new plot of land in order to preserve the structure.