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Cooley Mill Road over Rock Run

Harford County, Maryland · rated Good in the 2025 National Bridge Inventory

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

Cooley Mill Road over Rock Run in Harford County, Maryland, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 1997, making it 28 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2019).
Its listed owner is the county highway agency.
It is one of 107 of the 276 inventoried bridges in Harford County rated good (38.8%); 12 (4.3%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 25 ft
Location	0.7 Mi SE of Rock Run Rd
NBI structure number	200000H-0020010
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-95 over Winters Run Rd Winters R	1963	161,591	Fair
I-95 over James Run	1963	130,492	Fair
I-95 over Grays Run	1963	116,162	Good
I-95 over Carsins Run	1963	100,386	Good
I-95 over Swan Creek	1963	100,386	Fair
I-95 over Md 462	1963	95,675	Fair