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Single Unit
Foot Log
Laminated Timber
Prestressed Concrete
Covered Bridges

Types

Single Unit

Single unit bridges are bridges in which the bridge is a single, self-supporting unit.

Current standard trail bridge designs are available on the USDA Forest Service Standard Trail Plans and Specifications web page (scroll down to section 960-Trail Bridges).

Foot Log

Typical span 10 to 40 feet

Additional Pictures:

Standard Drawings/Design Aids:
Single Log Stringer Trail Bridge

Example sketch foot log single unit Photo of a Foot Log Single Unit
ROS Classes: black from U to R to RN to SPM to SPNM to P

Nailed- or Glued-Laminated Timber

Typical span 10 to 40 feet

Additional Pictures:

Example sketch of nail laminated timber
Photo of Nail Laminated Timber Photo of Laminated Timber
ROS Classes: black from U to R to RN to SPM to SPNM, gray from SPNM to P

Prestressed Concrete

Typical span 30 to 120 feet

Additional Pictures:

Example sketch of pre-stressed concrete
Example sketch of pre-stressed concrete
Photo of Pre-Stressed Concrete
ROS Classes: black from U to R, gray from R to RN, white from RN to SPM to SPNM to P