Hill to Hill Bridge

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Hill to Hill Bridge
PA 378 on the Hill to Hill.jpg
Hill to Hill Bridge heading northbound in October 2005
Coordinates 40°36′56″N75°23′05″W / 40.6155°N 75.3846°W / 40.6155; -75.3846
Carries4 lanes of PA-378.svg PA 378 and 2 sidewalks
Crosses Lehigh River
Locale Bethlehem, Pennsylvania, U.S.
Official nameHill to Hill Bridge
Other name(s)Route 378 Bridge
Characteristics
Design concrete arch truss bridge
History
Opened1924
Statistics
TollFree
Location
Hill to Hill Bridge

The Hill to Hill Bridge is a road crossing of the Lehigh River and linking the south and north sides of Bethlehem, Pennsylvania in the Lehigh Valley region of eastern Pennsylvania.

Contents

Completed in 1924, Hill to Hill Bridge carries Pennsylvania Route 378 from Wyandotte Street on Bethlehem's south side to a series of ramps and viaducts on the north side. It replaced a two-lane covered bridge and eliminated several grade crossings of three railroads on the two banks of the Lehigh River. The Hill to Hill Bridge is located in the Central Bethlehem Historic District and was added to the National Register of Historic Places in 1972 with a boundary increase to the designation added in 1988. [1]

History

1906 photograph of the old bridge, which was replaced in September 1924 with the opening of Hill to Hill Bridge, which crosses the Lehigh River and connects the north and south sides of Bethlehem Old Bridge, Bethlehem, Pennsylvania postcard photograph from 1906.JPG
1906 photograph of the old bridge, which was replaced in September 1924 with the opening of Hill to Hill Bridge, which crosses the Lehigh River and connects the north and south sides of Bethlehem
Hill to Hill Bridge in Bethlehem, September 2013 Hill to Hill Bridge, Bethlehem PA 02.JPG
Hill to Hill Bridge in Bethlehem, September 2013

Early history

Prior to Bethlehem's incorporation as a city in 1917, the north side and the south side were independent municipalities. During the latter part of the 1910s, three bridges crossed between Bethlehem and South Bethlehem: the Minsi Trail bridge, the New Street bridge, and the Main Street covered bridge. The Main Street bridge was narrow and was regularly damaged by floods and ice. It crossed several tracks of the Lehigh Valley Railroad and the Reading Railroad on the south side as it led to Wyandotte Street. The Pacific Hotel stood between the southern portal to the covered bridge; the adjacent image shows the active freight and passenger railroad tracks travelers crossed to reach the bridge. To the right (not visible) was Union Station (or Union Depot), the passenger station of the Lehigh Valley and Reading Railroads with service to Buffalo Harrisburg, New York City at Jersey City, New Jersey, and Philadelphia.

On the north side, it crossed the Lehigh Canal and the tracks of the Central Railroad of New Jersey before continuing up Seminary Hill, named for the Moravian Church's Female Seminary, to the Main Street business district.

Construction

Community leaders found the covered bridge to be a barrier to commerce between "the Bethlehems". As a result of the consolidation of the two municipalities into a single city, sufficient resources became available to design and construct a new bridge connecting Fountain Hill and Seminary Hill.

By 1921, a commission was in place to design and oversee the construction of the new Lehigh River span. Commission members were the city's first mayor, Archibald Johnston (chairman), J.S. Krause (vice-chairman), G.H. Blakeley, O.L. Henninger (representing Lehigh County), A.A. Woodring (representing Northampton County), A. Geo. Shoffner (secretary), Dallett H. Wilson (counsel) and C.W. Hudson (engineer). [2]

Construction on the Hill to Hill Bridge began on August 1, 1921, after many previous plans. As constructed, the bridge had nine approaches, eleven abutments, forty-eight piers, and fifty-eight spans. It was considered an engineering marvel of its time. By September 1924, the bridge was complete and opened by mayor James Yeakel and provided safe, grade-separated connections between the two halves of the city.

Modernization

The structure of the Hill to Hill Bridge was modified significantly during the years after World War II. The first significant change to traffic on the bridge came during the construction of the expressway portion of PA Route 378 north of the bridge, known locally as the Spur Route. Initially, the Second Avenue ramp on the north side was closed in 1967. In 1968, the expressway portion was opened.

Three other ramps were removed as part of safety, structural, and redevelopment efforts. On the north side, the South Main Street ramp leading to Lehigh Street and the industrial area along Monocacy Creek was removed in 1965. The River Street ramp leading to Sand Island was removed in 1988. On the south side, the Second Street ramp was removed in 1989. [3]

The bridge saw extensive repairs in 1990, and was painted in spring of 2009. The painting process had caused two of the four traffic lanes to be closed, and had resulted in major traffic congestion. The painting project was finished in time for the opening of the Sands Casino Resort Bethlehem, which was later renamed Wind Creek Bethlehem after its acquisition by Wind Creek Hospitality.

Bridge structure

The bridge is noted for its many ramps and branches. It was designed by Clarence W. Hudson and its structure makes use of "a combination of steel through truss and concrete closed spandrel deck arch spans" [3] A unique characteristic of the bridge was the design of the two truss spans, needed to provide clearance over the railroads. Because the Second Street ramp intersected the bridge at the point of the southern truss span, the normal diagonal trusses could not be included. Engineer C.W. Hudson designed an alternative truss configuration, now known as the Hudson truss, which allowed an opening in the truss web between its vertical members. [3] This bridge's spans are the only known examples of this truss configuration.

1924 (original) ramps and overcrossings from south to north

Sketch schematic of Hill-to-Hill Bridge approaches and overcrossings as of opening date in 1924. Hill-to-Hill Bridge 1924.jpg
Sketch schematic of Hill-to-Hill Bridge approaches and overcrossings as of opening date in 1924.

Current ramps and overcrossings from south to north

Hill-to-Hill Bridge, Bethlehem, Pennsylvania in December 2014 OSM Hill to Hill Bridge in 2014.tiff
Hill-to-Hill Bridge, Bethlehem, Pennsylvania in December 2014

See also

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References

  1. "National Register Information System". National Register of Historic Places . National Park Service. July 9, 2010.
  2. Keim, R.R. (1924). The Hill-to-Hill Bridge [of] Bethlehem, Pennsylvania. Bethlehem, Pennsylvania: Times Publishing Company. p. 21.
  3. 1 2 3 "Hill to Hill Bridge - Historicbridges.org". Historic Bridges Bridge Browser. Retrieved December 5, 2014.
  4. Keim, R.R. (1924). The Hill-to-Hill Bridge [of] Bethlehem, Pennsylvania. Bethlehem, Pennsylvania: Times Publishing Company.