Structure 13500290 · Gwinnett County, GA

Thompson Mill Road over SR 419 (i-985 US 23)

Carries Thompson Mill Road over SR 419 (i-985 US 23), 1.3 Mi E Of Buford.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT234 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

234 ft end to end, longest span 74 ft: about 3 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.

Built196858 years old
Length233.9 ft71.3 m
Daily traffic10,400counted 2024
Last inspectedOctober 2023every 24 months

Location

StateGeorgia
CountyGwinnett
Location1.3 Mi E Of Buford
CarriesThompson Mill Road
CrossesSR 419 (i-985 US 23)
Coordinates34.11985, -83.97086

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length233.9 ft (71.3 m)
Max Span74.1 ft (22.6 m)
Deck Width34.8 ft (10.6 m)
Deck Area755.8 sq m
Main Spans4
Year Built1968

Traffic

Avg Daily Traffic10,400 (2024)
Truck Traffic1%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000013500290

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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