| Y/M/D | Description | Place |
|---|---|---|
| 1805/01/01 | America's first covered bridge, the Schuylkill Permanent Bridge, opens at High (now Market) Street in Philadelphia, carrying the road over the Schuylkill River. Built by Timothy Palmer from 1804-1805, it was destroyed by fire on 20 November 1875. | |
| 1810/00/00 | By 1810, covered bridges are common across southern New England, southeastern New York, Pennsylvania and New Jersey, spreading outward as the form moved north, south and west into the expanding American landscape. | |
| 1829/08/00 | Stephen Long patents a wooden truss system notable for strength, permanence and easy repair, allowing damaged timbers to be replaced without dismantling the entire structure. | |
| 1829/08/00 | Jackson Covered Bridge is erected to carry the Baltimore-Washington Pike over the B and O Railroad in Baltimore. Replaced c 1870, it became the first US railway grade-separation crossing and began the shift from masonry to timber-truss spans. |
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