| 词条 | Navigation Structures at Harbor Beach Harbor |
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| name = Navigation Structures at Harbor Beach Harbor | nrhp_type = | image = Harbor Beach MI Harbor.jpg | caption = | location= N. Lakeshore Dr., Harbor Beach, Michigan | coordinates = {{coord|43|50|54|N|82|38|15|W|display=inline,title}} | locmapin = Michigan#USA | built = {{Start date|1873}} | architect = Major G. Weitzel, Charles P. Glibert, | architecture = Utilitarian | added = September 11, 1997 | area = {{convert|5.6|acre}} | refnum = 97000972[1] }} The Navigation Structures at Harbor Beach Harbor are a series of breakwaters located in Lake Huron, on North Lakeshore Drive in Harbor Beach, Michigan. They were listed on the National Register of Historic Places in 1997.[1] HistoryIn the mid-1800s, sailing across Saginaw Bay could be risky, and the nearest refuge from oncoming storm was the mouth of the St. Clair River, 80 miles away. Laker captains requested the construction of a more accessible harbor, and in 1872 this location was chosen.[2] Construction began in 1873. In 1875, a skeletal light tower was put in place to mark the location of the entrance to the partially completed harbor. The current Harbor Beach Light was constructed in 1885. That same year marked the end of breakwater construction; the entire project was completed at a cost of $975,000.[3] In 1903, the wooden breakwaters were found to be deteriorating, and the next year the Army Corps of Engineers began replacing the timber structures above the waterline with a concrete superstructure.[4] The main breakwater was completed by 1909, with the north and south sections following in 1911/12 and 1916/17. Major rehabilitation was performed in the late 1960s / early 1970s, and again in the 1980s.[5] DescriptionThe navigation structures include nearly 7,900 feet of breakwater surrounding the Harbor Beach harbor. The breakwater is constructed of stone-filled cribwork, and is laid in three pieces; with the first running approximately 1500 feet eastward, beginning three-quarters of a mile north of the dock. There is a gap of about 300 feet to the next section of breakwater, which runs approximately 300 feet eastward, 3960 feet southeast, and another 300 feet east. There is a gap of 600 feet for the entrance, followed by the final section of breakwater which runs 1900 feet southward.[3] The inner basin is dredged to a depth of 23 feet.[6] The Harbor Beach Light is located on the breakwater at the mouth of the harbor. The breakwater is capped with concrete.[4] References1. ^1 {{NRISref|version=2010a}} {{National Register of Historic Places}}2. ^{{cite web | title = History of the Harbor Beach Lighthouse | publisher = Harbor Beach Lighthouse | url = https://harborbeachlighthouse.org/history/ | accessdate = December 29, 2017}} 3. ^1 {{cite web | title = Harbor Beach Lighthouse | publisher = Lighthouse Friends | url = http://lighthousefriends.com/light.asp?ID=170 | accessdate = December 29, 2017}} 4. ^1 {{cite web | title = Harbor Beach Lighthouse | publisher = Seeing the Light | url = http://www.terrypepper.com/lights/huron/harbrbeach/harborbeach.htm | accessdate = December 29, 2017}} 5. ^{{citation | title = Case Histories of Corps Breakwater and Jetty Structures: Report 3. North Central Division| author = Robert R. Bottin | publisher = U.S. Army Engineer Waterways Experiment Station | year = 1988 | pages = 294-297}} 6. ^{{citation | title = Harbor Beach Harbor, MI | author = US Army Corps of Engineers | date = February 2012 | url = http://www.lre.usace.army.mil/Portals/69/docs/Navigation/FACTSHEETS2012/Harbor%20Beach%20Harbor.pdf}} 3 : Breakwaters|National Register of Historic Places in Huron County, Michigan|Buildings and structures completed in 1873 |
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