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''Also note'': This incorrectly identifies the bridge as being in Elkland Township.〕 | width_type = | number = | number_type = | height_imperial = 8.0 | height_round = 1 | height_type = Clearance | height_note = | depth_imperial = | volume_imperial = | area_imperial = | style_type = Design | style = Burr arch truss bridge | material = Wood | author_type = Builder | author = Sadler Rodgers | established_type = Built | established = c. 1850 | established_note = | established1_type = Restored | established1 = 1963, 2010, 2012 | management_type = Owned and Maintained by | management = Sullivan County | code_type = NBI Number | code_label = National Bridge Inventory identification number | code = 567207035700040 | code_note =〔 ''Note'': this is a formatted scrape of the 2012 official website, which can be found here for Pennsylvania: . The 2006 NBI for Pennsylvania is here (PA06.txt )〕 | code1_type = WGCB Number | code1_label = World Guide to Covered Bridges Number | code1 = 38-57-02 | code1_note = | public = | visitation = | visitation_date = | access = | access_type = | whs_name = | whs_year = | whs_number = | whs_region = | whs_criteria = | iucn_category = | free_type = Load | free = 3 tons (2.7 t) | free1_type = Added to NRHP | free1 = July 2, 1973 | free2_type = NRHP Ref# | free2 = 73001666 | free3_type = MPS | free3 = Covered Bridges of Bradford, Sullivan and Lycoming Counties TR | map = Pennsylvania Locator Map.PNG | map_size = 300 | map_caption = Location of the Hillsgrove Covered Bridge in Pennsylvania | map_locator = Pennsylvania | map1 = Map of USA PA.svg | map1_size = 300 | map1_caption = Location of Pennsylvania in the United States | commons = Hillsgrove Covered Bridge | statistics = | website = | footnotes = }} The Hillsgrove Covered Bridge is a Burr arch truss covered bridge over Loyalsock Creek in Hillsgrove Township, Sullivan County, in the U.S. state of Pennsylvania. It was built c. 1850 and is long. In 1973, it became the first covered bridge in the county to be placed on the National Register of Historic Places (NRHP). The bridge is named for the township and nearby unincorporated village of Hillsgrove, and is also known as Rinkers Covered Bridge for an adjoining farm. Pennsylvania had the first covered bridge in the United States, and has had the most such bridges since the 19th century. They were a transition between stone and metal bridges, with the roof and sides protecting the wooden structure from the weather. The Hillsgrove bridge has load-bearing Burr arches sandwiching multiple vertical king posts on each side, for strength and rigidity. It was built by Sadler Rodgers, who also constructed the nearby Forksville Covered Bridge in the same year, with a similar design. The Hillsgrove bridge is the longest of three covered bridges remaining in Sullivan County, and served as a landing site for lumber rafts on the creek between 1870 and 1890. Nineteenth-century regulations restricting speed, number of animals, and fire are still posted on the bridge. Restoration work was carried out in 1963, 1968, 2010, and again in 2012 after serious flood damage. The bridge is still in use, with average daily traffic of 54 vehicles in 2012. Despite these restorations, it had a "structurally deficient" rating in the 2012 National Bridge Inventory, with a 16.5 percent structural sufficiency rating.〔 ==Overview== The covered bridge is in Hillsgrove Township on Covered Bridge Road (Township Road 357), which is north of Pennsylvania Route 87 via Splash Dam Road (TR 359). The bridge crosses Loyalsock Creek northeast and upstream of the unincorporated village of Hillsgrove,〔 and is just south of Elkland Township.〔 Its official name on the NRHP is ''Hillsgrove Covered Bridge''.〔 It is also known as Rinkers Covered Bridge for the Rinker farm, which is located at the east end of the bridge.〔 Sullivan County is located in north central Pennsylvania, about northwest of Philadelphia and east-northeast of Pittsburgh. The village of Hillsgrove is where Daniel Ogden became the first settler in what is now Sullivan County, c. 1786. John Hill, who founded and named the village of Hill's Grove (later just Hillsgrove), came to the area in 1789 and bought Ogden's land about 1794. Sullivan County was formed from part of Lycoming County on March 14, 1847, and the bridge was built in 1850. The division of Lycoming County ran through Plunketts Creek Township, so there were initially townships of this name in each of the adjoining counties. To avoid confusion, the name of the Sullivan County township was changed to Hillsgrove Township in 1856; the new township name was taken from the village of Hillsgrove, which was (and is) its largest settlement. Hillsgrove Covered Bridge is named for its township and the nearby village, and gave its name to a nearby one-room school known as the Bridge View School.〔 ''Note'': This source also claims the surviving Hillsgrove Covered Bridge was built by Sadler Rogers in 1881.〕 The name Hillsgrove Covered Bridge can also refer to a now vanished covered bridge, also over Loyalsock Creek, but in the village of Hillsgrove. This stood from 1876 until 1934, when it was condemned and replaced by a steel and concrete structure. It was the third covered bridge on the site: the first fell into the creek, and the second was torn down to make way for the third bridge.〔 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「Hillsgrove Covered Bridge」の詳細全文を読む スポンサード リンク
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