County profile · official public datasets

Nassau County, FL

104 public highway bridges tracked in the FHWA National Bridge Inventory: 49% rated Good, 48.1% Fair, 2.9% Poor.

104
Public bridges
49%
Good condition
2.9%
Poor condition

The verdict

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

Nassau County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

40th
of 67 on Poor share
2.9%
Poor-condition share
104
public highway bridges
1977
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.

Nassau County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Nassau County ranks #40 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.9%). Nassau County, Florida contains 104 public highway bridges. Roughly 49% are rated “Good,” 48.1% “Fair,” and 2.9% “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

104

Public highway bridges in Nassau County

Good condition

49%

51 of 104 rated 7-9

Fair condition

48.1%

50 of 104 rated 5-6

Poor condition

2.9%

3 of 104 rated 4 or below

In-state Poor-share rank

#40 of 67

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

Condition distribution

Share of 104 NBI-tracked bridges by lowest applicable component rating.

Good
49% (51)
Fair
48.1% (50)
Poor
2.9% (3)

Nassau County's Poor-condition bridges carry 2,561 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 2.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 854 crossings a day against 9,645 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 104 of 104 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

51.9% of Nassau County's bridges have passed the 50-year mark

54 of the 104 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 49% 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.

One structure carries 93.7% of the county's Poor-condition bridge traffic

CR 121 over DEEP CREEK, built 1949, carries 2,400 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 3-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 2,561 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Nassau County's bridges were built

104 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 19 of the county's bridges still in the inventory were built, which is 18.3% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1977, 6 years older than the Florida average of 1983.

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

How Nassau County compares with Florida's closest counties by inventory size

The 5 Florida counties nearest Nassau County in number of bridges, with their condition splits. Its 2.9% Poor share is the 4th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1981 is in line with the group.

Showing the 5 closest of 66 Florida counties eligible for comparison.

Bridge inventory size and condition shares for Nassau County and the 5 Florida counties closest to it in inventory size
County Bridges Poor
Columbia County 112 0.9%
Sumter County 112 0%
Flagler County 105 1.9%
Nassau County (this page) 104 2.9%
Monroe County 100 7%
Washington County 99 10.1%

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

Similar inventory size

Nearest county inventories outside FL (104 bridges here).

Similar average build year

Nearest mean year-built outside FL (1977 here).

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

All 104 Good 51 Fair 50 Poor 3

All bridges (104)

CR 121

Good

Over: BRANCH OF DEEP CREEK

0.9 MI NORTH OF US 90, Nassau, FL

Built 1950 Load: 25.2 t ADT: 3,000

CR 115

Good

Over: DUNN CREEK

0.5 MI EAST OF CR 121, Nassau, FL

Built 1950 Load: 29.0 t ADT: 1,500

CR-108

Good

Over: I-95 (SR-9)

CR-108 / I-95, Nassau, FL

Built 1968 Load: 30.4 t ADT: 3,400

US-90 (SR-10)

Good

Over: DEEP CREEK

US-90 / DEEP CREEK, Nassau, FL

Built 2001 Load: 30.7 t ADT: 5,400

I-95 SB (SR-9)

Good

Over: SR-A1A & SR-200

I-95 SB OVER SR-A1A, Nassau, FL

Built 1967 Load: 31.0 t ADT: 28,250

I-95 NB (SR-9)

Good

Over: SR-A1A & SR-200

I-95 NB OVER SR-A1A, Nassau, FL

Built 1967 Load: 31.0 t ADT: 28,250

A.E. BELL BRIDGE

Good

Over: ST. MARYS RIVER

1 MI E OF ST GEORGE, Nassau, FL

Built 2001 Load: 32.4 t ADT: 2,070

US-1 NB (SR-15)

Good

Over: BRANCH OF MILLS CREEK

5.5 MI. N. OF CALLAHAN, Nassau, FL

Built 1956 Load: 32.7 t ADT: 7,850

SR-200 & A1A

Good

Over: MILLS CREEK

0.9 MI. E. OF US-1, Nassau, FL

Built 2011 Load: 33.0 t ADT: 12,900

SR-200 and A1A

Good

Over: LOFTON CREEK

SR-200 / LOFTON CREEK, Nassau, FL

Built 2019 Load: 33.7 t ADT: 45,500

SR-A1A & SR-200

Good

Over: NANN SWAMP

3.8 MI. W. OF I-95, Nassau, FL

Built 1936 Load: 33.9 t ADT: 20,500

US-301 (SR-200) SB

Good

Over: BRANDY BRANCH NORTH

SR-200 & CR-119, Nassau, FL

Built 2015 Load: 34.1 t ADT: 4,150

US-301 (SR-200) NB

Good

Over: BRANDY BRANCH NORTH

SR-200 & CR-119, Nassau, FL

Built 2015 Load: 34.1 t ADT: 4,150

US-1 NB (SR-15)

Good

Over: LITTLE BOGGY CREEK

1.09 MI. S. OF CR-108, Nassau, FL

Built 1956 Load: 34.3 t ADT: 6,800

US-1 NB (SR-15)

Good

Over: PIGEON CREEK

1.3 MI. S. OF GA. LINE, Nassau, FL

Built 1956 Load: 34.3 t ADT: 6,650

SR-200 & SR-A1A EB

Good

Over: BOGGY CREEK

6 MI. E. OF CALLAHAN, Nassau, FL

Built 2011 Load: 34.3 t ADT: 6,450

SR-200 & SR-A1A WB

Good

Over: Boggy Creek

6 MI E OF CALLAHAN, Nassau, FL

Built 2012 Load: 34.3 t ADT: 6,450

US-301 (SR-200) SB

Good

Over: FUNKS CREEK

2 MI. S. OF US-1, Nassau, FL

Built 2015 Load: 34.4 t ADT: 4,150

US-301 (SR-200) NB

Good

Over: FUNKS CREEK

2 MI. S. OF US-1, Nassau, FL

Built 2015 Load: 34.4 t ADT: 4,150

I-95 NB (SR-9)

Good

Over: US-17 (SR-5)

I-95 NB / US-17, Nassau, FL

Built 1968 Load: 36.2 t ADT: 28,250

I-95 SB (SR-9)

Good

Over: US-17 (SR-5)

I-95 SB / US-17, Nassau, FL

Built 1968 Load: 36.2 t ADT: 28,250

GRIFFIN ROAD

Good

Over: SPELL SWAMP

1.8M E OF MUSSEL WHITE RD, Nassau, FL

Built 2004 Load: 36.4 t ADT: 1,300

US-301 (SR-200)

Good

Over: CSXRR

US-301/CSXRR IN CALLAHAN, Nassau, FL

Built 2000 Load: 37.6 t ADT: 6,700

US-301 (SR-200) SB

Good

Over: BRANCH OF THOMAS CREEK

US-301/ BR. THOMAS CREEK, Nassau, FL

Built 2015 Load: 37.9 t ADT: 4,150

US-301 (SR-200) NB

Good

Over: BRANCH OF THOMAS CREEK

US-301/ BR. THOMAS CREEK, Nassau, FL

Built 2015 Load: 37.9 t ADT: 4,150

I-95 SB (SR-9)

Good

Over: TIDE CREEK

2.2 MI. S. OF SR-A1A, Nassau, FL

Built 1967 Load: 38.1 t ADT: 28,250

I-95 NB (SR-9)

Good

Over: TIDE CREEK

2.2 MI. S. OF SR-A1A, Nassau, FL

Built 1967 Load: 38.1 t ADT: 28,250

LESSIE ROAD

Good

Over: LITTLE ST MARY RIVER

0.8 MI NORTH OF CR 108, Nassau, FL

Built 2011 Load: 38.6 t ADT: 400

US-301(SR-200) SB

Good

Over: BRANDY BRANCH SOUTH

SR-200 & CR-119, Nassau, FL

Built 2015 Load: 39.2 t ADT: 4,150

US-301 (SR-200) NB

Good

Over: BRANDY BRANCH SOUTH

SR-200 & CR-119, Nassau, FL

Built 2015 Load: 39.2 t ADT: 4,150

MURRHEE ROAD

Good

Over: LITTLE ST MARYS RIVER

2.1 MI NORTHEAST OF US 1, Nassau, FL

Built 1998 Load: 40.2 t ADT: 1,451

US-301 (SR-200) SB

Good

Over: NORFOLK S RR

5 MI. S. OF CALLAHAN, Nassau, FL

Built 2015 Load: 41.8 t ADT: 4,150

US-301 (SR-200) NB

Good

Over: NORFOLK S RR

5 MI. S OF CALLAHAN, Nassau, FL

Built 2015 Load: 41.8 t ADT: 4,150

SR-A1A & SR-200

Good

Over: PLUMMER CREEK

1 MI. W OF I-95, Nassau, FL

Built 2007 Load: 41.8 t ADT: 20,500

US-1 (SR-15)

Good

Over: ALLIGATOR CREEK

CALLAHAN N. CITY LIMITS, Nassau, FL

Built 1992 Load: 42.6 t ADT: 15,200

US-17 (SR-5)

Good

Over: MCQUEEN SWAMP

4.9 MI. N. OF YULEE, Nassau, FL

Built 2002 Load: 42.7 t ADT: 4,300

CR107 BLACKROCK RD

Good

Over: LANCEFORD CREEK

0.9 MI NORTH OF SR 200, Nassau, FL

Built 2014 Load: 42.8 t ADT: 1,900

US-301 (SR-200)

Good

Over: BRANCH OF FUNKS CREEK

3.2 MI. S. OF US-1, Nassau, FL

Built 2015 Load: 46.1 t ADT: 8,300

US-1 SB (SR-15)

Good

Over: PIGEON CREEK

1.3 MI. S. OF GA. LINE, Nassau, FL

Built 1998 Load: 47.0 t ADT: 6,650

CR 200A

Good

Over: Lofton Creek

2 Mi East of US 17, Nassau, FL

Built 2022 Load: 47.0 t ADT: 10,400

CR 115

Good

Over: Little Mills Creek

1.3 Mi Northwest of US 1, Nassau, FL

Built 2022 Load: 47.4 t ADT: 2,500

US-1 SB (SR-15)

Good

Over: CUSHING CREEK

2.8 MI. N. OF DUVAL CO., Nassau, FL

Built 1998 Load: 48.9 t ADT: 8,050

US-1 NB (SR-15)

Good

Over: CUSHING CREEK

2.8 MI. N. OF DUVAL CO., Nassau, FL

Built 1998 Load: 48.9 t ADT: 8,050

US-1 SB (SR-15)

Good

Over: LITTLE MILLS CREEK

0.8 MILE N. OF US-301, Nassau, FL

Built 1998 Load: 48.9 t ADT: 7,850

US-1 NB (SR-15)

Good

Over: LITTLE MILLS CREEK

0.8 MILE N. OF US-301, Nassau, FL

Built 1998 Load: 48.9 t ADT: 7,850

CR 121

Good

Over: BRANDY BRANCH

3.3 MI SOUTH OF CR 119, Nassau, FL

Built 2001 Load: 52.8 t ADT: 3,000

CR 121

Good

Over: MILL CREEK

3 MI NORTH OF CR 2, Nassau, FL

Built 2001 Load: 53.0 t ADT: 2,400

US-17 (SR-5)

Good

Over: BRANCH OF LOFTON CREEK

1.7 MI. N. OF SR-A1A, Nassau, FL

Built 2001 Load: 53.9 t ADT: 14,000

SR-105 & SR-A1A

Good

Over: NASSAU SOUND

10 MI. S. OF FERNANDINA, Nassau, FL

Built 1999 Load: 55.7 t ADT: 5,000

US-301 (SR-200)

Good

Over: FUNKS CREEK BRANCH NORTH

13.8 MI. N. OF US-90, Nassau, FL

Built 2015 Load: 62.4 t ADT: 8,300

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.