Mid-Hudson Bridge
Coordinates: 41 ° 42 ′ 11 ″ N , 73 ° 56 ′ 46 ″ W.
| Mid-Hudson Bridge | ||
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| Official name | Franklin D. Roosevelt Mid-Hudson Bridge | |
| use | Road bridge | |
| Convicted |
  US Highway 44, US Highway 55
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| Crossing of | Hudson River | |
| place | Poughkeepsie, NY | |
| construction | Suspension bridge | |
| overall length | 914.4 m | |
| Longest span | 457.2 m | |
| Clear height | 41.1 m | |
| start of building | 1925 | |
| completion | 1930 | |
| planner | Ralph Modjeski | |
| toll | toll | |
| location | ||
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The Mid-Hudson Bridge is a road bridge Poughkeepsie in the US state of New York with the Ulster County on the west side of the Hudson River connecting and US Highways 44 and 55 over the river.
Location, name
When the decision to build the Mid-Hudson Bridge was decided in 1923, the Bear Mountain Bridge and the Holland Tunnel were already under construction, but south of Albany there was only the Poughkeepsie Bridge , a railway bridge, but no road bridge over the Hudson River. The future bridge was to be halfway between Albany and the Hudson Estuary in New York City , around 870 m below the Poughkeepsie Bridge.
Since 1994 its official name has been Franklin D. Roosevelt Mid-Hudson Bridge after President Franklin D. Roosevelt , who, as Governor of New York and resident of Poughkeepsie, opened the bridge with his wife Eleanor on August 25, 1930.
description
The Mid-Hudson Bridge is a suspension bridge with originally two lanes , which was redesigned to three lanes in 1988, with the middle strip normally closed, but during rush hour it serves the heavier traffic in alternating directions. On the north side facing Poughkeepsie Bridge, a pedestrian walkway was added to the outside of the bridge.
The bridge structure was designed by Ralph Modjeski . It is 914.4 m (3000 ft ) long between the anchor blocks ; the span between the pylons standing in the river is 457.2 m (1500 ft). The bridge has a clearance height of 41.1 m (135 ft) above MHW , a height measure that was originally set by the Brooklyn Bridge and has since applied to most bridges in the wider area.
The slender steel pylons are characterized by their neo-Gothic shape corresponding to the time. The stems are reinforced by buttresses arranged on the side, which only merge with the stems far above the deck girder. The transitions between the stems and the cross stiffeners made of horizontal and diagonal steel girders were rounded off to achieve a more pleasing appearance. A lath framework was built in between the top transverse stiffeners, which serves the appearance rather than the structural requirements. The pylons are 96 m (315 ft) high and stand on granite-clad concrete foundations that were established with the help of caissons on the rocky floor under the river bed. One of the caissons fell during the lowering of the solder ; it took two years to erect again, which explains the seemingly long construction time.
The deck girder consists of a steel lattice trough open at the top , in which the 11 m (36 ft) wide deck is arranged between the high lattice girders. The two 40.6 cm thick suspension cables run above the truss. They each consist of 6080 individual wires that have been processed into parallel wire ropes using the air-jet spinning process .
In 1983 the American Society of Civil Engineers declared the Mid-Hudson Bridge a New York State Historic Civil Engineering Landmark .
Web links
- The “Franklin D. Roosevelt” Mid-Hudson Bridge on the New York State Bridge Authority website
- Mid-Hudson Bridge Historic Overview on NYCroads
Individual evidence
- ↑ Only the Verrazzano-Narrows Bridge over the harbor entrance and the Throgs Neck Bridge are higher.