Total bridges
104
Public highway bridges in Nassau County
County profile · official public datasets
Nassau County, FL
104 public highway bridges tracked in the FHWA National Bridge Inventory: 49% rated Good, 48.1% Fair, 2.9% Poor.
- 104
- Public bridges
- 49%
- Good condition
- 2.9%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Nassau County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 40th
- of 67 on Poor share
- 2.9%
- Poor-condition share
- 104
- public highway bridges
- 1977
- 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.
Nassau County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Nassau County ranks #40 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.9%). Nassau County, Florida contains 104 public highway bridges. Roughly 49% are rated “Good,” 48.1% “Fair,” and 2.9% “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.
Good condition
49%
51 of 104 rated 7-9
Fair condition
48.1%
50 of 104 rated 5-6
Poor condition
2.9%
3 of 104 rated 4 or below
In-state Poor-share rank
#40 of 67
Among Florida counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 104 NBI-tracked bridges by lowest applicable component rating.
Good 49% (51)
Fair 48.1% (50)
Poor 2.9% (3)
Nassau County's Poor-condition bridges carry 2,561 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 2.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 854 crossings a day against 9,645 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 104 of 104 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
51.9% of Nassau County's bridges have passed the 50-year mark
54 of the 104 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 49% 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 93.7% of the county's Poor-condition bridge traffic
CR 121 over DEEP CREEK, built 1949, carries 2,400 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 3-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 2,561 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Nassau County's bridges were built
104 bridges with a recorded construction year, grouped by decade
- 1920s 4
1920–1929
4 bridges
- 1930s 7
1930–1939
7 bridges
- 1940s
1940–1949
8 bridges
- 1950s
1950–1959
16 bridges
- 1960s
1960–1969
14 bridges
- 1970s
1970–1979
9 bridges
- 1980s 2
1980–1989
2 bridges
- 1990s
1990–1999
11 bridges
- 2000s
2000–2009
12 bridges
- 2010s
2010–2019
19 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 2010s, when 19 of the county's bridges still in the inventory were built, which is 18.3% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1977, 6 years older than the Florida average of 1983.
How Nassau County compares with Florida's closest counties by inventory size
The 5 Florida counties nearest Nassau County in number of bridges, with their condition splits. Its 2.9% Poor share is the 4th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1981 is in line with the group.
Showing the 5 closest of 66 Florida counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Columbia County | 112 | 50.9% | 48.2% | 0.9% | 1970 |
| Sumter County | 112 | 68.8% | 31.3% | 0% | 1991 |
| Flagler County | 105 | 57.1% | 41% | 1.9% | 1981 |
| Nassau County (this page) | 104 | 49% | 48.1% | 2.9% | 1977 |
| Monroe County | 100 | 34% | 59% | 7% | 1978 |
| Washington County | 99 | 43.4% | 46.5% | 10.1% | 1984 |
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 Nassau 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 Nassau County, both outside Florida so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside FL (104 bridges here).
- Brooks County, GA · 104 bridges
- Grady County, GA · 104 bridges
- Bonner County, ID · 104 bridges
- Martin County, IN · 104 bridges
Similar average build year
Nearest mean year-built outside FL (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (104)
US-301 (SR-200)
GoodOver: FUNKS CREEK BRANCH SOUTH
9.8 MI. N. OF US-90, Nassau, FL
Built 2015 Load: 75.1 t ADT: 8,300
STOKES ROAD
PoorOver: ST. MARYS RIVER
0.7 MI WEST OF CR 121, Nassau, FL
Built 1978 Load: 21.9 t ADT: 110
CR 121
PoorOver: DEEP CREEK
0.9 MI NORTH OF CR 108, Nassau, FL
Built 1949 Load: 23.5 t ADT: 2,400
CRANDALL ROAD
PoorOver: MCQUEEN SWAMP
0.2 MI NORTHEAST OF US 17, Nassau, FL
Built 1973 Load: 23.5 t ADT: 51
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.