Total bridges
117
Public highway bridges in Loudon County
County profile · official public datasets
Loudon County, TN
117 public highway bridges tracked in the FHWA National Bridge Inventory: 53% rated Good, 45.3% Fair, 1.7% Poor.
- 117
- Public bridges
- 53%
- Good condition
- 1.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Loudon County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 16%
- lowest Poor share in state
- 1.7%
- Poor-condition share
- 117
- public highway bridges
- 1971
- 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.
Loudon County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Loudon County ranks #15 of 95 Tennessee counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.7%). Loudon County, Tennessee contains 117 public highway bridges. Roughly 53% are rated “Good,” 45.3% “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.
Good condition
53%
62 of 117 rated 7-9
Fair condition
45.3%
53 of 117 rated 5-6
Poor condition
1.7%
2 of 117 rated 4 or below
In-state Poor-share rank
#15 of 95
Among Tennessee counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 117 NBI-tracked bridges by lowest applicable component rating.
Good 53% (62)
Fair 45.3% (53)
Poor 1.7% (2)
Loudon County's Poor-condition bridges carry 450 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 225 crossings a day against 15,157 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 117 of 117 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
65% of Loudon County's bridges have passed the 50-year mark
76 of the 117 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 53% 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 51.1% of the county's Poor-condition bridge traffic
NFA A661 over POLECAT CREEK, built 1944, carries 230 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 450 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Loudon County's bridges were built
117 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 4
1920–1929
4 bridges
- 1930s 4
1930–1939
4 bridges
- 1940s 5
1940–1949
5 bridges
- 1950s 14
1950–1959
14 bridges
- 1960s
1960–1969
19 bridges
- 1970s
1970–1979
37 bridges
- 1980s
1980–1989
15 bridges
- 1990s 5
1990–1999
5 bridges
- 2000s 6
2000–2009
6 bridges
- 2010s 7
2010–2019
7 bridges
What this shows Construction peaked in the 1970s, when 37 of the county's bridges still in the inventory were built, which is 31.6% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1971, 6 years older than the Tennessee average of 1977.
How Loudon County compares with Tennessee's closest counties by inventory size
The 5 Tennessee counties nearest Loudon County in number of bridges, with their condition splits. Its 1.7% Poor share is the 1st-lowest of these 6. Its average build year of 1971 against a peer-group mean of 1975 is in line with the group.
Showing the 5 closest of 94 Tennessee counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Jefferson County | 122 | 13.9% | 74.6% | 11.5% | 1966 |
| Morgan County | 120 | 48.3% | 45% | 6.7% | 1981 |
| Hamblen County | 119 | 17.6% | 79.8% | 2.5% | 1976 |
| Houston County | 118 | 45.8% | 50.8% | 3.4% | 1978 |
| Loudon County (this page) | 117 | 53% | 45.3% | 1.7% | 1971 |
| Scott County | 111 | 24.3% | 71.2% | 4.5% | 1973 |
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 Loudon 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 Loudon County, both outside Tennessee so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside TN (117 bridges here).
- Franklin County, GA · 117 bridges
- Polk County, GA · 117 bridges
- Clark County, KY · 117 bridges
- Fleming County, KY · 117 bridges
Similar average build year
Nearest mean year-built outside TN (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Baltimore County, MD · avg 1971 · 783 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Linn County, OR · avg 1971 · 566 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (117)
FAS 1
GoodOver: TOWN CREEK
1.5 M NE OF KNOX CO LN, Loudon, TN
Built 1926 Load: 32.4 t ADT: 8,417
FAP 72
GoodOver: CLEAR PRONG CREEK
3.5 MI N. OF MONROE CO., Loudon, TN
Built 1981 Load: 32.4 t ADT: 5,344
FAP 72
GoodOver: DRY VALLEY CREEK
WEST OF LOUDON CITY, Loudon, TN
Built 1974 Load: 32.4 t ADT: 12,168
FAP 73
GoodOver: TOWN CREEK
1.3 M S OF LENOIR CITY, Loudon, TN
Built 1967 Load: 32.4 t ADT: 24,559
FAP 73
GoodOver: CLOYD CREEK
0.3 MI. W OF BLOUNT CO., Loudon, TN
Built 1965 Load: 32.4 t ADT: 12,626
FAP 73
GoodOver: GRUBB CREEK
.6 M SW OF MANIS RD, Loudon, TN
Built 1984 Load: 32.4 t ADT: 9,275
FAP 73
GoodOver: GRUBB CREEK
.3 M SW OF MANIS RD, Loudon, TN
Built 1983 Load: 32.4 t ADT: 9,275
FAP 73
GoodOver: TRIB OF CLOYD CREEK
.3 M SW OF MANIS RD, Loudon, TN
Built 2004 Load: 32.4 t ADT: 12,626
SR 73
GoodOver: TENNESSEE RIVER
4.8 MI SOUTH OF I-75, Loudon, TN
Built 2017 Load: 32.4 t ADT: 13,140
FAP 73 731481N
GoodOver: SOUTHERN RAILWAY
1 M W OF LENOIR CITY, Loudon, TN
Built 2014 Load: 32.4 t ADT: 13,140
FAS 322
GoodOver: GREASEY CREEK
1.2 M SE OF I75, Loudon, TN
Built 1955 Load: 32.4 t ADT: 1,603
I75
GoodOver: NFA 1247 KINGSTON ST
1.4 M SE OF LENIOR CITY, Loudon, TN
Built 1972 Load: 33.4 t ADT: 55,134
I40 RL
GoodOver: PAW PAW PLAINS RD.
.1 M W OF ROANE CO LN, Loudon, TN
Built 1960 Load: 47.6 t ADT: 42,725
I40 LL
GoodOver: PAW PAW PLAINS RD.
.1 M W OF ROANE CO LN, Loudon, TN
Built 1960 Load: 47.6 t ADT: 42,725
NFA 1269
GoodOver: SINKING CREEK
3.5 M. NW. GREENBACK., Loudon, TN
Built 1977 Load: 51.5 t ADT: 997
NFA A661
PoorOver: POLECAT CREEK
6.25 M. W. LOUDON., Loudon, TN
Built 1944 Load: 16.5 t ADT: 230
NFA A808
PoorOver: BACON CREEK
IN CITY OF PHILADELPHIA, Loudon, TN
Built 1930 Load: 24.3 t ADT: 220
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.