Structure 6568 · Fairfax County, VA

I-495 over Ns Railway

Carries I-495 over Ns Railway, 1.13 Fr 95 & 1.71 To 620.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT283 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

283 ft end to end, longest span 108 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built1961rebuilt 2002
Length283.1 ft86.3 m
Daily traffic227,699counted 2022
Last inspectedMarch 2024every 24 months

Location

StateVirginia
CountyFairfax
Location1.13 Fr 95 & 1.71 To 620
CarriesI-495
CrossesNs Railway
Coordinates38.79709, -77.19338

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length283.1 ft (86.3 m)
Max Span107.9 ft (32.9 m)
Deck Width217.8 ft (66.4 m)
Deck Area5730.3 sq m
Main Spans3
Year Built1961 (reconstructed 2002)

Traffic

Avg Daily Traffic227,699 (2022)
Truck Traffic1%
Lanes On Bridge14

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000006568

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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