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First Street over Rock Creek Tributary

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

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

First Street over Rock Creek Tributary in Montgomery County, Maryland, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2017, making it 8 years old at the 2025 inventory.
It carries about 3,496 vehicles a day (traffic count year 2021).
Its listed owner is a city or municipal highway agency.
It is one of 205 of the 522 inventoried bridges in Montgomery County rated good (39.3%); 25 (4.8%) 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

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

Bridge	Built	Vehicles/day	Condition
Is 270 over Old Farm Creek	1958	265,320	Fair
Is 270 over Tuckerman Lane	1958	265,320	Fair
Is 495 over Stoney Brook Dr Rock CR	1964	242,821	Fair
Is 495 over Md 650	1963	242,500	Fair
Is 270 & Cd Rds over Watts Branch	1955	239,460	Fair
Is 495 over Md 185	1964	239,310	Fair