County profile · official public datasets

Collier County, FL

370 public highway bridges tracked in the FHWA National Bridge Inventory: 73.2% rated Good, 24.9% Fair, 1.9% Poor.

370
Public bridges: 73.2%
Good condition: 1.9%
Poor condition

The verdict

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

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

Top 45%
lowest Poor share in state: 1.9%
Poor-condition share: 370
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.

Collier County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Collier County ranks #30 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.9%). Collier County, Florida contains 370 public highway bridges. Roughly 73.2% are rated “Good,” 24.9% “Fair,” and 1.9% “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

370

Public highway bridges in Collier County

Good condition

73.2%

271 of 370 rated 7-9

Fair condition

24.9%

92 of 370 rated 5-6

Poor condition

1.9%

7 of 370 rated 4 or below

In-state Poor-share rank

#30 of 67

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

Condition distribution

Share of 370 NBI-tracked bridges by lowest applicable component rating.

Good

73.2% (271)

Fair

24.9% (92)

Poor

1.9% (7)

Collier County's Poor-condition bridges carry 7,070 vehicle crossings a day

That is 0.2% of the county's reported daily bridge traffic on 1.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,010 crossings a day against 13,371 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 370 of 370 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

42.2% of Collier County's bridges have passed the 50-year mark

156 of the 370 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 73.2% 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 45.3% of the county's Poor-condition bridge traffic

CR 846 over DRAINAGE CNL, built 1948, carries 3,200 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 7-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 7,070 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1940s

28
1950s

55
1960s

60
1970s

23
1980s

40
1990s

86
2000s

35
2010s

30
2020s

13

What this shows Construction peaked in the 1990s, when 86 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 25 to 34 years old in the 2024 inventory. Its average build year (1981) matches the Florida average (1983).

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

The 5 Florida counties nearest Collier County in number of bridges, with their condition splits. Its 1.9% Poor share is the 6th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1982 is in line with the group.

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

Bridge inventory size and condition shares for Collier County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Pinellas County	435	63.7%	34.5%	1.8%	1983
Lee County	391	75.4%	23.8%	0.8%	1982
Collier County (this page)	370	73.2%	24.9%	1.9%	1981
Polk County	360	55.3%	44.7%	0%	1979
Sarasota County	298	57.7%	41.6%	0.7%	1982
Osceola County	255	62.4%	37.6%	0%	1985

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

Similar inventory size

Nearest county inventories outside FL (370 bridges here).

Brazos County, TX · 370 bridges
Lee County, IL · 371 bridges
Genesee County, MI · 371 bridges
Carroll County, MO · 371 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 370 Good 271 Fair 92 Poor 7

All bridges (370)

Sort:

Collier County Bridge Snapshot

Condition distribution

Collier County's Poor-condition bridges carry 7,070 vehicle crossings a day

42.2% of Collier County's bridges have passed the 50-year mark

One structure carries 45.3% of the county's Poor-condition bridge traffic

How Collier 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 (370)

20TH PLACE SW

CR-837

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-45)

US-41 (SR-90)

US-41

CR951/COLLIER BLVD

US-41 (SR-45)

CR839 TURNER RIVRD

US-41 (SR-45)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41(SR-45/SR-90)

US-41

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

CR839 TURNER RIVRD

US-41 (SR-90)

CR 858

CR 858

CR-858

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

US-41 (SR-90)

18TH AVENUE SW

LOOP ROAD

LOOP ROAD

I-75 NB

I-75 SB (SR-93)

STEWART BLVD.

CR-858

PROPERTY ACCESS RO

PROPERTY ACCESS RO

I-75 NB

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