Bridge Data
The following table is a comparison of published measurements of length, width and load recorded in five different sources using different methods, as well as the name or names cited. The NBI measures bridge length between the "backwalls of abutments" or pavement grooves and the roadway width as "the most restrictive minimum distance between curbs or rails". The NRHP form was prepared by the Pennsylvania Historical and Museum Commission (PHMC), which surveyed county engineers, historical and covered bridge societies, and others for all the covered bridges in the commonwealth. The Evans visited every covered bridge in Pennsylvania in 2001 and measured each bridge's length (portal to portal) and width (at the portal) for their book. The data in Zacher's book was based on a 1991 survey of all covered bridges in Pennsylvania by the PHMC and the Pennsylvania Department of Transportation, aided by local government and private agencies. The article uses primarily the NBI and NRHP data, as they are national programs.
| Length feet (m) |
Width feet (m) |
Load short tons (MT) |
Name(s) used |
Source (Year) |
|---|---|---|---|---|
| 95 feet (29.0 m) | 17 feet 6 inches (5.3 m) | 3.0 short tons (2.7 t) | Larrys Creek, Cogan House | Landis (1966, 1981) |
| 94 feet 2 inches (28.7 m) | 14 feet 5 inches (4.4 m) | 7.2 short tons (6.5 t) | Cogan House | NBI (2009) |
| 93 feet (28.3 m) | 19 feet 7 inches (6.0 m) | 4.0 short tons (3.6 t) | Cogan House | NRHP (1980) |
| 91 feet 10 inches (28.0 m) | 17 feet 3 inches (5.3 m) | NA | Cogan House, Buckhorn | Evans (2001) |
| 81 feet (24.7 m) | 19 feet 7 inches (6.0 m) | NA | Cogan House | Zacher (1994) |
Read more about this topic: Cogan House Covered Bridge
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