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Curbs
Timber

Rail Systems

Curbs

Not all trail bridges require rail systems. The designer should conduct an analysis of the bridge and determine whether a rail system is truly required or whether a curb could be installed instead. For example, if an analysis shows that the potential hazards along the trail are the same as or greater than the hazards of a bridge without a rail system, curbs may be used. The use of a curb to replace a rail system should be well documented and included in the design folder for the trail bridge. All trail bridges that do not have a rail system must have a curb.

Drawing of a curb system bridge.
Click image to enlarge

Timber

Timber-Log

Additional Pictures:

Standard Drawings/Design Aids:
Multiple Log Stringer R1921-3

Example sketch of a log timber curb
Photo of a Log Timber Curbs Photo of a Log Timber Curbs
ROS Classes: black from U to R to RN to SPM to SPNM to P

Timber-Sawn

Additional Pictures:

Standard Drawings/Design Aids:
Multiple Log Stringer R1921-3

Example sketch of a sawn timber curb
Photo of a Sawn Timber Curb Photo of a Sawn Timber Curb
ROS Classes: black from U to R to RN to SPM to SPNM, gray from SPNM to P