County profile · official public datasets

St. Johns County, FL

141 public highway bridges tracked in the FHWA National Bridge Inventory: 61% rated Good, 37.6% Fair, 1.4% Poor.

141
Public bridges: 61%
Good condition: 1.4%
Poor condition

The verdict

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

St. Johns County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 36%
lowest Poor share in state: 1.4%
Poor-condition share: 141
public highway bridges: 1988
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.

St. Johns County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, St. Johns County ranks #24 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.4%). St. Johns County, Florida contains 141 public highway bridges. Roughly 61% are rated “Good,” 37.6% “Fair,” and 1.4% “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

141

Public highway bridges in St. Johns County

Good condition

61%

86 of 141 rated 7-9

Fair condition

37.6%

53 of 141 rated 5-6

Poor condition

1.4%

2 of 141 rated 4 or below

In-state Poor-share rank

#24 of 67

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

Condition distribution

Share of 141 NBI-tracked bridges by lowest applicable component rating.

Good

61% (86)

Fair

37.6% (53)

Poor

1.4% (2)

St. Johns County's Poor-condition bridges carry 63,500 vehicle crossings a day

That is 2.2% of the county's reported daily bridge traffic on 1.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 31,750 crossings a day against 18,895 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 141 of 141 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

38.3% of St. Johns County's bridges have passed the 50-year mark

54 of the 141 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 61% 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 74% of the county's Poor-condition bridge traffic

US-1 (SR-5) over OYSTER CREEK, built 1958, carries 47,000 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 2-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 63,500 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1930s

1
1940s

3
1950s

8
1960s

37
1970s

9
1980s

6
1990s

16
2000s

27
2010s

28
2020s

4

What this shows Construction peaked in the 1960s, when 37 of the county's bridges still in the inventory were built, which is 26.2% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1988, 5 years newer than the Florida average of 1983.

How St. Johns County compares with Florida's closest counties by inventory size

The 5 Florida counties nearest St. Johns County in number of bridges, with their condition splits. Its 1.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1988 against a peer-group mean of 1985 is in line with the group.

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

Bridge inventory size and condition shares for St. Johns County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Pasco County	151	81.5%	17.2%	1.3%	1994
St. Lucie County	151	74.8%	22.5%	2.6%	1981
Jackson County	146	21.2%	71.2%	7.5%	1982
St. Johns County (this page)	141	61%	37.6%	1.4%	1988
Bay County	130	30.8%	59.2%	10%	1984
Martin County	129	72.9%	26.4%	0.8%	1983

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

Similar inventory size

Nearest county inventories outside FL (141 bridges here).

Petersburg County, AK · 141 bridges
Renville County, MN · 141 bridges
Warren County, NY · 141 bridges
Geauga County, OH · 141 bridges

Similar average build year

Nearest mean year-built outside FL (1988 here).

Travis County, TX · avg 1988 · 1,544 bridges
Grant County, OK · avg 1988 · 476 bridges
Loudoun County, VA · avg 1988 · 442 bridges
Licking County, OH · avg 1988 · 439 bridges

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

All 141 Good 86 Fair 53 Poor 2

All bridges (141)

Sort:

St. Johns County Bridge Snapshot

Condition distribution

St. Johns County's Poor-condition bridges carry 63,500 vehicle crossings a day

38.3% of St. Johns County's bridges have passed the 50-year mark

One structure carries 74% of the county's Poor-condition bridge traffic

How St. Johns County compares with Florida's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (141)

CR 210

SR 9B SB

SR 9B NB

SR-207

CR 2209

US-1 SB (SR-5)

US-1 NB (SR-5)

Silverlake Dr.

SR-312

US-1 (SR-5)

US-1 SB (SR-5)

VALLEY RIDGE BLVD

Conservation Trail

PABLO ROAD

CR 13A

NOCATEE PKWY WB

NOCATEE PKWY EB

CR 13

SR-A1A

SR-13/16

CR 2209

SR-A1A

SR-16

SR-207

SR-207 S.B.

SR-207 N.B.

MOON BAY PARKWAY

CR 244

SR-312 WB

RUTILE DRIVE

COWPEN BRANCH ROAD

LAKE ROAD

Kendall Crossing

West Peyton Pkwy

I-95NB RAMP (SR-9)

ST JOHNS PKWY

I-95 (SR-9)

I-95 RAMP (SR-9)

GEORGE MILLER ROAD

US-1 (SR-5)

US-1 BUS. & SR-5A

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