Hamden Covered Bridge, Hamden New York

Date added: April 19, 2024

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The Hamden Covered Bridge is a rare and substantially intact example of rural vernacular bridge design and construction in the Catskill region. Constructed in 1859, the 128-foot, timber-framed structure incorporates the Long truss design and is one of only 3 examples of its type and method of construction remaining in New York State. Built as a vehicular bridge to serve the needs of local residents, the Hamden Covered Bridge continues its historic function as a public crossing on the West Branch of the Delaware River.

Though the first permanent settlement of the town of Hamden occurred in 1799, the area has remained remote and sparsely settled to the present. Forest products quickly became the chief output of this wooded, mountainous region of the Catskills. Laced by numerous streams and tributaries of the Delaware River, this area relied upon abundant local materials and available rural craft skills to provide needed road bridges, a regional trend that persisted into the first decades of the twentieth century. Constructed of timber cut and sawed in the local area, the Hamden Covered Bridge reflects this vernacular design and building tradition. Erected in 1859 by local builder Robert Murray under contract with the town of Hamden, the bridge incorporated the timber truss design first patented in 1830 by Col. Stephen H. Long. While the Long truss design proved moderately popular during the middle decades of the nineteenth century, only 3 examples of this type of covered bridge remain in New York State.

Although hundreds of covered wood truss bridges were built throughout New York, only 24 remain.

The history of covered timber bridge construction in New York State spans the period from the first decade of the nineteenth century to the era of the First World War. The earliest known extant covered bridge was built in 1825; the latest in 1912.

Throughout much of the nineteenth century, New York was predominantly rural; its settlement pattern generally consisted of widely separated communities whose economy was based upon subsistence agriculture and local water-powered industry. Few improved roads connected population centers. As the Empire State grew and its economy expanded, however, road and bridge improvements became essential for linking emerging centers of civic market activity.

The earliest permanent bridges in New York were constructed using readily available local materials and skills. Because the cost of constructing bridges generally was the responsibility of local governments, they turned to readily available materials and skills for this purpose. The abundant timber and stone resources found throughout much of New York State made these materials the logical choice for bridge construction during the period of significance. The relative ease of construction was another factor that mitigated in favor of wooden bridge construction. The timber framing skills of local millwrights and joiners were readily adaptable to the construction of timber bridges.

During the Colonial period, the first timber bridges incorporated the Kingpost or the Queenpost truss configuration. These simple, open structures with plank decks were widely erected across small streams, though their use was limited to clear spans less than fifty feet in length. Longer crossings were possible using multiple spans supported by mid-stream piers or timber cribbing. The open timber truss bridge remained an inexpensive and popular form for farm bridges and crossings on minor roads until the early twentieth century, when it was supplanted by the metal span. The open trusswork was sometimes sheathed with protective weather boards to preserve the life of the truss. Because of its horizontal top chord, it was possible to cover a Queenpost truss bridge with a protective roof. The Copeland Covered Bridge (1879), a farmer's bridge in rural Saratoga County, is an extant example of a covered Queenpost truss bridge remaining in New York.

From the early decades of the nineteenth century, the cost of building and maintaining timber bridges generally fell upon local governments or state-chartered bridge or turnpike companies, which were established as for-profit ventures. It soon became evident that protecting the bridge's structural system from the elements would reduce the burden of maintenance and replacement costs. This protection was most readily achieved by covering the timber truss bridge with a roof and board sheathing to enclose the frame structure.

During the Federal period, inventor Theodore Burr (1772-1822) designed a highly successful long-span bridge form that combined the structural advantages of a simple timber truss with a relieving arch. Burr patented his timber truss design in 1817. His first successful bridge was a four-span structure erected across the Hudson River at Waterford, New York in 1804. Built of hand-hewn pine structural members, the Waterford bridge was sheathed with pine plank siding and covered by a shingled roof. Burr's bridge stood for more than a century until it was destroyed by fire in 1909. The Burr Arch Truss is represented in New York by three extant historic covered bridges: Perrine's Bridge (1844), Ulster County, Salisbury Center Bridge (1875), Herkimer County, and the Hyde Hall Bridge (1825), Otsego County.

A successful truss design nearly contemporary with the Burr truss was the Town lattice truss, patented in 1820 by the versatile builder/architect Ithiel Town (1784-1844). Consisting of a horizontal top and bottom chord connected by a web of closely spaced, alternating diagonal timbers, the Town lattice truss included no vertical members; the required stiffness was achieved by connecting the intersecting diagonals with wood pins. Carried on piers placed at intervals, bridges incorporating the Town lattice truss could span considerable distances. Its inherent strength coupled with its ease of construction made the Town truss design a popular design for highway and early railroad bridges until the post-Civil War era. The covered bridges at Eagleville and Shushan, Washington County, are notable examples of the Town truss form.

During the 1830s, Colonel Stephen H. Long (1784-1864) of the U.S. Army Corps of Topographical Engineers perfected a rigid timber truss form that incorporated panels consisting of intersecting diagonals and counters. Long's initial patented design of 1830 for an "assisted truss" included a redundant Kingpost relieving truss above the center panel points (where the greatest flex would occur). With practical experience, Long refined his design to eliminate its "overbuilt" characteristics, receiving additional patents in 1836 and 1839. The Old Blenheim Bridge (1855), Schoharie County, (destroyed 2011) was a notable example of the Long truss design.

The final major timber truss design to achieve widespread popularity during the late nineteenth century was first patented in 1840 by William Howe (1803-1852). The Howe truss consisted of horizontal timber top and bottom chords and diagonal wood compression members combined with vertical tension members made of wrought iron. The ends of the iron tensions rods were threaded and secured to iron shoes at the panel points of the web. The inherent properties of wood and iron as construction materials were effectively used in Howe's truss; this hybrid truss became the most widely constructed, standard American timber bridge form of the nineteenth century. The Rexleigh (1874) and Buskirk (1857) Covered Bridges in Washington County and the Jay Covered Bridge (1857), Essex County, are Howe truss structures.

By the third quarter of the nineteenth century, the covered timber truss bridge was being supplanted by the manufactured metal truss bridge on the roads and rail lines of New York State. Stimulated by wartime growth and development, iron manufacturers turned to production of standardized metal bridge components in the post-Civil War era. The increased strength, ease of construction, and reduced cost associated with metal bridges won favor among local governments and railroad companies; by the 1880s, the heyday of wooden bridge-building had passed. Although several examples of covered timber truss spans remain from the early twentieth century in rural areas of New York, the advantages of iron bridges were clearly understood and widely applied well before 1900.

Bridge Description

The Hamden Covered Bridge is located in the hamlet of Hamden, Delaware County. The timber-framed, gable-roofed bridge carries Basin Clove Road across the West Branch of the Delaware River. Originally erected as a single span in 1859, the bridge was modified in 1940 when a center pier supporting a relieving beam was added. Set amid the picturesque surroundings of the Catskill Mountains, the Hamden Covered Bridge is sited with its portal ends oriented east and west.

The general dimensions of the Hamden Covered Bridge are as follows:

Overall length: 128'
Overall width: 18'
Deck width: 14'
Portal height: 9'
Portal width: 14'

The timber bridge originally rested upon abutments built of dry-laid fieldstone; these abutments were capped with concrete and the footings encased in concrete during the twentieth century. The 13-panel web of the superstructure incorporates the Long truss. The top chord consists of four parallel plank members; the bottom chord is a large square timber flanked by parallel heavy planks. Each panel of the truss consists of paired, sawed timber vertical members separated by paired timber diagonals and single counters. Truss members are attached to the top and bottom chords at the panel points using long, threaded iron bolts secured with nuts. Floor beams that extend beyond the width of the truss support a pair of enclosed timber buttresses near the center of the span. Sway bracing of intersecting diagonal beams is secured to the top chord using mortise and tenon joinery. The deck consists of nail-laminated, oak 2 x 4 boards laid laterally on edge upon longitudinal stringers, which in turn are supported by 9 x 12 timber floor beams. The entire bridge is sheathed in vertical board and batten siding is attached to horizontal nailers. The roof structure consists of nail strips covered with galvanized metal sheathing.

The Hamden Covered Bridge has experienced periodic, selective replacement of deteriorated elements over time. In recent years, steel box beam guardrails have been installed to protect both portals from damage from vehicles crossing the span.