County profile · official public datasets

Seminole County, FL

177 public highway bridges tracked in the FHWA National Bridge Inventory: 82.5% rated Good, 16.9% Fair, 0.6% Poor.

177
Public bridges: 82.5%
Good condition: 0.6%
Poor condition

The verdict

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

Seminole County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 22%
lowest Poor share in state: 0.6%
Poor-condition share: 177
public highway bridges: 2000
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.

Seminole County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Seminole County ranks #15 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.6%). Seminole County, Florida contains 177 public highway bridges. Roughly 82.5% are rated “Good,” 16.9% “Fair,” and 0.6% “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

177

Public highway bridges in Seminole County

Good condition

82.5%

146 of 177 rated 7-9

Fair condition

16.9%

30 of 177 rated 5-6

Poor condition

0.6%

1 of 177 rated 4 or below

In-state Poor-share rank

#15 of 67

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

Condition distribution

Share of 177 NBI-tracked bridges by lowest applicable component rating.

Good

82.5% (146)

Fair

16.9% (30)

Poor

0.6% (1)

Seminole County's Poor-condition bridges carry 2,789 vehicle crossings a day

That is 0.1% of the county's reported daily bridge traffic on 0.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,789 crossings a day against 21,679 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 177 of 177 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

9.6% of Seminole County's bridges have passed the 50-year mark

17 of the 177 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 82.5% 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

Murphy Road over Gee Creek, built 1973, carries 2,789 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 2,789 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

1
1950s

1
1960s

4
1970s

14
1980s

13
1990s

55
2000s

33
2010s

21
2020s

34

What this shows Construction peaked in the 1990s, when 55 of the county's bridges still in the inventory were built, which is 31.1% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 2000, 17 years newer than the Florida average of 1983.

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

The 5 Florida counties nearest Seminole County in number of bridges, with their condition splits. Its 0.6% Poor share is the 1st-lowest of these 6. Its average build year of 2000 against a peer-group mean of 1986 is 14 years newer.

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

Bridge inventory size and condition shares for Seminole County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Santa Rosa County	192	29.2%	65.6%	5.2%	1986
Seminole County (this page)	177	82.5%	16.9%	0.6%	2000
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	151	74.8%	22.5%	2.6%	1981

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

Similar inventory size

Nearest county inventories outside FL (177 bridges here).

Hale County, AL · 177 bridges
Macon County, AL · 177 bridges
Washington County, AL · 177 bridges
Dodge County, MN · 177 bridges

Similar average build year

Nearest mean year-built outside FL (2000 here).

Broomfield County, CO · avg 2000 · 66 bridges
Dare County, NC · avg 2000 · 40 bridges
Aleutians East County, AK · avg 2000 · 16 bridges
Collin County, TX · avg 1998 · 1,127 bridges

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

All 177 Good 146 Fair 30 Poor 1

All bridges (177)

Sort:

Seminole County Bridge Snapshot

Condition distribution

Seminole County's Poor-condition bridges carry 2,789 vehicle crossings a day

9.6% of Seminole County's bridges have passed the 50-year mark

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

How Seminole 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 (177)

SR-429 SB

Orange Boulevard

Ramp M3

SR 417 SB 41.8

SR 417 SB 40.7

SR 417 NB 40.8

SR 417 NB 49.2

SR 417 NB 49.9

CR-419 SB

Ramp L1

I-4 EB

I-4 EB Ramp M1

CR-427

SR-436 EB

SR 417 SB 55.0

SR-436 WB

CR 46A EB

I-4 EBCD Ramp M3

Wymore Road

CR-46A

SR-436 EB Ramp

Ramp N2

SR 417 NB 55.0

SR 417 NB 43.7

I-4 EB Ramp

SR-414

I-4 WB Ramp N2

SR 429 NB Ramp L2

SR 417 SB 53.7

SR 417 NB 53.7

Kewannee Trail

Ramp L2

EE Williamson Road

SR 417 SB 49.9

I-4 WB

SR 417 NB 52.1

I-4 EB

SR-414

Ramp D1

SR 417 SB 50.5

SR-429 SB

SR-429 EB

SR-429 SB

SR-429 NB

SR-429 SB

SR-429 EB

SR 417 SB 38.5

Dyson Drive

Lake Howell Road

I-4

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