Home › Maryland › Calvert County › Md 4 over Patuxent River & Town CR

Md 4 over Patuxent River & Town CR

Calvert County, Maryland · rated Fair in the 2025 National Bridge Inventory

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

Md 4 over Patuxent River & Town CR in Calvert 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 5 (fair condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 28,338 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 18 of the 34 inventoried bridges in Calvert County rated fair (52.9%); 0 (0.0%) 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.

Component ratings


Structure	Continuous steel girder and floorbeam
Length	about 7,207 ft
Location	on St Marys Co Line
NBI structure number	100000040019010
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Md 2 SB over Hunting Creek	1992	46,798	Fair
Md 4 SB over Lyons Creek	1959	46,661	Fair
Md 4 NB over Lyons Creek	1987	46,661	Fair
Md 4 Nbr over Hall Creek	1966	35,171	Fair
Md 2 & 4 over Quaker Swamp	1987	27,798	Good
Md 2 & 4 over Johns Creek	1987	26,941	Fair