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Kirby Street over Flat Branch Trib B.

Manassas Park city, Virginia · rated Good in the 2025 National Bridge Inventory

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

Kirby Street over Flat Branch Trib B. in Manassas Park city, Virginia, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 2002, making it 23 years old at the 2025 inventory.
It carries about 1,400 vehicles a day (traffic count year 2021).
Its listed owner is a city or municipal highway agency.
It is one of 3 of the 3 inventoried bridges in Manassas Park city rated good (100.0%); 0 (0.0%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
It was rated fair in the 2024 inventory and is now good (culvert 6 to 7).
Its most recent inspection on record is dated April 2024, on a 24-month routine inspection cycle.
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

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Culvert	6	7	Good condition


Structure	Steel culvert
Length	about 25 ft
Location	160 South of Cabbel Dr.
NBI structure number	000000000031135
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	April 2024
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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

Bridge	Built	Vehicles/day	Condition
Manassas Drive over Russia Branch	1988	16,000	Good
Railroad Drive over Russia Branch Culvert 2	1992	3,200	Good