Total bridges
177
Public highway bridges in Seminole County
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.
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.
When Seminole County's bridges were built
177 bridges with a recorded construction year, grouped by decade
- 1920s 1
1920–1929
1 bridges
- 1930s 1
1930–1939
1 bridges
- 1950s 1
1950–1959
1 bridges
- 1960s 4
1960–1969
4 bridges
- 1970s 14
1970–1979
14 bridges
- 1980s 13
1980–1989
13 bridges
- 1990s
1990–1999
55 bridges
- 2000s
2000–2009
33 bridges
- 2010s 21
2010–2019
21 bridges
- 2020s
2020–2029
34 bridges
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.
| 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.
Poor-condition bridges (1)
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.