Casco Bay Bridge: Difference between revisions
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==Design== |
==Design== |
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[[Image:Million Dollar Bridge (Maine).jpg|thumb|left|Casco Bay Bridge under construction. The span is much larger than its predecessor]] |
[[Image:Million Dollar Bridge (Maine).jpg|thumb|left|Casco Bay Bridge under construction. The span is much larger than its predecessor]] |
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The new Casco Bay Bridge has four 12 foot (3.7 m) wide lanes, with an enclosed walking/jogging lane on its eastern side.<ref name=autogenerated1>[http://www.modjeski.com/projects/servproj/PSP.htm Portland-South Portland<!-- Bot generated title -->]</ref> The bridge is supported by several 7 foot (2.1m meter) thick concrete H-pile cylinders, which the bridge's steel girders sit atop.<ref>http://www.modernsteel.com/Uploads/Issues/July_2000/0007_04_cascobay.pdf</ref> The new bridge has much higher horizontal and vertical clearances, which allow larger ships access further into the [[Fore River]], with the bascule also having to open less frequently. Extra precautions were taken to ensure that the bridge had sufficient pier protection (during construction to the bridge, the existing Million Dollar Bridge was struck at its piers by the oil tanker ''[[Julie N.]]'', which spilled |
The new Casco Bay Bridge has four 12 foot (3.7 m) wide lanes, with an enclosed walking/jogging lane on its eastern side.<ref name=autogenerated1>[http://www.modjeski.com/projects/servproj/PSP.htm Portland-South Portland<!-- Bot generated title -->]</ref> The bridge is supported by several 7 foot (2.1m meter) thick concrete H-pile cylinders, which the bridge's steel girders sit atop.<ref>http://www.modernsteel.com/Uploads/Issues/July_2000/0007_04_cascobay.pdf</ref> The new bridge has much higher horizontal and vertical clearances, which allow larger ships access further into the [[Fore River]], with the bascule also having to open less frequently. Extra precautions were taken to ensure that the bridge had sufficient pier protection (during construction to the bridge, the existing Million Dollar Bridge was struck at its piers by the oil tanker ''[[Julie N.]]'', which spilled over 200,000 barrels (27800 tonnes) of heating oil into Casco Bay). The bridge's steelwork was painted red in order to make it aesthetically pleasing. |
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The final cost for the Casco Bay Bridge was 130 million dollars, making it the largest project undertaken by the Maine Department of Transportation at the time.<ref name=autogenerated1 /> |
The final cost for the Casco Bay Bridge was 130 million dollars, making it the largest project undertaken by the Maine Department of Transportation at the time.<ref name=autogenerated1 /> |
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Revision as of 00:13, 4 December 2009
Casco Bay Bridge | |
|---|---|
 | |
| Coordinates | 43°38′41″N 70°15′24″W / 43.644647°N 70.25656°W |
| Carries | Motor vehicles and pedestrians |
| Crosses | Fore River |
| Locale | Portland, Maine |
| Characteristics | |
| Design | Multi-Girder Bascule |
| Total length | 4,748 feet (1447.2 m) |
| Longest span | 285 feet (86.9 m) at movable span |
| Clearance below | 65 feet (19.8 m) |
| History | |
| Opened | August 1997 |
| Statistics | |
| Daily traffic | 32,000+ vehicles per day |
| Location | |
 | |
The Casco Bay Bridge is a bascule bridge that spans the Fore River connecting South Portland and Portland, Maine, USA.
History
In 1987, the state of Maine in concert with surrounding towns concluded that the existing Million Dollar Bridge, which was almost 70 years old, was inadequate for current needs. This bridge, also a draw bridge, had only two traffic lanes and offered severely limited clearances for maritime traffic. Given increases in tanker commerce and increased usage of the bridge, a replacement was decided on, and construction started in 1993. The Casco Bay Bridge was completed in 1997.
Design
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The new Casco Bay Bridge has four 12 foot (3.7 m) wide lanes, with an enclosed walking/jogging lane on its eastern side.[1] The bridge is supported by several 7 foot (2.1m meter) thick concrete H-pile cylinders, which the bridge's steel girders sit atop.[2] The new bridge has much higher horizontal and vertical clearances, which allow larger ships access further into the Fore River, with the bascule also having to open less frequently. Extra precautions were taken to ensure that the bridge had sufficient pier protection (during construction to the bridge, the existing Million Dollar Bridge was struck at its piers by the oil tanker Julie N., which spilled over 200,000 barrels (27800 tonnes) of heating oil into Casco Bay). The bridge's steelwork was painted red in order to make it aesthetically pleasing.
The final cost for the Casco Bay Bridge was 130 million dollars, making it the largest project undertaken by the Maine Department of Transportation at the time.[1]