County profile · official public datasets

St. Lucie County, FL

151 public highway bridges tracked in the FHWA National Bridge Inventory: 74.8% rated Good, 22.5% Fair, 2.6% Poor.

151
Public bridges: 74.8%
Good condition: 2.6%
Poor condition

The verdict

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

St. Lucie County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

36th
of 67 on Poor share: 2.6%
Poor-condition share: 151
public highway bridges: 1981
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. Lucie County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, St. Lucie County ranks #36 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.6%). St. Lucie County, Florida contains 151 public highway bridges. Roughly 74.8% are rated “Good,” 22.5% “Fair,” and 2.6% “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

151

Public highway bridges in St. Lucie County

Good condition

74.8%

113 of 151 rated 7-9

Fair condition

22.5%

34 of 151 rated 5-6

Poor condition

2.6%

4 of 151 rated 4 or below

In-state Poor-share rank

#36 of 67

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

Condition distribution

Share of 151 NBI-tracked bridges by lowest applicable component rating.

Good

74.8% (113)

Fair

22.5% (34)

Poor

2.6% (4)

St. Lucie County's Poor-condition bridges carry 16,700 vehicle crossings a day

That is 0.7% of the county's reported daily bridge traffic on 2.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,175 crossings a day against 15,870 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 151 of 151 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

37.7% of St. Lucie County's bridges have passed the 50-year mark

57 of the 151 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 74.8% 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 42.5% of the county's Poor-condition bridge traffic

SR-A1A over Intracoastal Waterway, built 1963, carries 7,100 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 4-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 16,700 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

1
1940s

1
1950s

24
1960s

26
1970s

14
1980s

35
1990s

14
2000s

24
2010s

8
2020s

3

What this shows Construction peaked in the 1980s, when 35 of the county's bridges still in the inventory were built, which is 23.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1981) matches the Florida average (1983).

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

The 5 Florida counties nearest St. Lucie County in number of bridges, with their condition splits. Its 2.6% Poor share is the 3rd-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1986 is 5 years older.

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

Bridge inventory size and condition shares for St. Lucie County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Leon County	165	35.8%	60%	4.2%	1981
Holmes County	156	30.8%	51.3%	17.9%	1987
Pasco County	151	81.5%	17.2%	1.3%	1994
St. Lucie County (this page)	151	74.8%	22.5%	2.6%	1981
Jackson County	146	21.2%	71.2%	7.5%	1982
St. Johns County	141	61%	37.6%	1.4%	1988

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

Similar inventory size

Nearest county inventories outside FL (151 bridges here).

Randolph County, AR · 151 bridges
Hall County, GA · 151 bridges
Richland County, IL · 151 bridges
Benton County, IN · 151 bridges

Similar average build year

Nearest mean year-built outside FL (1981 here).

Franklin County, OH · avg 1981 · 922 bridges
Greenville County, SC · avg 1981 · 635 bridges
Montgomery County, OH · avg 1981 · 632 bridges
McLean County, IL · avg 1981 · 624 bridges

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

All 151 Good 113 Fair 34 Poor 4

All bridges (151)

Sort:

St. Lucie County Bridge Snapshot

Condition distribution

St. Lucie County's Poor-condition bridges carry 16,700 vehicle crossings a day

37.7% of St. Lucie County's bridges have passed the 50-year mark

One structure carries 42.5% of the county's Poor-condition bridge traffic

How St. Lucie 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 (151)

SHINN RD (CR-609A)

53RD STREET

TAYLOR DAIRY ROAD

SR-A1A (N. Causwy)

KEEN RD (CR-611)

TAYLOR DAIRY ROAD

CR712A (MCCARTY RD

CR 712 150.3

US-1 (SR-5) NB

CARLTON RD (CR613)

ELEVEN MILE ROAD

SAVONA BLVD.

SR91 N/S TPK 139.7

CR-707(Citrus Ave)

SR91 SB TPK 158.6

St Lucie West Blvd

SB I-95 (SR-9)

CR611B(SELVITZ RD)

SB SR-9 ( I-95)

PAAR DR.

NB I-95 (SR-9)

SB I-95 (SR-9)

US-1 (SR-5)

EB St. Lucie Blvd.

SR70 WB Okeechobee

NB SR-9 (I-95)

SR91 SB TPK 142.2

SR91 NB TPK 142.2

INDIAN RIVER DRIVE

SRAIA (South Cswy)

WB Prt St Lucie Bd

RANGE LINERD CR609

NB I-95 (SR-9)

SR-A1A

KIRBY LOOP ROAD

PRIMA VISTA BLVD.

CR611B(EDWARDS RD)

SHINN ROAD

GLADES CUTOFF

Okeechobee Rd.

CR603(JOHNSTON RD)

NB I-95 (S.R. 9)

SB I-95 (S.R. 9)

SR-713 (Kings Hwy)

SR91 NB TPK 158.6

NB I-95 (SR-9)

SR-91 NB TPK 150.7

SR91 TPK SB 150.7

US-1 (SR-5) SB

EB SR 70

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