Md 4 over Kingston Creek

St. Mary's County, Maryland · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Md 4 over Kingston Creek in St. Mary's County, Maryland, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 1980, making it 45 years old at the 2025 inventory.
• It carries about 26,801 vehicles a day (traffic count year 2009).
• Its listed owner is the state highway agency.
• It is one of 35 of the 50 inventoried bridges in St. Mary's County rated fair (70.0%); 2 (4.0%) are rated poor.
• A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

View this bridge on a map → (38.31631, -76.49133)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.

Busiest bridges in St. Mary's County

All bridges nearby: St. Mary's County, MD bridge conditions · every bridge in St. Mary's County · Maryland bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.