County profile · official public datasets

Hamilton County, FL

60 public highway bridges tracked in the FHWA National Bridge Inventory: 35% rated Good, 63.3% Fair, 1.7% Poor.

60
Public bridges: 35%
Good condition: 1.7%
Poor condition

The verdict

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

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

Top 40%
lowest Poor share in state: 1.7%
Poor-condition share: 60
public highway bridges: 1968
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.

Hamilton County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hamilton County ranks #27 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.7%). Hamilton County, Florida contains 60 public highway bridges. Roughly 35% are rated “Good,” 63.3% “Fair,” and 1.7% “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

Public highway bridges in Hamilton County

Good condition

35%

21 of 60 rated 7-9

Fair condition

63.3%

38 of 60 rated 5-6

Poor condition

1.7%

1 of 60 rated 4 or below

In-state Poor-share rank

#27 of 67

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

Condition distribution

Share of 60 NBI-tracked bridges by lowest applicable component rating.

Good

35% (21)

Fair

63.3% (38)

Poor

1.7% (1)

Hamilton County's Poor-condition bridges carry 101 vehicle crossings a day

That is 0% of the county's reported daily bridge traffic on 1.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 101 crossings a day against 7,630 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 60 of 60 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

75% of Hamilton County's bridges have passed the 50-year mark

45 of the 60 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 35% 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 100% of the county's Poor-condition bridge traffic

SE 78TH PLACE over SWIFT CREEK, built 1988, carries 101 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 1-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 101 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

3
1940s

1
1950s

8
1960s

30
1970s

5
1980s

6
1990s

4
2000s

1
2010s

2

What this shows Construction peaked in the 1960s, when 30 of the county's bridges still in the inventory were built, which is 50% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1968, 15 years older than the Florida average of 1983.

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

The 5 Florida counties nearest Hamilton County in number of bridges, with their condition splits. Its 1.7% Poor share is the 4th-lowest of these 6. Its average build year of 1968 against a peer-group mean of 1974 is 6 years older.

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

Bridge inventory size and condition shares for Hamilton County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Highlands County	63	47.6%	50.8%	1.6%	1972
Gulf County	62	19.4%	67.7%	12.9%	1973
Hernando County	60	83.3%	16.7%	0%	1985
Madison County	60	41.7%	55%	3.3%	1968
Hamilton County (this page)	60	35%	63.3%	1.7%	1968
Glades County	59	40.7%	59.3%	0%	1971

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

Similar inventory size

Nearest county inventories outside FL (60 bridges here).

Heard County, GA · 60 bridges
Jenkins County, GA · 60 bridges
Oconee County, GA · 60 bridges
Woodford County, KY · 60 bridges

Similar average build year

Nearest mean year-built outside FL (1968 here).

Montgomery County, PA · avg 1968 · 828 bridges
San Joaquin County, CA · avg 1968 · 644 bridges
Providence County, RI · avg 1968 · 476 bridges
Imperial County, CA · avg 1968 · 444 bridges

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

All 60 Good 21 Fair 38 Poor 1

All bridges (60)

Sort:

Hamilton County Bridge Snapshot

Condition distribution

Hamilton County's Poor-condition bridges carry 101 vehicle crossings a day

75% of Hamilton County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

How Hamilton 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 (60)

SE 95TH STREET

SE 142ND BLVD

NW 25TH DRIVE

SE 182ND BLVD

CR 141

CR 148

NE 180TH BLVD

NW 86TH BLVD.

SR-6

CR-141

CR 249

US-129 (SR-51)

CR 150

US-41(SR-25 & 100)

CR 135

I-75 NB SR-93

SR-6

CR-132

US-41(SR-25 & 100)

CR 249

I-75 SB (SR-93)

CR 152

I-75 SB SR-93

US-129 (SR-100)

US-129 (SR-100)

CR 141

US-41 (SR-6 & 25)

I-75 (SR-93)

I-75 (SR-93)

CR 150

CR 150

CR-152

US-41 (SR-25 &100)

CR 132

CR 135

CR 141

CR 6

US-41(SR-25 & 100)

CR 51

CR 25A

CR 135

BELLVILLE RD

SR-143

CR 25A

I-75 NB (SR-93)

I-75 SB (SR-93)

I-75 NB (SR-93)

CR-249

CR-25A (KING HILL)

US-129 (SR-100)

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