County profile · official public datasets

Gwinnett County, GA

317 public highway bridges tracked in the FHWA National Bridge Inventory: 89.3% rated Good, 10.7% Fair, 0% Poor.

317
Public bridges: 89.3%
Good condition: 0%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Gwinnett County pairs a top-1% lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 1%
lowest Poor share in state: 0%
Poor-condition share: 317
public highway bridges: 1989
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Gwinnett County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Gwinnett County ranks #2 of 159 Georgia counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Gwinnett County, Georgia contains 317 public highway bridges. Roughly 89.3% are rated “Good,” 10.7% “Fair,” and 0% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

317

Public highway bridges in Gwinnett County

Good condition

89.3%

283 of 317 rated 7-9

Fair condition

10.7%

34 of 317 rated 5-6

Poor condition

0 of 317 rated 4 or below

In-state Poor-share rank

#2 of 159

Among Georgia counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 317 NBI-tracked bridges by lowest applicable component rating.

Good

89.3% (283)

Fair

10.7% (34)

Poor

0% (0)

21.1% of Gwinnett County's bridges have passed the 50-year mark

67 of the 317 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 89.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1920s

3
1930s

4
1940s

2
1950s

11
1960s

31
1970s

27
1980s

59
1990s

92
2000s

35
2010s

46
2020s

6

What this shows Construction peaked in the 1990s, when 92 of the county's bridges still in the inventory were built, which is 29% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1989, 12 years newer than the Georgia average of 1977.

How Gwinnett County compares with Georgia's closest counties by inventory size

The 5 Georgia counties nearest Gwinnett County in number of bridges, with their condition splits. Its 0% Poor share is the 2nd-lowest of these 6. Its average build year of 1989 against a peer-group mean of 1979 is 10 years newer.

Showing the 5 closest of 158 Georgia counties eligible for comparison.

Bridge inventory size and condition shares for Gwinnett County and the 5 Georgia counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Cobb County	414	89.1%	10.9%	0%	1987
DeKalb County	392	73.7%	24.7%	1.5%	1971
Gwinnett County (this page)	317	89.3%	10.7%	0%	1989
Chatham County	265	75.8%	23%	1.1%	1985
Bibb County	220	76.4%	23.6%	0%	1974
Bartow County	219	67.1%	30.6%	2.3%	1977

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Gwinnett County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Gwinnett County, both outside Georgia so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside GA (317 bridges here).

Cherokee County, KS · 317 bridges
St. Landry County, LA · 317 bridges
Washington County, MS · 317 bridges
Van Wert County, OH · 317 bridges

Similar average build year

Nearest mean year-built outside GA (1989 here).

Harris County, TX · avg 1989 · 4,029 bridges
Mecklenburg County, NC · avg 1989 · 746 bridges
Buffalo County, NE · avg 1989 · 459 bridges
Brazos County, TX · avg 1989 · 370 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 317 Good 283 Fair 34 Poor 0

Good-condition bridges (283)

Sort:

Gwinnett County Bridge Snapshot

Condition distribution

21.1% of Gwinnett County's bridges have passed the 50-year mark

How Gwinnett County compares with Georgia's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (283)

SR 20 EASTBOUND

SUGARLOAF PKWY N/B

I-85 SOUTHBOUND

NEW HOPE ROAD

SR 316 (WBL)

I-85 (NBL)

I-85 (SBL)

LEE ROAD

SUGARLOAF PKWY S/B

I-85 NBCD

SATELLITE BLVD

SUGARLOAF PKY (NBL

SUGARLOAF PKY (SBL

SR 316 EASTBOUND

WALTHER BLVD

KILLIAN HILL RD

SUGARLOAF PKY (SB)

SPOUT SPRINGS ROAD

HARBINS ROAD

I-85 NBL

SR 316 (EBL)

RONALD REAGAN PKWY

SR 317

BRECKINRIDGE BLVD

316 HOV EB

HIRAM DAVIS ROAD

MT GRAVEL SPRINGS

CRUSE ROAD

SUGARLOAF PARKWAY

SUGARLOAF PKY (NB)

WHITEHEAD ROAD

SR 316 EB

ARCADO ROAD

SUGARLOAF PKY (SBL

SUGARLOAF PARKWAY

US 29/ SR 8

PLEASANT HILL RD N

PTREE IND S/B

SUGARLOAF PKY (NB

OLD FOUNTAN DRIVE

HARBINS ROAD

HARBINS ROAD

SR 316 - US 29 EBL

SR 316 - US 29 (WB

MARTINS CHAPEL RD

GARNER ROAD

FLOWERY BRANCH RD

SPRINGDALE ROAD

DULUTH HWY (SR120)

THOMPSON MILL ROAD

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