The Baltimore and Ohio Railroad's Guilford Pratt Truss Bridge spans the Little Patuxent River along Old Guilford Road. The 1902 bridge represents two industries of importance to Howard County, railroading and granite quarrying.

The B&O's legacy is well known. Part of that legacy is its experimentation with and use of new bridge designs, such the Pratt Truss, patented in 1844, according to the United States National Park Service Historic American Engineering Record. Maryland was home to America's only granite production outside of New England in the early nineteenth century, and by 1890 granite production in the state had increased to 23 active quarries, according to the 1971 official Maryland Hall of Records Commission state history, The Old Line State.

The bridge is relatively secure, except for a missing roadbed, but is vulnerable to further deterioration and vandalism. PHC will continue to support and encourage Howard County's plans for the adaptive reuse of the bridge as an integral part of its planned Spinal Pathway System, connecting the historic town of Savage and Lake Elkhorn in Columbia.

Update
In 2001, the bridge was relatively secure, except for a missing roadbed, but was vulnerable to further deterioration and vandalism. PHC met its goals to support and encourage Howard County's plans for the adaptive reuse of the bridge as an integral part of its planned Spinal Pathway System. Funding was designated for this project in 2001, and soon the bridge will be part of a system that connects the historic town of Savage to Lake Elkhorn in the "New Town" of Columbia.