County profile · official public datasets

Robertson County, TN

204 public highway bridges tracked in the FHWA National Bridge Inventory: 63.7% rated Good, 34.8% Fair, 1.5% Poor.

204
Public bridges: 63.7%
Good condition: 1.5%
Poor condition

The verdict

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

Robertson County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 13%
lowest Poor share in state: 1.5%
Poor-condition share: 204
public highway bridges: 1975
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.

Robertson County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Robertson County ranks #12 of 95 Tennessee counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.5%). Robertson County, Tennessee contains 204 public highway bridges. Roughly 63.7% are rated “Good,” 34.8% “Fair,” and 1.5% “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

204

Public highway bridges in Robertson County

Good condition

63.7%

130 of 204 rated 7-9

Fair condition

34.8%

71 of 204 rated 5-6

Poor condition

1.5%

3 of 204 rated 4 or below

In-state Poor-share rank

#12 of 95

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

Condition distribution

Share of 204 NBI-tracked bridges by lowest applicable component rating.

Good

63.7% (130)

Fair

34.8% (71)

Poor

1.5% (3)

Robertson County's Poor-condition bridges carry 2,246 vehicle crossings a day

That is 0.1% of the county's reported daily bridge traffic on 1.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 749 crossings a day against 12,258 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 204 of 204 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

53.9% of Robertson County's bridges have passed the 50-year mark

110 of the 204 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 63.7% 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 44.4% of the county's Poor-condition bridge traffic

FAP 76 over SULPHUR FORK CREEK, built 1957, carries 998 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 2,246 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1920s

1
1930s

5
1940s

7
1950s

16
1960s

49
1970s

61
1980s

23
1990s

15
2000s

14
2010s

3
2020s

9

What this shows Construction peaked in the 1970s, when 61 of the county's bridges still in the inventory were built, which is 29.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1975) matches the Tennessee average (1977).

How Robertson County compares with Tennessee's closest counties by inventory size

The 5 Tennessee counties nearest Robertson County in number of bridges, with their condition splits. Its 1.5% Poor share is the 1st-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1979 is in line with the group.

Showing the 5 closest of 94 Tennessee counties eligible for comparison.

Bridge inventory size and condition shares for Robertson County and the 5 Tennessee counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Lawrence County	211	53.6%	44.5%	1.9%	1979
Henderson County	207	31.9%	64.7%	3.4%	1983
Robertson County (this page)	204	63.7%	34.8%	1.5%	1975
Smith County	202	56.4%	33.7%	9.9%	1971
Tipton County	201	40.3%	55.2%	4.5%	1985
Bradley County	199	58.8%	38.7%	2.5%	1975

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

Similar inventory size

Nearest county inventories outside TN (204 bridges here).

Greene County, AL · 204 bridges
Flathead County, MT · 204 bridges
Pembina County, ND · 204 bridges
Okfuskee County, OK · 204 bridges

Similar average build year

Nearest mean year-built outside TN (1975 here).

San Bernardino County, CA · avg 1975 · 1,422 bridges
Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges

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

All 204 Good 130 Fair 71 Poor 3

Fair-condition bridges (71)

Sort:

Robertson County Bridge Snapshot

Condition distribution

Robertson County's Poor-condition bridges carry 2,246 vehicle crossings a day

53.9% of Robertson County's bridges have passed the 50-year mark

One structure carries 44.4% of the county's Poor-condition bridge traffic

How Robertson County compares with Tennessee's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (71)

NFA A438

NFA A442

NFA A473

NFA A482 348129S

NFA 1014 (SA 7419)

I65

NFA 1953 (SA 7417)

I65

I65

I65

NFA B003 (SA 7406)

NFA 1021 (SA 7416)

NFA 1021 (SA 7416)

NFA 1019 (SA 7421)

FAP 11

FAP 11

FAS 52

FAS 257

NFA A197

FAS 256

FAP 11

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