County profile · official public datasets

Cobb County, GA

414 public highway bridges tracked in the FHWA National Bridge Inventory: 89.1% rated Good, 10.9% Fair, 0% Poor.

414
Public bridges
89.1%
Good condition
0%
Poor condition

The verdict

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

Cobb 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
414
public highway bridges
1987
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.

Cobb County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Cobb County ranks #1 of 159 Georgia counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Cobb County, Georgia contains 414 public highway bridges. Roughly 89.1% are rated “Good,” 10.9% “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

414

Public highway bridges in Cobb County

Good condition

89.1%

369 of 414 rated 7-9

Fair condition

10.9%

45 of 414 rated 5-6

Poor condition

0%

0 of 414 rated 4 or below

In-state Poor-share rank

#1 of 159

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

Condition distribution

Share of 414 NBI-tracked bridges by lowest applicable component rating.

Good
89.1% (369)
Fair
10.9% (45)
Poor
0% (0)

31.2% of Cobb County's bridges have passed the 50-year mark

129 of the 414 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 89.1% 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.

When Cobb County's bridges were built

414 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 89 of the county's bridges still in the inventory were built, which is 21.5% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1987, 10 years newer than the Georgia average of 1977.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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

The 5 Georgia counties nearest Cobb County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 1987 against a peer-group mean of 1979 is 8 years newer.

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

Bridge inventory size and condition shares for Cobb County and the 5 Georgia counties closest to it in inventory size
County Bridges Poor
Cobb County (this page) 414 0%
DeKalb County 392 1.5%
Gwinnett County 317 0%
Chatham County 265 1.1%
Bibb County 220 0%
Bartow County 219 2.3%

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 Cobb 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 Cobb County, both outside Georgia so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside GA (414 bridges here).

Similar average build year

Nearest mean year-built outside GA (1987 here).

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

All 414 Good 369 Fair 45 Poor 0

Good-condition bridges (369)

SR 5 (NBL)

Good

Over: I-75 + (1) I-75 RAMP

2 MI N OF MARIETTA, Cobb, GA

Built 1985 Load: 31.7 t ADT: 1,600

VILLA RICA ROAD

Good

Over: MUD CREEK TRIB

7.1 MI SW OF MARIETTA, Cobb, GA

Built 1984 Load: 31.7 t ADT: 5,750

CUMBERLAND PWY

Good

Over: CSX RAILROAD (340371X)

3.2 MI E OF SMYRNA, Cobb, GA

Built 1974 Load: 31.7 t ADT: 8,673

EAST-WEST CONN

Good

Over: NICKAJACK CREEK

3 MI SW OF SYRMNA, Cobb, GA

Built 1997 Load: 31.7 t ADT: 29,100

JILES ROAD

Good

Over: CSX RAILROAD

1.5 MI N OF KENNESAW, Cobb, GA

Built 2010 Load: 31.7 t ADT: 27,400

CAMPBELL ROAD

Good

Over: CSX RAILROAD

3 MILES SOUTH OF MARIET, Cobb, GA

Built 2012 Load: 31.7 t ADT: 6,650

NEW CHASTAIN RD WB

Good

Over: NOONDAY CREEK

4 MI E OF KENNESAW, Cobb, GA

Built 2013 Load: 31.7 t ADT: 19,200

SWEETWATER AVE

Good

Over: POWDER SPRINGS CREEK

IN POWDER SPRINGS, Cobb, GA

Built 2006 Load: 31.7 t ADT: 2,004

STOUT PARKWAY

Good

Over: GOTHARDS CREEK

3.7 MI W OF AUSTELL, Cobb, GA

Built 2014 Load: 31.7 t ADT: 2,004

I-575 MANAGED LANE

Good

Over: HAWKINS STORE ROAD

5 MI NE OF KENNESAW, Cobb, GA

Built 2015 Load: 31.7 t ADT: 970

ATLANTA ROAD

Good

Over: I-285

3.5 MI SE OF SMYRNA, Cobb, GA

Built 2017 Load: 31.7 t ADT: 2,380

SR 120 LOOP

Good

Over: SOPE CREEK

2.4 MI E OF MARIETTA, Cobb, GA

Built 1969 Load: 32.6 t ADT: 23,710

SR 120 LOOP

Good

Over: SOPE CREEK

3 MI E OF MARIETTA, Cobb, GA

Built 1969 Load: 32.6 t ADT: 23,710

MARS HILL ROAD

Good

Over: ALLATOONA CREEK

3.7 MI S OF ACWORTH, Cobb, GA

Built 1967 Load: 32.6 t ADT: 11,200

BOOTH ROAD

Good

Over: SR 417 (I-575)

3 MI NE OF KENNESAW, Cobb, GA

Built 1979 Load: 32.6 t ADT: 8,680

SR 360

Good

Over: MUD CREEK

3 MI NE OF POWDER SPGS, Cobb, GA

Built 1971 Load: 32.6 t ADT: 31,600

SR 360

Good

Over: NOSES CREEK

3.4 MI NE POWDER SPRGS, Cobb, GA

Built 1971 Load: 32.6 t ADT: 31,600

I-75

Good

Over: I-285 RAMP CBL CD

6.7 MI SE OF MARIETTA, Cobb, GA

Built 1963 Load: 32.6 t ADT: 147,000

I-75

Good

Over: ROTTENWOOD CREEK

IN SOUTH EAST MARIETTA, Cobb, GA

Built 1965 Load: 32.6 t ADT: 254,000

I-575 (NBL)

Good

Over: M-9020 BELLS FERRY ROAD

4 MI NE OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 89,100

I-575 (SBL)

Good

Over: M-9020 BELLS FERRY ROAD

4 MILES NE OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 23,000

I-575 (NBL)

Good

Over: CR 646 HAWKINS STORE RD.

5 MI NE OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 89,100

I-575 (SBL)

Good

Over: CR 646 HAWKINS STORE RD.

5 MI NE OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 23,000

SHALLOWFORD ROAD

Good

Over: SR 417 (I-575)

5.3 MI NE OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 14,200

CHASTAIN ROAD

Good

Over: SR 417 (I-575)

3.2 MI E OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 17,600

WINDY HILL ROAD

Good

Over: I-75 - I-75 RAMP

3.5 MI NE OF SMYRNA, Cobb, GA

Built 1980 Load: 32.6 t ADT: 27,900

WINDY HILL ROAD

Good

Over: ROTTENWOOD CREEK

3.7 MI NE OF SMYRNA, Cobb, GA

Built 1980 Load: 32.6 t ADT: 27,900

SR 5

Good

Over: M-9019 + CSX RR (351808J

1.5 MI N OF MARIETTA, Cobb, GA

Built 1985 Load: 32.6 t ADT: 43,700

I-285R TO I-75 NB

Good

Over: I-75R TO WINDY HILL RD.

0.9 N OF I-285 & I-75 INT, Cobb, GA

Built 1985 Load: 32.6 t ADT: 84,400

US 278 / SR 6

Good

Over: POWDER SPRINGS CREEK

2.4 MILES NORTH WEST OF A, Cobb, GA

Built 1983 Load: 32.6 t ADT: 33,400

BARRETT PARKWAY

Good

Over: NOONDAY CREEK TRIB.

4.5 MI N OF MARIETTA, Cobb, GA

Built 1979 Load: 32.6 t ADT: 24,500

I-75R FROM WINDY H

Good

Over: I-75 RAMP TO I-285

0.87 NW I-75 & I-285 INT, Cobb, GA

Built 1985 Load: 32.6 t ADT: 23,900

I-75 RAMP TO I-285

Good

Over: I-285- I-75- 3 RAMPS

I-285 & I-75 INTERCHANGE, Cobb, GA

Built 1986 Load: 32.6 t ADT: 40,900

I-75 R TO I-285 WB

Good

Over: I-285 CD WEST BOUND

I-285 & I-75 INTERCHANGE, Cobb, GA

Built 1986 Load: 32.6 t ADT: 36,200

SR 120 LOOP

Good

Over: SOPE CREEK

0.8 MI W SR 120L & I-75 I, Cobb, GA

Built 1985 Load: 32.6 t ADT: 18,800

OLD CANTON ROAD

Good

Over: SOPE CREEK TRIB.

5.5 MI NE OF MARIETTA, Cobb, GA

Built 1987 Load: 32.6 t ADT: 8,170

HIGHLAND PARKWAY

Good

Over: NICKAJACK CREEK TRIB.

4 MI S OF SMYRNA, Cobb, GA

Built 1983 Load: 32.6 t ADT: 15,105

KENNESAW AVENUE

Good

Over: SR 5

IN MARIETTA CITY LIMITS, Cobb, GA

Built 1989 Load: 32.6 t ADT: 7,880

US 278/ SR 6

Good

Over: POWDER SPRINGS CREEK

WEST POWDER SPRINGS, Cobb, GA

Built 1990 Load: 32.6 t ADT: 36,100

PINE MOUNTAIN RD

Good

Over: BUTLER CREEK

1 MI SW OF KENNESAW, Cobb, GA

Built 1980 Load: 32.6 t ADT: 8,673

ROBERTS BLVD

Good

Over: NOONDAY CREEK

1.8 MI SE OF KENNESAW, Cobb, GA

Built 1986 Load: 32.6 t ADT: 9,450

TRICKUM ROAD

Good

Over: RUBES CREEK TRIB.

8 MI NE OF KENNESAW, Cobb, GA

Built 1993 Load: 32.6 t ADT: 9,240

POST OAK TRITT ROA

Good

Over: WILLEO CREEK

9.7 MI NE OF MARIETTA, Cobb, GA

Built 1983 Load: 32.6 t ADT: 7,460

WESLEY CHAPEL ROAD

Good

Over: SWEAT MOUNTAIN CREEK

9.5 MI NE OF MARIETTA, Cobb, GA

Built 1986 Load: 32.6 t ADT: 2,300

LOCH HIGHLAND PARK

Good

Over: SWEAT MOUNTAIN CREEK

10 MI NE OF ELIZABETH, Cobb, GA

Built 1977 Load: 32.6 t ADT: 370

JACKSON WAY

Good

Over: HUNTER BRANCH

IN W POWDER SPRINGS, Cobb, GA

Built 1980 Load: 32.6 t ADT: 2,004

COUNTY SERVICES PA

Good

Over: OLLEY CREEK

3.9 MI SW OF MARIETTA, Cobb, GA

Built 1992 Load: 32.6 t ADT: 6,750

SANDTOWN ROAD

Good

Over: OLLEY CREEK

2.2 MI S OF MARIETTA, Cobb, GA

Built 1995 Load: 32.6 t ADT: 12,100

HUNTINGFORD DR

Good

Over: WILLEO CREEK TRIB.

9.2 MI E OF MARIETTA, Cobb, GA

Built 1973 Load: 32.6 t ADT: 2,004

MILFORD CH ROAD

Good

Over: OLLEY CREEK

4.3 MI W OF SMYRNA, Cobb, GA

Built 1993 Load: 32.6 t ADT: 2,004

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.