of the Middle Atlantic States (1959), students of covered bridges have accepted his assertion that the first covered bridge in the United States was Timothy Palmer’s “Permanent Bridge” of 1801–5, which Owen Biddle covered with roof and siding only after completion of the trusses in early 1805. But Allen’s book also hid an apparent secret in full sight on page 2, that the idea of a covered bridge had been recognized as early as 1787, some eighteen years earlier. The first issue of The Columbian Magazine, published in January 1787, included a detailed drawing of a proposed bridge by an anonymous builder, presumably to cross the Schuylkill in four spans. The cutaway drawing clearly shows what was later called a “multiple kingpost truss” with additional arches that appear to rest on the lower chords and not into the abutments and piers.
The first known drawing of an American covered bridge was published in the January, 1787 issue of The Columbian Magazine. (1787: 4)
Indeed, this is exactly what was later known as a Burr truss or Burr arch after Theodore Burr. Since Burr would have been only sixteen at the time, it is highly unlikely he had anything to do with it, and besides, he was being raised in distant Torrington, Connecticut. Both roof and siding are clearly visible. Granted, there is no evidence that this exact bridge was ever built, but clearly builders already envisioned the type of bridge that became typical only twenty or so years later. The most likely reason for its not having been built is that masons had no way to build the three stone piers in the river’s deep waters.
Earliest Documented Wooden Bridges
The “covered bridge,” including Palmer’s “Permanent Bridge” of 1805, of course did not just appear out of the blue. It developed within the historical context of American bridge building, and the act of covering a bridge was simply an option chosen more and more when builders wearied of having to rebuild bridges every few years because they kept rotting and collapsing, wisely giving in to common sense. Builders resisted covering their work because some believed it trapped moisture inside or provided too much wind resistance, while others thought a cover denied the public the opportunity to be awestruck by the magnificence of their work. While true that Palmer’s great bridge over the Schuylkill was the first documented covered bridge, it was but one of Palmer’s many engineering feats. And feats they were. But Palmer was not alone. The first generation of American bridge builders included some of the boldest bridge designers and builders in American engineering history. This Hall of Fame must include at least these additional names: Colonel Enoch Hale (1743–80), Moody Spofford (1744–1828), Jacob Spofford (1755–1812), Timothy Palmer (1751–1821), William Weston (1763–1833), John Templeman, Samuel Carr, Theodore Burr (1771–1822), Lemuel Cox (1736–1806), James Finley (1756–1828), and Samuel Sewall Jr (1724–1815).
One can hardly speak of a road system during the colonial period, the sparsely populated cities being connected with an uncertain system of dirt/mud roads, sometimes “paved” with corduroy (logs), many of them private turnpikes. If bridges crossed any of the many streams and rivers, they had to have been simple structures little noted in written documents. Some that were noted were built by Lemuel Cox who, with Samuel Sewall Jr, built several pile and trestle bridges before the Revolutionary War. Their “Great Bridge” or “Sewall’s Bridge,” some 270 feet long, built in 1761, crossed the York River in what is now York, Maine.
After the war, Cox built a toll bridge 1,503 feet long linking Boston and Charlestown, which opened on June 17, 1786. The next year he built another over the Mystic River north of Cambridge, Massachusetts. His greatest pile and trestle structure, however, bridged the Charles River at West Newton with a structure 3,483 feet long and 40 feet wide that was carried on 180 wooden trestles (Allen, 1991: 11–14). Most of these included a drawspan to allow boats to pass. Caulkins’ History of Norwich, Connecticut, quoted earlier, details the innumerable bridges built in that area, few of which lasted longer than two or three years: “These early bridges, being supported mainly by heaps of stones, and studs driven into the bed of the river, could offer but slight resistance to the crushing piles of ice that came down with the released waters in the time of floods” (1874: 350).
Sewall’s Bridge, built in 1761 by Samuel Sewall Jr over the York River at York, Maine, was possibly the first American pile-driven bridge with a draw-span, some 270 feet long. It was replaced in 1934 by a new bridge of similar design. (Library of Congress, 1908)
An old log trestle built to carry a rail line running through the mountains between Santa Cruz and Felton, California. (Terry E. Miller, 2012)
Most bridge historians credit Revolutionary War hero Colonel Enoch Hale with constructing the nation’s first substantial bridge. Built in 1785, it crossed the Connecticut River far to the north of Boston and Philadelphia, at Bellow’s Falls, Vermont, where the river is narrowed by dramatic rock outcroppings. Here was a critical crossing point where the usual solution, a ferry, was not feasible. Although it was an open wooden structure, Hale’s crossing lasted an amazing fifty-five years, until 1840, when it was replaced by a substantial covered bridge, by then a typical solution. Hale’s Bellow’s Falls crossing consisted of massive beams placed vertically at key points on the rocky outcroppings, with a flat deck above supported by heavy wooden corbels running at 45 degrees from the vertical posts to the deck beams and forming what appears as a simple triangular “arch.” Considering the limited construction technology of the day, it is a wonder that mere men could place such heavy timbers within a dangerous river bed and complete such a long-lasting structure (Litwin, 1964: 13).
A possible “missing link” in American bridge history is the “Leffingwell Bridge,” named after the nearest landowner. According to Frances Manwaring Caulkins, writing originally in 1845, and quoting a newspaper article from June 20, 1764: “Leffingwell’s Bridge over Shetucket river at Norwich Landing [Connecticut] is completed. It is 124 feet in length and 28 feet above the water. Nothing is placed between the abutments, but the bridge is supported by Geometry work above, and calculated to bear a weight of 500 tons [sic]. The work is by Mr. John Bliss, one of the most curious mechanics of the age. The bridge was raised in two days and no one hurt. The former bridge [Edgerton’s bridge] was 28 days in raising” (1874: 348).
The Connecticut River, running between Vermont and New Hampshire, passes through an especially rugged gorge at Bellow’s Falls, Vermont. In 1785, Colonel Enoch Hale managed to construct a beam bridge supported by angle braces here that lasted until 1840, though no photographs of it are known. (NSPCB Archives, R. S. Allen Collection)
This scale model, believed to be John Bliss’s 1764 “Geometry Bridge,”also called Leffingwell’s Bridge, over the Shetucket River at Norwich, Connecticut, is kept at the Faith Trumbull Chapter of the Daughters of the American Revolution (DAR) house in Norwich. (Gerald Dyck)
Caulkins continues: “This bridge retained its position, and the proprietor was allowed a portion of the toll for fourteen years. But in 1777 it was much injured by floods, and the town having purchased Leffingwell’s remaining interest, united with Preston in petitioning the Legislature (May session, 1778) for leave to raise money by lottery for the erection of a new bridge. The petition was granted” (p. 348).
“Geometry bridge” suggests the use of a truss. Considering that Palladio’s work had been known after its translation into English was published in 1738, it is entirely possible that builders here and there were constructing at least modest spans, almost
