Canton Viaduct

Canton Viaduct
A west side view of the Canton Viaduct looking south with the former Paul Revere Copper Rolling Mill in the background, April 1977
Coordinates	42°09′32″N 71°09′14″W
Carries	2 tracks (standard gauge) presently serving: Amtrak's Northeast Corridor (intercity passenger) MBTA's Providence/Stoughton Line (commuter) CSX's Boston Subdivision (freight)
Crosses	Canton River (at Mill Pond) Canton River Valley Neponset Street
Locale	Canton, Massachusetts
Maintained by	Amtrak owned by the Massachusetts Bay Transportation Authority (MBTA)
Heritage status	National Register of Historic Places (1984) National Historic Civil Engineering Landmark (1998)
Characteristics
Design	Blind arcade cavity wall
Material	Walls - Granite Deck - Reinforced concrete
Total length	615'
Width	26'-28' (foundations), 22'-24' walls
Height	60' above river level, 70' maximum height
Longest span	2 at 28' (granite/concrete deck arches over the granite roadway portal)
No. of spans	71 total
Piers in water	7 (15 on land)
Clearance above	Approximately 21'
History
Designer	William Gibbs McNeill, Chief Engineer for the Boston & Providence Railroad (B&P)
Construction start	April 20, 1834
Opened	July 28, 1835
Statistics
Daily traffic	106 trains per day
Canton Viaduct
U.S. National Register of Historic Places
Location	Neponset and Walpole Sts., Canton, Massachusetts
Built	1834
NRHP reference No.	84002870
Added to NRHP	September 20, 1984
Location

Canton Viaduct is a blind arcade cavity wall railroad viaduct in Canton, Massachusetts, built in 1834–35 for the Boston and Providence Railroad (B&P).

At its completion, it was the longest (615 ft [187 m]) and tallest (70 ft [21 m]) railroad viaduct in the world; today, it is the last surviving viaduct of its kind. It has been in continuous service for 189 years; it now carries high-speed passenger and freight rail service. It supports a train deck about 60 feet (18 m) above the Canton River, the east branch (tributary) of the Neponset River. The stream pool passes through six semi-circular portals in the viaduct.

The viaduct was the final link built for the B&P's then 41-mile (66 km) mainline between Boston, Massachusetts; and Providence, Rhode Island. Today, the viaduct serves Amtrak's Northeast Corridor, as well as Massachusetts Bay Transportation Authority (MBTA) Providence/Stoughton Line commuter trains. It sits 0.3 miles (0.5 km) south of Canton Junction, at milepost 213.74, reckoned from Pennsylvania Station in New York City, and at the MBTA's milepost 15.35, reckoned from South Station in Boston.

Inception

A partial isometric elevation of the Canton Viaduct with the deck removed; there are 21 cavities in the viaduct

The Canton Viaduct was erected in 1835 by the Boston and Providence Railroad (B&P), one of the first New England railroads, shortly after its 1831 founding. It was designed by a U.S. Army Corps of Engineers Officer and West Point graduate - Captain William Gibbs McNeill. He was assisted by engineers, Major George Washington Whistler (McNeill's brother-in-law), Major General Isaac Ridgeway Trimble and General William Raymond Lee. McNeill and Whistler were the uncle and father of the artist James McNeill Whistler. The viaduct was built by the Dodd & Baldwin company from Pennsylvania; the firm was established by cousins Ira Dodd and Caleb Dodd Baldwin. Around this time, Russia was interested in building railroads. Tsar Nicholas I sent workmen to draw extensive diagrams of the Canton Viaduct. He later summoned Whistler to Russia as a consulting engineer to design the Moscow–Saint Petersburg Railway, on which two viaducts were modeled after the Canton Viaduct. A scale model viaduct of similar design is on display at the Oktyabrsky Railroad Museum in St. Petersburg.

Design and construction

Classification

This Canton Viaduct is the first and possibly only viaduct to use both a blind arcade and cavity wall structure. Although the deck arches appear to extend through to other side, they do not; each deck arch is only four feet deep. The deck arches support the spandrels, deck (beyond the walls), coping and parapets; they are not tied to the longitudinal walls. The only arches that extend through to the other side are six river portals and two roadway portals. The 'buttresses' are also unique in that they extend through to the other side, so they are actually transverse walls.

Materials

Video of the west side of Canton Viaduct sweeping from north to south - no sound

The Canton Viaduct contained 14,483 cubic feet (15,800 perches) of granite, which weighs approximately 66,000,000 pounds (33,000 short tons) prior to its concrete redecking in 1993. Each stone has a Mason's mark to identify who cut the stone. Each course is 22" - 24" high and laid in a pattern closely resembling a Flemish bond. Exterior stone for the walls, wing wall abutments, portals, deck arches, coping, parapets and the foundation stone are riebeckite granite mined from Moyles quarry (a.k.a. Canton Viaduct Quarry) located on the westerly slope of Rattlesnake Hill in Sharon, Massachusetts; now part of Borderland State Park.

Location

Canton Viaduct foundation plan and west elevation

The majority of the viaduct is over land (71%), while 29% is over water. In addition to the six river portals, one roadway portal was originally provided. The distance between the transverse walls at this section is wider than all the other sections of the viaduct. The overall length is 615 feet (187 m) with a one degree horizontal curve that creates two concentric arcs. This makes the west wall slightly shorter than the east wall producing a slight keystone shape in the cavities. Originally unnamed, it was referred to as "the stone bridge" and "the viaduct at Canton" before it was eventually named after the town. The foundation stone was laid on Sunday, April 20, 1834, with a Masonic Builders' rites ceremony. Following to Masonic tradition, the foundation stone was located in the northeast corner of the structure.

Construction

A random sample of Canton Viaduct Mason's marks; there are thousands of stones in the structure and each has a symbol to identify who cut the stone.

The Canton Viaduct cost $93,000 to build ($2,746,800 today). Construction took 15 months, 8 days from laying of the foundation stone on April 20, 1834, to completion on July 28, 1835.

The first and last transverse walls (next to the wing wall abutments) are only 3 feet wide, all the other transverse walls are 5 feet, 6 inches wide. The wing wall abutments are 25 feet wide where they meet the viaduct; they are curved and stepped and were excavated by William Otis using his first steam shovel. From the top of the wing walls to midway down, the stones are of 2' wide; from midway down to the bottom of the wing walls the stones are 4' wide.

The coping is supported by 42 segmental deck arches (21 on each side) that span the tops of 22 transverse walls beyond the longitudinal walls. The longitudinal walls are five feet thick with a four-foot gap between them joined with occasional tie stones. More construction details are available in the original specifications. When the viaduct had a single set of tracks, the rails were placed directly over the longitudinal walls as the cavity's width is less than standard gauge. When the viaduct was double tracked in 1860, the inside rails were placed directly over the longitudinal walls and the outside rails were supported by the deck arches.

The viaduct was "substantially complete" in June 1835 from various accounts of horse-drawn cars passing over it during that time. The viaduct was built before the advent of construction safety equipment such as hard hats and fall arrest devices. Surprisingly, no deaths were recorded during the construction, but deaths have occurred at the viaduct since completion; mainly from people crossing it while trains passed in opposite directions. Charlie, the old white horse who had hauled the empty railcars back to Sharon, Massachusetts (4 miles), was placed upon the flat car and hauled across the viaduct by the workers, thus becoming the first "passenger" to cross the structure.

A June 6, 1835, article in the Providence Journal describes it. As reported by the Boston Advertiser and the Providence Journal, "Whistler" was the first engine to pass over the entire length of the road.

Aside from seasonal vegetation control and occasional graffiti removal, the viaduct requires no regular maintenance other than periodic bridge inspections from Amtrak.

Dedication Stone

The Canton Viaduct Dedication Stone now rests in Canton Viaduct Park on a curved wall (see gallery) over a keystone removed during the 1993 deck replacement.

Canton Viaduct Dedication Stone

The Canton Viaduct Dedication Stone was originally laid in the west parapet, south end.

The capstone was laid in the south end of the west parapet. This stone sat atop the Dedication Stone and it was the last stone to be laid in the viaduct.

The Dedication Stone is actually two stones now held together with two iron straps on each end. The overall dimensions are approximately 60" long × 36" high × 18" wide, and it weighs approximately 3,780 lbs. The Dedication Stone was originally topped with a 63" long × 8" high × 24" wide capstone with double beveled edges, creating an irregular hexagonal profile. Due to its breaking in 1860, the Dedication Stone is about 1" shorter today than its original height. The damage obscured two directors' names, W. W. Woolsey and P. T. Jackson. Woolsey was also a Director of the Boston & Providence Railroad & Transportation Co. (B&P RR&T Co.) in Rhode Island (incorporated May 10, 1834) which owned the Rhode Island portion of the Boston and Providence rail line. The B&P RR&T Co. merged with the B&P on June 1, 1853.

Railroad track

During the 1993 deck renovation, two 18-inch-deep troughs were discovered recessed into the granite deck stones running the entire length of the viaduct and spaced at standard gauge width (56+1⁄2 inches). The troughs contained longitudinal baulks and were part of the original construction. The baulks supported the rails without the need for transoms as the gauge was maintained by the longitudinal troughs. This is the only known instance of transomless baulks recessed in granite slabs; the original tracks before and after the viaduct used baulks making the B&P originally a baulk railroad. A 1910 photo taken atop the viaduct shows dirt between the cross ties and tracks, so this material may have been used before traditional gravel ballast.

Baulks were used to support strap rails or bridge rail. These early rails would have been replaced with flanged T-rails by 1840. These photos show baulks at Canton Junction in 1871. An 1829 report from the Massachusetts Board of Directors of Internal Improvements describes how the railroad from Boston to Providence was to be built. The report states, "It consists of one pair of tracks composed of long blocks of granite, about one foot square, resting upon a foundation wall extending to the depth of 2+1⁄2' below the surface of the ground, and 2' wide at the bottom". The report also calls for using horse-drawn wagons and carriages at 3 MPH on the rail line, not steam locomotives.

Construction sequence

The Canton Viaduct was constructed in the following sequence:

Planning

• Design and specifications

Preconstruction

• Site preparation, mobilization, surveying, excavation (using timber piling), river diversion (using cofferdams)

Construction

• Wing wall abutments - foundations and walls (using scaffolding)
• Temporary train platforms and embankment staircases at abutments
• Walls:
  • Foundations - the Foundation Stone was the first stone to be laid on April 20, 1834 (northeast corner) with Masonic Builders' rites ceremony
  • Walls and portals (using falsework)
  • Deck arches (using falsework)
  • Spandrels
  • Cavity slabs
  • Deck slabs (with longitudinal troughs) and coping
  • Parapets - the capstone was the final stone to be laid at the southwest end with Masonic ceremony

Post Construction

• Track installation - baulks, rail and ballast - the first "passenger" was Charlie, the workhorse
• Site cleanup and demobilization
• Opening ceremony - July 28, 1835. The first train, "Whistler" passed over the Canton Viaduct at approximately 5:00 PM local solar time.

Waterway

A west side view of the Canton Viaduct with its waterfall in the foreground.

Spillway Dam at Neponset Street, also known as Canton Viaduct Falls, impounds Mill Pond. It is a weir or low head dam that is owned by the MBTA. The 16' high by 90' long granite dam was built in 1900; as of 2009, it averages 78 cu ft/s (133 m³/min) annual discharge. Water power was supplied to nearby businesses via water wheel from the canal starting at the waterfall's enclosed plunge pool and continuing about 200' under the Neponset St. bridge. There were also two channels located between the viaduct and the waterfall (one on each side) referred to as sluices, headraces and flumes in various maps. They were filled in sometime after 1937 (U.S. Army Corps of Engineers National Inventory of Dams No. MA03106).

Ownership

• 1834–1888, Boston & Providence Railroad Corp.
• 1888–1893, Old Colony Railroad Co.
• 1893–1969, New York, New Haven and Hartford Railroad Co.
• 1969–1973, Penn Central Transportation Company
• 1973–present, Massachusetts Bay Transportation Authority

Critical infrastructure

• World War I - A detachment of the 9th Regiment National Guard arrived in April 1917 to guard the viaduct from sabotage, via sentry duty.
• World War II - Canton's Civil Defense Corps and railroad employees guarded the viaduct against sabotage since the train line is part of the direct link between Boston and New York City. The structure is a critical transportation link between the two cities and had extra protection as a result.
• War on Terrorism - Shortly after the terrorist attacks of September 11, 2001 the Canton Viaduct was guarded by various security entities until the U.S. threat level decreased.

In a letter to Canton's Board of Selectmen on February 27, 2002, former Police Chief Peter Bright noted that Massachusetts Emergency Management Agency training for worst-case situations highlights the destruction of the Canton Viaduct for its disruption of the national railroad system; the Federal Government also considers the viaduct a high-risk target.

Recognition

This B&P stock certificate was issued two months after the viaduct was completed, signed by B&P President William W. Woolsey. Canton Viaduct was depicted in the vertical vignette (east side) on all B&P stock certificates for 115 years (from 1835 to 1950). The viaduct is shown with a fence/rail instead of stone parapets for an unobstructed view of the train. The center vignette shows a paddle steamer (side wheeler) with a 24 star American flag. The B&P also owned shipping lines as part of their transportation business.

Canton Viaduct Park monument prior to the placement of the commemorative plaque, south of the Dedication Stone.

The Canton Viaduct commemorative plaque.

• The Canton Viaduct was listed on the National Register of Historic Places in 1984.
• The viaduct has been designated a National Historic Civil Engineering Landmark in 1998 by the American Society of Civil Engineers.

Current status

In June 2004 the town of Canton developed a Master Plan that identifies what should be preserved and enhanced to meet evolving needs and improve the quality of life.

Gallery

• 
  Canton Viaduct curved, stepped wing wall abutment at the north end, west side; the Dedication Stone can be seen (above) in its former location.
• 
  Canton Viaduct coping - A row of granite coping can be seen projecting 6" beyond the wall between the granite deck arches and the new concrete deck.

See also

• National Register of Historic Places listings in Norfolk County, Massachusetts
• List of bridges documented by the Historic American Engineering Record in Massachusetts
• List of bridges on the National Register of Historic Places in Massachusetts

Further reading

• Galvin, Edward, D. (1987). A History Of Canton Junction. Brunswick: Sculpin Publications.
• Fisher, Charles, E. (1917). A Little Story Of The Boston And Providence Railroad Company.
• Herrin, Dean, A. (2002). America Transformed: Engineering And Technology In The Nineteenth Century: Selections From The Historic American Engineering Record, National Park Service. Reston: American Society of Civil Engineers. ISBN 978-0-7844-0529-1
• Cook, Richard, J. (1987). The Beauty Of Railroad Bridges: In North America - Then And Now. San Marino: Golden West Books. ISBN 978-0-87095-097-1
• Cleary, Richard, L. (2007). Bridges. W.W. Norton & Co. ISBN 978-0-393-73136-1
• Cramb, Ian. (2006), The Art Of The Stone Mason. Chambersburg: Hood & Co. ISBN 978-0-911469-27-1
• Canton Bicentennial Historical Committee. (1997), Canton Comes Of Age 1797–1997: A History Of The Town Of Canton, Massachusetts. Canton: The Town of Canton
• Comeau, George, T. (2009). Canton - Postcard History Series. Mount Pleasant: Arcadia Publishing. ISBN 978-0-7385-7203-1
• Cox, Terry. (2003). Collectible Stocks And Bonds From North American Railroads: Guide With Prices. Arvada: TCox & Associates. ISBN 978-0-9746485-0-7
• Boothroy, Stephen, J. (2002). Down At The Station: Rail Lines Of Southern New England In Early Postcards. Cranberry Junction. ISBN 978-0-9714961-4-9
• Jackson, Donald, C. (1988). Great American Bridges And Dams. Wiley. ISBN 978-0-471-14385-7
• Barber, John, W. (1844). Historical Collections, Being A General Collection Of Interesting Facts, Traditions, Biographical Sketches, etc., Relating To The History And Antiquities Of Every Town In Massachusetts, With Geographical Descriptions, Illustrated By 200 Engravings. Heritage Books. ISBN 978-1-55613-463-0
• DeLony, Eric. (1993). Landmark American Bridges. Little Brown and Company. ISBN 978-0-8212-2036-8
• Middleton, William, D. (1999). Landmarks On The Iron Road: Two Centuries OF North American Railroad Engineering. Bloomington: Indiana University Press. ISBN 978-0-253-33559-3
• Kirkland, Edward C. (1948). Men, Cities And Transportation - A Study In New England History 1820–1900 Volumes I-II. Cambridge: Harvard University Press.
• National Park Service. (1995). National Register Of Historic Places 1966 To 1994. Wiley. ISBN 978-0-471-14403-8
• Solomon, Brian. (2008). North American Railroad Bridges. Voyageur Press. ISBN 978-0-7603-2527-8
• Adams, Charles, F. (1878). Railroads: Their Origin And Problems. Ayer Co. Publishing. ISBN 978-0-405-13764-8
• Harlow, Alvin, F. (1946). Steelways Of New England. New York: Creative Age Press, Inc. *Rogers, Robert. (1952).
• Middleton, William D. "They're Still There: High Speed Rail's 1835 Underpinning," American Heritage of Invention and Technology, Spring 2001 Volume 16, Issue 4, pp 52–55
• Parry, Albert. (1938). Whistler's Father. Foster Press. ISBN 978-1-4067-7594-5

External links

• USDOT Crossing No. 537243N
• USGS GNIS Feature ID: 1954416
• USNGS Permanent ID: MY0489