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The Sonestown Covered Bridge is a Burr arch truss covered bridge over Muncy Creek in Davidson Township, Sullivan County, in the U.S. state of Pennsylvania. Built c. 1850, the bridge is long, and was placed on the National Register of Historic Places (NRHP) in 1980.〔 ''Note:'' This includes 〕 The bridge is named for the nearby unincorporated village of Sonestown in Davidson Township, and is also known as the Davidson Covered Bridge. It was built to provide access to a gristmill, which operated until the early 20th century. Pennsylvania had the first covered bridge in the United States and the most such bridges in the 19th, 20th, and 21st centuries. In most places in the state they were a transition between stone and metal bridges, with the roof and sides protecting the wooden structure from weather. The Sonestown bridge is a Burr arch truss type, with a load-bearing arch sandwiching multiple vertical king posts, for strength and rigidity. The bridge construction is cruder than the other two surviving covered bridges in Sullivan County, with each Burr arch formed from six straight beams set at angles instead of a smooth curve. The bridge was repaired c. 1969, and after flood damage in 1996, 2005, and 2013. It was also restored in 2001. Despite the repairs and restoration, as of 2012 the bridge structure's sufficiency rating on the National Bridge Inventory was only 19.0 percent and its condition was deemed "Structurally deficient" (the bridge was also closed in 2012, awaiting repair).〔 It is the shortest covered bridge in the county and as of 2015 is still in use, with average daily traffic of 50 vehicles in 2010. ==Overview== The covered bridge crosses Muncy Creek in Davidson Township on Champion Hill Road (Township Road 310), just east of U.S. Route 220. The village of Sonestown is north of the bridge on Route 220 and has given the Sonestown Covered Bridge its name.〔 The bridge is also east of the village of Muncy Valley along Route 220. Its official name on the NRHP is Sonestown Covered Bridge.〔 It is also known as the Davidson Covered Bridge, for its township.〔 Sullivan County is located in north central Pennsylvania, about northwest of Philadelphia and east-northeast of Pittsburgh. The area that became Davidson Township was first settled in 1806 and was incorporated as a township in 1833.〔 ''Note'': Davidson Township was formed in 1833 from part of Shrewsbury Township while both were still part of Lycoming County.〕 Within the township, George Sones built a sawmill and founded the unincorporated village of Sonestown in 1843.〔 All of these events occurred before Sullivan County was formed from part of Lycoming County on March 14, 1847.〔 The bridge was built in 1850, and in the late 19th century Sonestown "boomed like crazy" as the lumber industry grew in Sullivan County. The village was then home to a plant that manufactured the staves for making barrels. It had a clothespin factory from 1903 to 1929 but lost almost all industry by the 1930s. As of 1996, Sonestown had a population of about 200, most of whom commuted to work in Muncy, Montoursville, and Williamsport. In 1996 the village had a few stores, an inn with a restaurant, and attracted tourists and hunters.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sonestown Covered Bridge」の詳細全文を読む スポンサード リンク
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