The Don N. Holt Bridge is a parallel chord, three-span continuous, modified Warren-type

truss bridge A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or ...

that carries

Interstate 526 Interstate 526 (I-526) is a auxiliary route of I-26, providing a partial beltway around Charleston, South Carolina, in the United States. The route serves several purposes, firstly, as a bypass for through traffic on U.S. Route 17 ( ...

(I-526) over the Cooper River between

Charleston Charleston most commonly refers to: * Charleston, South Carolina * Charleston, West Virginia, the state capital * Charleston (dance) Charleston may also refer to: Places Australia * Charleston, South Australia Canada * Charleston, Newfoundlan ...

and

North Charleston North Charleston is the third-largest city in the state of South Carolina.City Planning Department (2008-07)City of North Charleston boundary map. City of North Charleston. Retrieved January 21, 2011. On June 12, 1972, the city of North Charlest ...

. It was built in 1992 by the

South Carolina Department of Transportation The South Carolina Department of Transportation (SCDOT) is a government agency in the US state of South Carolina. Its mission is to build and maintain roads and bridges and administer mass transit services. By state law, the SCDOT's function and ...

and was designed by

HNTB Corporation HNTB Corporation is an American infrastructure design firm. Founded in 1914 in Kansas City, Missouri, HNTB began with the partnership made by Ernest Emmanuel Howard with the firm Waddell & Harrington, founded in 1907. Considered as one of the m ...

. The bridge provides a connection between the communities east of the Cooper River, including Mount Pleasant and

Daniel Island Daniel Island, South Carolina is a island located in the city of Charleston, South Carolina, United States. Named after its former inhabitant, the colonial governor of the Carolinas, Robert Daniell, the island is located in Berkeley County and ...

, to

and

I-26 I26 may refer to: * Interstate 26 Interstate 26 (I-26) is a main route of the Interstate Highway System in the Southeastern United States. Nominally east–west, as indicated by its even number, I-26 runs from the junction of U.S. Route 11W ...

. It is part of a major

hurricane A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...

evacuation route for the area. The Don Holt Bridge is adjacent to a

Kapstone KapStone Paper & Packaging (formerly Stone Arcade Acquisition Corporation) is an American pulp and paper company based in Northbrook, Illinois. It was founded in 2005 as Stone. Since November 2018 it has been a subsidiary of WestRock Company. ...

(formerly

MeadWestvaco MeadWestvaco Corporation was an American packaging company based in Richmond, Virginia. It had approximately 23,000 employees. In February 2006, it moved its corporate headquarters to Richmond. In March 2008, the company announced a change to sta ...

)

paper mill A paper mill is a factory devoted to making paper from vegetable fibres such as wood pulp, old rags, and other ingredients. Prior to the invention and adoption of the Fourdrinier machine and other types of paper machine that use an endless belt, ...

. In the mid 1980s, prior to construction of the bridge, owners of the mill filed a lawsuit to stop the bridge because the

bridge deck A deck is the surface of a bridge. A structural element of its superstructure, it may be constructed of concrete, steel, open grating, or wood. Sometimes the deck is covered by a railroad bed and track, asphalt concrete, or other form of pa ...

would be at the same height as smokestacks from the mill. In certain weather conditions, the smokestacks produce a fog which could blind drivers and place the mill at risk for lawsuits from drivers. The lawsuit was settled by mandating that a

road weather information system A Road Weather Information System (RWIS) comprises automatic weather stations (AWS) (often technically referred to as Environmental Sensor Stations (ESS) as they also cover non-meteorological variables) in the field, a communication system for dat ...

(RWIS) be included in the bridge project. The RWIS was designed to detect reduced visibility on the bridge and "to inform drivers of dense fog conditions, reduce traffic speeds, and guide vehicles safely through the fog-prone area." The system uses

variable-message sign A variable- (also changeable-, electronic-, or dynamic-) message sign, often abbreviated VMS, CMS, or DMS, and in the UK known as a matrix sign, is an electronic traffic sign often used on roadways to give travelers information about special ...

s and illuminating pavement lights (similar to a runway centerline lighting system). As of May 2003, there were no fog-related crashes. The bridge was named for Don N. Holt who served in the

South Carolina House of Representatives The South Carolina House of Representatives is the lower house of the South Carolina General Assembly. It consists of 124 representatives elected to two-year terms at the same time as U.S. congressional elections. Unlike many legislatures, seati ...

and was in the insurance business.Concurrent Resolution
of the

South Carolina General Assembly The South Carolina General Assembly, also called the South Carolina Legislature, is the state legislature of the U.S. state of South Carolina. The legislature is bicameral and consists of the lower South Carolina House of Representatives and t ...

References

Cornell University Case Study of the Don Holt Bridge

Map showing boundaries of City of Charleston
{{Crossings navbox , structure = Crossings , place = Cooper River , bridge = Don N. Holt Bridge , bridge signs = I-526

, upstream =

CSX CSX Transportation , known colloquially as simply CSX, is a Class I freight railroad operating in the Eastern United States and the Canadian provinces of Ontario and Quebec. The railroad operates approximately 21,000 route miles () of track. ...

railroad Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...

Cordesville

swing bridge A swing bridge (or swing span bridge) is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pi ...

, upstream signs = , downstream =

Arthur Ravenel Jr. Bridge The Arthur Ravenel Jr. Bridge (also known as the Ravenel Bridge and the Cooper River Bridge) is a cable-stayed bridge over the Cooper River in South Carolina, US, connecting downtown Charleston to Mount Pleasant. The bridge has a main span ...

, downstream signs = US 17

Continuous truss bridges in the United States

Holt Holt or holte may refer to: Natural world *Holt (den), an otter den * Holt, an area of woodland Places Australia * Holt, Australian Capital Territory * Division of Holt, an electoral district in the Australian House of Representatives in Vic ...

Bridges in North Charleston, South Carolina Bridges completed in 1992 Road bridges in South Carolina Interstate 26 Bridges on the Interstate Highway System Warren truss bridges in the United States

See also

References