Lawrence is a city located in Essex County, Massachusetts, United States, on the Merrimack River. At the 2020 census, the city had a population of 89,143. Surrounding communities include Methuen to the north, Andover to the southwest, and North Andover to the east. Lawrence and Salem were the county seats of Essex County, until the Commonwealth abolished county government in 1999. Lawrence is part of the Merrimack Valley.
Methuen is a 23-square-mile city in Essex County, Massachusetts, United States. The population was 53,059 at the 2020 census. Methuen lies along the northwestern edge of Essex County, just east of Middlesex County and just south of Rockingham County, New Hampshire. The city is bordered by Haverhill to the northeast, North Andover to the southeast, Lawrence and Andover to the south, Dracut to the west, Pelham, New Hampshire to the northwest, and Salem, New Hampshire to the north. Methuen is located 17 miles (27 km) southwest from Newburyport, 30 miles (48 km) north-northwest of Boston and 25 miles (40 km) south-southeast of Manchester, New Hampshire.
North Andover is a town in Essex County, Massachusetts, United States. At the 2020 census the population was 30,915.
The Whirlpool Rapids Bridge, commonly known as the Whirlpool Bridge or the Lower Steel Arch Bridge, is a spandrel braced, riveted, two-hinged arch bridge that crosses the international border between Canada and the United States, connecting the commercial downtown districts of Niagara Falls, Ontario and Niagara Falls, New York. This bridge is located approximately 1.5 kilometres (0.9 mi) north of the Rainbow Bridge and about 2 kilometres (1.2 mi) from the Falls. It was acquired by the Niagara Falls Bridge Commission in January 1959. Immediately upstream is the similar arch-style Michigan Central Railway Bridge, which has been out of service since 2001.
The Middlesex Canal was a 27-mile (44-kilometer) barge canal connecting the Merrimack River with the port of Boston. When operational it was 30 feet wide, and 3 feet deep, with 20 locks, each 80 feet long and between 10 and 11 feet wide. It also had eight aqueducts.
Completed in 1796, the Pawtucket Canal was originally built as a transportation canal to circumvent the Pawtucket Falls of the Merrimack River in East Chelmsford, Massachusetts. In the early 1820s it became a major component of the Lowell power canal system. with the founding of the textile industry at what became Lowell.
Job Abbott was an American-born Canadian civil engineer who helped pioneer the construction of steel bridges in Canada, including many for the Canadian Pacific Railway, such as the 3,400-foot (1,000 m) Lachine Bridge in Montreal.
Wendel Bollman was an American self-taught civil engineer, best known for his iron railway bridges. Only one of his patented "Bollman truss" bridges survives, the Bollman Truss Railroad Bridge in Savage, Maryland. The Wells Creek Bollman Bridge near Meyersdale, Pennsylvania is also standing, although that bridge uses the Warren truss system.
The Phoenix Iron Works, located in Phoenixville, Pennsylvania, was a manufacturer of iron and related products during the 19th century and early 20th century. Phoenix Iron Company was a major producer of cannon for the Union Army during the American Civil War. The company also produced the Phoenix column, an advance in construction material. Company facilities are a core component of the Phoenixville Historic District, a National Register of Historic Places site that was in 2006 recognized as a historic landmark by ASM International.
The Merrimack Canal is a power canal in Lowell, Massachusetts. The canal, dug in the 1820s, begins at the Pawtucket Canal just above Swamp Locks, and empties into the Merrimack River near the Boott Cotton Mills. The Merrimack Canal was the first major canal to be dug at Lowell exclusively for power purposes, and delivered 32 feet (9.8 m) of hydraulic head to the mills of the Merrimack Manufacturing Company. The Merrimack Manufacturing Company was the first of the major textile mills constructed in Lowell. It was demolished around 1960.
Squire Whipple was an American civil engineer.
Thomas William Henry Harrison Moseley was a builder and designer of wrought-iron arch bridges. He is best known for his "Wrought-Iron Lattice Girder Bridge" patent of August 30, 1870. The only known surviving example of this type of bridge structure is the Hares Hill Road Bridge located in Chester County, Pennsylvania.
The Hares Hill Road Bridge is a single-span, wrought iron, bowstring-shaped lattice girder bridge. It was built in 1869 by Moseley Iron Bridge and Roof Company and is the only known surviving example of this kind. The bridge spans French Creek, a Pennsylvania Scenic River.
The Moseley Iron Bridge Company was founded by Thomas William Moseley in Cincinnati, Ohio around 1858 and existed until 1879. Moseley was an engineer, bridge builder, and designer. John Paul Verree used T.W.H. Moseley's designs for his bridge manufacturing business in Philadelphia, Pennsylvania.
The Bardwell's Ferry Bridge, built in 1882, is a historic lenticular truss bridge spanning the Deerfield River between the towns of Shelburne and Conway in Franklin County, Massachusetts. The bridge is listed on the National Register of Historic Places and is designated as a Massachusetts Historic Civil Engineering Landmark by the American Society of Civil Engineers.
The Boott Mills in Lowell, Massachusetts were a part of an extensive group of cotton mills, built in 1835 alongside a power canal system in this important cotton town. Its incorporators were Abbott Lawrence, Nathan Appleton, and John Amory Lowell, and is named after Kirk Boott, the first Agent of the Proprietors of Locks & Canals in Lowell. Today, the Boott Mills complex is the most complete remainder of antebellum textile mills built in Lowell. The original Mill No. 6 is managed by the National Park Service unit Lowell National Historical Park and houses the Boott Cotton Mills Museum and the Tsongas Industrial History Center for K-12 educational programs.
The North Canal Historic District of Lawrence, Massachusetts, encompasses the historic industrial heart of the city. It is centered on the North Canal and the Great Stone Dam, which provided the waterpower for its many mill complexes. The canal was listed on the National Register of Historic Places in 1975, while the district was first listed in 1984, and then expanded slightly in 2009.
The Chain Bridge in Newburyport, Massachusetts, is a "look-alike" replica built in 1910 to replace the "first suspension bridge" constructed in the United States in 1810. Since the current structure is one of a series of bridges at this location since 1793, it is "the oldest continually occupied, long span, bridge crossing" in the US. It has also been called the Essex-Merrimac Bridge or Newburyport Chain Bridge.
The Merrimack Valley is a bi-state region along the Merrimack River in the U.S. states of New Hampshire and Massachusetts. The Merrimack is one of the larger waterways in New England and has helped to define the livelihood and culture of those living along it for millennia.
Spring Garden Street Bridge is a highway bridge in Philadelphia, Pennsylvania. It crosses the Schuylkill River below Fairmount Dam and connects West Philadelphia to the Philadelphia Museum of Art and Benjamin Franklin Parkway. It is the fourth bridge at this location.
