The Stone Arch Bridges of the Pilot Management Plan are:

• Located in Bucks, Chester, Delaware, Montgomery or Philadelphia Counties
• 20 feet or longer (as measured by the arch opening)
• Used for vehicular traffic (but not for trains)

Project Keystone is a bridge management plan focused on the 124 examples with spans of 20 feet or more (shorter spans are primarily culverts). It provides a comprehensive treatment of these particular bridges and facilitates decisions about them as a group rather than on an individual basis.

The Plan has three components:

1. The development of criteria for prioritizing the bridges according to their suitability for preservation.
2. Recommendations for maintenance procedures and the development of a program to carry out regular maintenance on those bridges selected for preservation.
3. A system for monitoring and updating the Plan.

The goal is to produce sound management recommendations for each bridge and integrate them into PENNDOT's transportation improvement and maintenance planning and procedures.