Rockland Breakwater

Ruwan Rockland Breakwater shine matsugunin ruwa da ke garkuwa da tashar jiragen ruwa na Rockland, Maine . Fiye da  tsawo, an gina shi a cikin 1890s ta Rundunar Sojojin Amurka na Injiniya daga cikin granite na cikin gida don inganta ikon tashar jiragen ruwa na kare jiragen ruwa daga hadari na bakin teku. An jera shi a cikin National Register of Historic Places a 2003. 

 Bayani da tarihi 
Birnin Rockland yana gefen yamma na Penobscot Bay a yankin Maine na Mid Coast . Tashar ruwanta, wacce aka dade ana daukarta a matsayin daya daga cikin mafi kyawun gabas na Portland, ana yawan amfani da ita a karni na 19 a matsayin tashar jiragen ruwa mai aminci yayin mummunan yanayi. Bai fi dacewa da wannan aikin ba, saboda babban buɗewar da yake fuskanta ta gabas har yanzu zai sa jiragen ruwa su tsaya ga guguwa da iska daga arewa maso gabas . Manyan guguwa a cikin shekarun 1850 sun nuna bukatar ingantacciyar kariyar tashar jiragen ruwa, amma ba a amince da kudaden tarayya na aikin ba sai 1880. Tsakanin 1880 da 1900 Rundunar Sojojin Amurka na Injiniya, a ƙarƙashin jerin abubuwan da suka dace na Majalisar Wakilai, sun gina ruwa. An ƙara hasken da ke tsaye a ƙarshensa a cikin 1902. 
link=//upload.wikimedia.org/wikipedia/commons/thumb/1/19/Rockland_breakwater.JPG/300px-Rockland_breakwater.JPG|right|thumb|300x300px| Duba ga fitilun daga bakin gaɓa.
Ruwan ruwan ya faɗo kudu daga Jameson Point (wanda ke nuna alamar arewacin bakin tashar jiragen ruwa), kuma yana da tsayin  . An gina shi daga granite da aka sassaƙa a cikin gida, kuma yana da ɓangaren giciye na trapezoidal, fuskarta ta gefen teku tana juyewa a hankali fiye da gefen tashar jiragen ruwa, domin ya fi dacewa da ɗaukar igiyoyin ruwa. saman ruwan karya yana da kusan  fadi, yayin da gindinsa na karkashin ruwa ya kai kimanin  fadi. Saman da ake iya gani yana samuwa ne daga ginshiƙan granite. An yi amfani da kusan tan 700,000 na dutse wajen gina shi. An yi imanin cewa ruwan karyewar ruwan ya zama na musamman a tsakanin rundunonin Sojoji na karni na 19 a cikin amfani da kayan gida na musamman. 

 Duba kuma 

 Rajista na Kasa na Lissafin Wuraren Tarihi a cikin Knox County, Maine

 Manazarta