The Chesapeake Bay Bridge-Tunnel (CBBT) is a 23-mile (37 km) fixed link crossing at the mouth of the Chesapeake Bay in the U.S. state of Virginia. It connects Northampton County on the Delmarva Peninsula with Virginia Beach, which is part of the Hampton Roads metropolitan area. The bridge-tunnel originally combined 12 miles (19 km) of trestle, two 1-mile-long (1.6 km) tunnels, four artificial islands, four high-level bridges, approximately 2 miles (3.2 km) of causeway, and 5.5 miles (8.9 km) of approach roads--crossing the Chesapeake Bay and preserving traffic on the Thimble Shoals and Chesapeake shipping channels. It replaced vehicle ferry services that operated from South Hampton Roads and from the Virginia Peninsula from the 1930s. Financed by toll revenue bonds, the bridge-tunnel was opened on April 15, 1964, and remains one of only ten bridge-tunnel systems in the world, three of which are located in Hampton Roads, Virginia.
Since it opened, the Chesapeake Bay Bridge-Tunnel has been crossed by more than 100 million vehicles. The CBBT complex carries U.S. Route 13, the main north-south highway on Virginia's Eastern Shore, and, as part of the East Coast's longstanding Ocean Highway, provides the only direct link between the Eastern Shore and South Hampton Roads regions, as well as an alternate route to link the Northeast and points in between with Norfolk and the Carolinas. The bridge-tunnel saves motorists 95 miles (153 km) and 1 1/2 hours on a trip between Virginia Beach/Norfolk and points north and east of the Delaware Valley without going through the traffic congestion in the Baltimore-Washington Metropolitan Area. The $15 toll is partially offset by some savings of tolls in Maryland and Delaware on I-95. From 1995 to 1999, at a cost of almost $200 million, the capacity of the above-water portion was increased to four lanes. An upgrade of the two-lane tunnels was proposed but has not been carried out.
The crossing was officially named the Lucius J. Kellam Jr. Bridge-Tunnel in August 1987 after one of the civic leaders who had long worked for its development and operation; however, it continues to be best known as the Chesapeake Bay Bridge-Tunnel. The complex was built by and is operated by the Chesapeake Bay Bridge and Tunnel District, a political subdivision of the Commonwealth of Virginia governed by the Chesapeake Bay Bridge and Tunnel Commission. Costs are recovered through toll collections. In 2002, a Joint Legislative Audit and Review Commission (JLARC) study commissioned by the Virginia General Assembly concluded that "given the inability of the state to fund future capital requirements of the CBBT, the District and Commission should be retained to operate and maintain the Bridge-Tunnel as a toll facility in perpetuity."
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History
Geographic background
In December 1606, the Virginia Company of London sent an expedition to North America to establish a settlement in the Colony of Virginia. After sailing across the Atlantic Ocean from England, they reached the New World at the southern edge of the mouth of what is now known as the Chesapeake Bay. They named the Virginia capes after the sons of their king, the southern Cape Henry, for Henry Frederick, Prince of Wales, and the northern Cape Charles, for his younger brother, Charles, Duke of York. A few weeks later they established their first permanent settlement on the southern, mainland, side of the bay, along the James River at Jamestown.
Across the bay, the area north of Cape Charles was located along what became known later as the Delmarva Peninsula. As it bordered the Atlantic Ocean to its east, the region became known as Virginia's Eastern Shore. As the entire colony grew, the bay was a formidable transportation obstacle for exchanges with the Virginia mainland. One of the eight original shires of Virginia was established there in 1634, eventually becoming the two counties of modern times. However, in comparison to mainland regions, commerce and growth was limited by the need to cross the bay. Consequently, little industrial base grew there, and most residents made their living by farming and working as watermen, both on the Bay (locally known as the "bay side") and in the Atlantic Ocean ("sea side").
Ferry system
For the first 350 years, ships and ferry systems provided the primary transportation.
From the early 1930s to 1954, Virginia Ferry Corporation, a privately owned public service company managed a scheduled vehicular (car, bus, truck) and passenger ferry service between the Virginia Eastern Shore and Princess Anne County (now part of Virginia Beach) in the South Hampton Roads area. This system, a portion of U.S. Route 13, was known as the Little Creek-Cape Charles Ferry. In 1951, the Northern terminus was relocated to a location now within Kiptopeke State Park.
Despite an expanded fleet of large and modern ships eventually capable of as many as 90 one-way trips each day, the lengthy crossing suffered delays due to heavy traffic and inclement weather.
In 1954, the Virginia General Assembly (state legislature) created a political subdivision, the Chesapeake Bay Ferry District and its governing body, the Chesapeake Bay Ferry Commission. The Commission was authorized to acquire the private ferry corporation through bond financing, to improve the existing ferry service.
Once the bridge-tunnel was built, much of the ferry equipment used by the Little Creek-Cape Charles Ferry service was then sold and redeployed to start the Cape May-Lewes Ferry across the 17-mile (27 km) mouth of the Delaware Bay between Cape May, New Jersey and Lewes, Delaware.
Studying a fixed crossing
In 1956, the General Assembly authorized the Ferry Commission to conduct feasibility studies for the construction of a fixed crossing. The conclusion of the study indicated that a vehicular crossing was feasible.
Consideration was given to service between the Eastern Shore and both the Peninsula and South Hampton Roads. Eventually, the shortest route, extending between the Eastern Shore and a point in Princess Anne County at Chesapeake Beach (east of Little Creek, west of Lynnhaven Inlet), was selected. An option to also provide a fixed crossing link to Hampton and the Peninsula was not pursued.
Initially, high-level bridges were contemplated to cross over the two main shipping channels on the selected route, Thimble Shoals Channel, which leads to Hampton Roads, and the Chesapeake Channel, which leads to points north in the Bay, notably the Port of Baltimore. However, the U.S. Navy objected, due to concerns that collapse of high level bridge(s) (due to either accidental or deliberate action) could cause a large portion of the Atlantic fleet based at the Norfolk Navy Base at Sewell's Point and other craft within the Hampton Roads harbor area to be blocked from access to the Atlantic Ocean.
To address these concerns, the engineers recommended a series of bridges and tunnels known as a bridge-tunnel, similar in design to the Hampton Roads Bridge-Tunnel, which had been completed in 1957, but a considerably longer and larger facility. The tunnel portions, anchored by four man-made islands of approximately 5 acres (2.0 ha) each, would be extended under the two main shipping channels. The CBBT was designed by the engineering firm Sverdrup & Parcel of St. Louis, Missouri.
Original Construction
In summer 1960, the Chesapeake Bay Ferry Commission sold $200 million in toll revenue bonds to private investors, and the proceeds were used to finance the construction of the bridge-tunnel. Funds collected by future tolls were pledged to pay the principal and interest on the bonds. No local, state, or federal tax funds were used in the construction of the project.
Construction contracts were awarded to a consortium of Tidewater Construction Corporation and Merritt-Chapman & Scott Corporation. The steel superstructure for the high-level bridges near the north end of the crossing were fabricated by the American Bridge Division of United States Steel Corporation. Construction of the bridge-tunnel began in October 1960 after a six-month process of assembling necessary equipment from worldwide sources.
The tunnels were constructed using the technique refined by Ole Singstad with the Baltimore Harbor Tunnel, whereby a large ditch was first dug for each tunnel, into which was lowered pre-fabricated tunnel sections cable-suspended from overhead barges. Interior chambers were filled with water to lower the sections, the sections then aligned, bolted together by divers, the water pumped out, and the tunnels finally covered with earth.
The construction was accomplished under the severe conditions imposed by nor'easters, hurricanes, and the unpredictable Atlantic Ocean. During the Ash Wednesday Storm of 1962, much of the partially completed work and a major piece of custom-built equipment, a pile driver barge called "The Big D", were destroyed. Seven workers were killed at various times during the construction. In April 1964, 42 months after construction began, the Chesapeake Bay Bridge-Tunnel opened to traffic and the ferry service discontinued.
The Ferry Commission and transportation district it oversees, created in 1954, were later renamed for the revised mission of building and operating the Chesapeake Bay Bridge-Tunnel. The CBBT district is a public agency and it is a legal subdivision of the Commonwealth of Virginia. However, the bridge-tunnel is supported financially by the tolls collected from the motorists who use the facility.
Eastern Shore native, businessman, and civic leader Lucius J. Kellam Jr. (1911-1995) was the original Commission's first chairman. In a commentary at the time of his death in 1995, the Norfolk-based Virginian-Pilot newspaper recalled that Kellam had been involved in bringing the multimillion-dollar bridge-tunnel project from dream to reality.
Before it was built, Kellam handled a political fight over the location, and addressed concerns of the U.S. Navy about prospective hazards to navigation to and from the Norfolk Navy Base at Sewell's Point.
Kellam was also directly involved in the negotiations to finance the ambitious crossing with bonds. According to the newspaper article, "there were not-unfounded fears that (1) storm-driven seas and drifting or off-course vessels could damage, if not destroy, the span and (2) traffic might not be sufficient to service the entire debt in an orderly way. Sure enough, bridge portions of the crossing have occasionally been damaged by vessels, and there was a long period when holders of the riskiest bonds received no interest on their investment."
An icon of eastern Virginia politics, Kellam remained chairman and champion of the CBBT throughout the hard times, and the bondholders were eventually paid as toll revenues caught up with expenses. He continued to serve until he was over 80 years old, finally retiring in 1993. He had held the post for 39 years.
The facility was renamed in his honor in 1987, over 20 years after it was first opened to traffic.
First Expansion Project (Completed 1999)
At a cost of $197 million, new parallel two-lane trestles were built both to alleviate traffic and for safety reasons. Immediately after completion of the parallel trestles, traffic was diverted to them and the original trestles and roadway underwent a $20 million retrofit, repairing the wear and tear of 35 years of service and upgrading certain features, such as repaving the road surface. The older portion of the facility was then reopened on April 19, 1999.
The 1995-1999 project increased the capacity of the above-water portion of the facility to four lanes, added wider shoulders for the new southbound portion, facilitated needed repairs, and provided protection against a total closure should a trestle be struck by a ship or otherwise damaged (which had occurred twice in the past); partially for this reason, the parallel trestles are not located immediately adjacent to each other, reducing the chance that both would be damaged during a single incident.
Second Expansion Project (currently under construction 2017/2022)
Construction is currently underway to add a second tunnel beside the existing tunnel located on the southern end (Thimble Shoals). The Tunnel Boring Machine is expected to be delivered to the site in 2018. After boring the machine will also be adding the circular concrete segments which will be delivered into the tunnel via mine cars one at a time.
- Tunnel Length: approximately one mile
- Tunnel Diameter: Inner Diameter (prior to roadway and support structure installation): 39 feet - Outer Diameter: 42 feet (concrete walls are three feet thick)
- Construction Cost: $755,987,318
- Construction Method: Bored tunnel
- Construction Start (estimate): October 1, 2017
- Construction Completion (estimate): October 1, 2022
- Maximum Tunnel Depth (Crown - at its deepest location (mid-channel)): 105 feet below the water surface
- Maximum Tunnel Depth (Invert - from the top of the roadway at its deepest location): 134 feet below the surface
- Soil Removal: The approximate amount of soil to be removed by the Tunnel Boring Machine (TBM) is 500,000 cubic yards.
- Concrete Sections: The tunnel will consist of approximately 9,000 individual concrete pieces. Approximately 42,000 cubic yards of concrete will be needed to make the tunnel sections.
Future Third Expansion Project (projected 2035-2040)
The northern end, a parallel Chesapeake Channel Tunnel will be added to finish the entire length to become a four lane highway from shore to shore. This project is marked to begin in 2035, which would possibly be open for traffic in 2040. Considering there are no setbacks and delays.
Chesapeake Bay Bridge To Virginia Beach Video
Operations, maintenance, and regulations
Toll collection facilities are located at both ends of the facility. Tolls are paid in each direction. As of 2013, the toll for cars (without trailers) traveling along the CBBT is $15. However, should a car make a return trip within 24 hours of the first, the second trip across costs $5. Motorcycles pay the same toll as cars without trailers. All other vehicles are charged based on size and purpose and are not subject to the return-trip discount. All tolls must be paid either in cash, by scrip tickets issued by the CBBT, or via E-ZPass electronic toll collection. The bridge-tunnel began accepting Smart Tag/E-ZPass payments on November 1, 2007.
All toll lanes including E-ZPass-only lanes are gated for safety concerns and to turn around inadmissible vehicles. For example:
- Strong winds have blown over certain vehicles. Therefore, some vehicles are banned when the wind speed exceeds 40 miles per hour (64 km/h). Level 6 wind restrictions with hurricane-force winds (at least 70 miles per hour (110 km/h), i.e. approaching the wind speed of a Category 1 hurricane, which is at least 74 miles per hour (119 km/h)), and other inclement weather conditions ban all traffic.
- Hazardous materials and compressed gas require various restrictions and inspections to safeguard the tunnels.
- Both tunnels have a height limit of 13 feet 6 inches (4.11 m). An over-height truck in April 2007 severely damaged the tunnels. Repairs took three weeks.
- Should police activities, accidents, or closures stop traffic from moving freely, gates prevent drivers from entering and then being forced to either back up within the narrow space or to wait too long in the middle of the bridge-tunnel.
The bridge-tunnel management prohibits bicycles but offers a shuttle van for $15. Cyclists must call ahead.
It is mandatory that the bridge be checked and serviced every five years. Since servicing the bridge takes about five years, the work never stops.
The Chesapeake Bay Bridge-Tunnel is one of only two automobile transportation facilities in Virginia that employs its own police department (the other is the Richmond Metropolitan Authority Toll Road Police). By original charter from the Commonwealth, it has authority to enforce the laws of Virginia. Emergency call boxes are spaced every half-mile (.8 km) along the bridge. The toll schedule, weather advisories, and other information are available at the official website for the bridge.
Tourism
The CBBT promotes the bridge-tunnel as not only a transportation facility to tourist destinations to the north and south, but as a destination itself. For travelers headed elsewhere, the bridge-tunnel can save more than 90 miles (140 km) of driving for those headed between Ocean City, Maryland, Rehoboth Beach, Fenwick Island, and Wilmington, Delaware (and areas north) and the Virginia Beach area or the Outer Banks of North Carolina, according to the CBBT district. Unlike the Interstate highways that travelers would avoid by taking the bridge-tunnel, however, the roads in the shortcut have traffic lights.
On the Delmarva peninsula to the north of the bridge, travelers may visit nearby Kiptopeke State Park, Eastern Shore National Wildlife Refuge, Fisherman Island National Wildlife Refuge (closed to the public), campgrounds and other vacation destinations. To the south are tourist destinations around Virginia Beach, including First Landing State Park, Norfolk Botanical Garden, Virginia Beach Maritime Historical Museum, Atlantic Wildfowl Heritage Museum, and the Virginia Aquarium and Maritime Science Center.
A scenic overlook is located at the north end of the bridge and was formerly located at South Thimble Island, near the south end. At South Thimble Island, passing ships may include U.S. Navy warships, nuclear submarines, and aircraft carriers, as well as large cargo vessels and sailing ships. A restaurant and gift shop on the island opened in 1964, along with the 625-foot-long (191 m) Sea Gull Pier. Bluefish, trout, croaker, flounder, and other species have been caught from the pier. Since birds use the habitat created by the bridges and islands of the CBBT, birders have travelled to the bridge-tunnel to see them at South Thimble Island and the scenic overlook at the north end. As part of the Thimble Shoal Channel Tunnel twinning, the building housing the restaurant and gift shop closed and access to the pier was prohibited starting at the end of September 2017. The building will be demolished and not replaced, and the pier will reopen to the public at the end of the project in 2022.
Dimensions
Among the key features of the Chesapeake Bay Bridge Tunnel are two 1-mile (1.6 km) tunnels beneath the Thimble Shoals and Chesapeake navigation channels and two pairs of side-by-side high-level bridges over two other navigation channels: North Channel Bridge (75 ft or 22.9 m clearance) and Fisherman Inlet Bridge (40 ft or 12.2 m clearance). The remaining portion comprises 12 miles (19 km) of low-level trestle, 2 miles (3.2 km) of causeway, and four man-made islands.
The CBBT is 17.6 miles (28.3 km) long from shore to shore, crossing what is essentially an ocean strait. Including land-approach highways, the overall facility is 23 miles (37 km) long (20 miles or 32 kilometres from toll-plaza to toll-plaza) and despite its length, there is only a height difference of 6 inches (152 mm) from the south to north end of the bridge-tunnel.
Man-made islands, each approximately 5.25 acres (2.12 ha) in size, are located at each end of the two tunnels. Between North Channel and Fisherman Inlet, the facility crosses at grade over Fisherman Island, a barrier island which is part of the Eastern Shore of Virginia National Wildlife Refuge administered by the U.S. Fish and Wildlife Service.
The columns that support the bridge-tunnel's trestles are called piles. If placed end to end, the piles would stretch for about 100 miles (160 km), roughly the distance from New York City to Philadelphia.
Major accidents
The Chesapeake Bay Bridge Tunnel has suffered three major ship accidents which caused the bridge tunnel system to be closed.
The first accident occurred in December of 1967 when the Mohawk, a coal barge, broke anchor and struck the bridge, closing it for two weeks for repair.
On January 21, 1970 the USS Yancey (AKA-93), a United States Navy attack cargo ship carrying 250 people, was at anchor near the bridge tunnel. During a gale with winds gusting in excess of 50 miles per hour (80 km/h), the Yancey dragged her anchors and hit the bridge stern first, knocking out a 375 foot (114 m) segment of trestle. There were no vehicles on the bridge at the time of the impact, and no one was injured during the incident. During the 42 days it took to replace the damaged span the Navy offered a free shuttle service for commuters using helicopters and LCUs.
In 1972, the bridge was again impacted by a barge which had broken loose, again closing the bridge-tunnel for two weeks while the span was repaired.
The bridge-tunnel is frequently impacted by barges moving through the highly trafficked area; however, most incidents cause no damage and only require a short closure of the system for inspections before reopening. The most recent example of this was the September 2011 barge strike, which only closed the bridge-tunnel for less than four hours.
Source of the article : Wikipedia
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