Total bridges
313
Public highway bridges in Linn County
County profile · official public datasets
Linn County, MO
313 public highway bridges tracked in the FHWA National Bridge Inventory: 39% rated Good, 43.5% Fair, 17.6% Poor.
- 313
- Public bridges
- 39%
- Good condition
- 17.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Linn County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 104th
- of 115 on Poor share
- 17.6%
- Poor-condition share
- 313
- public highway bridges
- 1980
- 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.
Linn County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Linn County ranks #104 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 17.6%). Linn County, Missouri contains 313 public highway bridges. Roughly 39% are rated “Good,” 43.5% “Fair,” and 17.6% “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
39%
122 of 313 rated 7-9
Fair condition
43.5%
136 of 313 rated 5-6
Poor condition
17.6%
55 of 313 rated 4 or below
In-state Poor-share rank
#104 of 115
Among Missouri counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 313 NBI-tracked bridges by lowest applicable component rating.
Good 39% (122)
Fair 43.5% (136)
Poor 17.6% (55)
Linn County's Poor-condition bridges carry 22,110 vehicle crossings a day
That is 8.7% of the county's reported daily bridge traffic on 17.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 402 crossings a day against 273 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 313 of 313 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
34.8% of Linn County's bridges have passed the 50-year mark
109 of the 313 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 39% 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 39.5% of the county's Poor-condition bridge traffic
US 36 E over SIGHTS BR, built 1924, carries 8,727 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 55-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 22,110 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Linn County's bridges were built
313 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 1
1910–1919
1 bridges
- 1920s 8
1920–1929
8 bridges
- 1930s 26
1930–1939
26 bridges
- 1940s 21
1940–1949
21 bridges
- 1950s 26
1950–1959
26 bridges
- 1960s 20
1960–1969
20 bridges
- 1970s 14
1970–1979
14 bridges
- 1980s 30
1980–1989
30 bridges
- 1990s
1990–1999
76 bridges
- 2000s
2000–2009
60 bridges
- 2010s 24
2010–2019
24 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1990s, when 76 of the county's bridges still in the inventory were built, which is 24.3% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1980) matches the Missouri average (1979).
How Linn County compares with Missouri's closest counties by inventory size
The 5 Missouri counties nearest Linn County in number of bridges, with their condition splits. Its 17.6% Poor share is the 6th-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1982 is in line with the group.
Showing the 5 closest of 114 Missouri counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Bates County | 319 | 22.6% | 70.2% | 7.2% | 1977 |
| Audrain County | 314 | 41.4% | 53.8% | 4.8% | 1987 |
| Linn County (this page) | 313 | 39% | 43.5% | 17.6% | 1980 |
| Callaway County | 303 | 39.3% | 54.5% | 6.3% | 1978 |
| Adair County | 301 | 60.8% | 32.6% | 6.6% | 1992 |
| Newton County | 300 | 39% | 54.3% | 6.7% | 1978 |
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 Linn 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 Linn County, both outside Missouri so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MO (313 bridges here).
- Natchitoches County, LA · 313 bridges
- Cedar County, NE · 313 bridges
- Jackson County, AL · 314 bridges
- Cloud County, KS · 314 bridges
Similar average build year
Nearest mean year-built outside MO (1980 here).
- Tulsa County, OK · avg 1980 · 1,135 bridges
- Miami-Dade County, FL · avg 1980 · 1,057 bridges
- Pulaski County, AR · avg 1980 · 721 bridges
- McLennan County, TX · avg 1980 · 714 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (136)
LAMA RD
FairOver: WINNEGAN CR
S 9 T 60 N R 18 W, Linn, MO
Built 1997 Load: 39.6 t ADT: 30
GOLD RD
FairOver: TURKEY CR
S 21 T 58 N R 20 W, Linn, MO
Built 1960 Load: 39.6 t ADT: 20
US 36 W
FairOver: W YELLOW CR
S 9 T 57 N R 19 W, Linn, MO
Built 1985 Load: 39.6 t ADT: 5,167
CLARK DR
FairOver: PARSONS CR
S 29 T 60 N R 21 W, Linn, MO
Built 1989 Load: 40.5 t ADT: 30
HUSK RD
FairOver: TURKEY CR
S 9 T 57 N R 20 W, Linn, MO
Built 1930 Load: 40.5 t ADT: 15
GALAXY RD
FairOver: LIT TURKEY CR
S 2 T 57 N R 20 W, Linn, MO
Built 1930 Load: 40.5 t ADT: 50
FARLEY RD
FairOver: LIT MUDDY CR
S 8 T 58 N R 20 W, Linn, MO
Built 2002 Load: 40.5 t ADT: 15
US 36 E
FairOver: LIT PARSONS CR
S 3 T 57 N R 22 W, Linn, MO
Built 1985 Load: 41.4 t ADT: 6,168
GARDEN RD
FairOver: MUDDY CR
S 29 T 59 N R 20 W, Linn, MO
Built 1996 Load: 42.3 t ADT: 30
US 36 E
FairOver: S BR OF MUDDY CR
S 12 T 57 N R 21 W, Linn, MO
Built 1961 Load: 42.3 t ADT: 12,753
US 36 E
FairOver: LIT TURKEY CR
S 3 T 57 N R 20 W, Linn, MO
Built 1961 Load: 43.2 t ADT: 12,579
KOPPLE RD
FairOver: E YELLOW CR
S 18 T 59 N R 18 W, Linn, MO
Built 1994 Load: 45.0 t ADT: 30
US 36 E
FairOver: BIG TURKEY CR OVRF
S 9 T 57 N R 20 W, Linn, MO
Built 1988 Load: 45.0 t ADT: 5,353
RT WW E
FairOver: LOCUST BR
S 28 T 57 N R 18 W, Linn, MO
Built 1979 Load: 47.7 t ADT: 794
US 36 W
FairOver: E YELLOW CR
S 12 T 57 N R 19 W, Linn, MO
Built 1985 Load: 47.7 t ADT: 4,631
US 36 E
FairOver: ELK CR
S 12 T 57 N R 20 W, Linn, MO
Built 1955 Load: 47.7 t ADT: 11,285
HUSK RD
FairOver: ELK CR
S 12 T 57 N R 20 W, Linn, MO
Built 1995 Load: 48.6 t ADT: 40
MIDWAY RD
FairOver: BR OF LONG BR
S 16 T 58 N R 18 W, Linn, MO
Built 1986 Load: 48.6 t ADT: 10
BALKEN RD
FairOver: BR OF PARSONS CR
S 12 T 58 N R 22 W, Linn, MO
Built 1990 Load: 49.5 t ADT: 30
LEMAY RD
FairOver: E YELLOW CR
S 7 T 58 N R 18 W, Linn, MO
Built 2005 Load: 50.4 t ADT: 20
LAMA RD
FairOver: BR OF W YELLOW CR
S 12 T 60 N R 19 W, Linn, MO
Built 1997 Load: 51.3 t ADT: 5
US 36 W
FairOver: VAN DORSEN CR
S 11 T 57 N R 18 W, Linn, MO
Built 1977 Load: 52.2 t ADT: 3,232
MEADE RD
FairOver: BR OF HAMILTON BR
S 24 T 59 N R 18 W, Linn, MO
Built 1986 Load: 53.1 t ADT: 30
US 36 E
FairOver: HICKORY CR
S 9 T 57 N R 21 W, Linn, MO
Built 1984 Load: 54.0 t ADT: 5,636
US 36 E
FairOver: E YELLOW CR
S 11 T 57 N R 19 W, Linn, MO
Built 1955 Load: 55.8 t ADT: 9,334
GLADE RD
FairOver: TURKEY CR
S 28 T 58 N R 20 W, Linn, MO
Built 1987 Load: 58.5 t ADT: 25
OR 36 E
FairOver: E YELLOW CR
S 11 T 57 N R 19 W, Linn, MO
Built 1924 Load: 61.2 t ADT: 25
BASKER RD
FairOver: LEWIS CR
S 30 T 58 N R 21 W, Linn, MO
Built 1997 Load: 62.1 t ADT: 25
BU 36 E
FairOver: ELK CR
S 1 T 57 N R 20 W, Linn, MO
Built 1926 Load: 62.1 t ADT: 3,841
ATLAS RD
FairOver: COON CR
S 3 T 58 N R 22 W, Linn, MO
Built 2004 Load: 64.8 t ADT: 5
US 36 E
FairOver: VAN DORSEN CR
S 11 T 57 N R 18 W, Linn, MO
Built 1924 Load: 64.8 t ADT: 9,229
LILY RD
FairOver: BR OF E YELLOW CR
S 18 T 57 N R 18 W, Linn, MO
Built 2006 Load: 71.1 t ADT: 20
ABBEY DR
FairOver: BRANCH
S 10 T 59 N R 22 W, Linn, MO
Built 1988 Load: 73.8 t ADT: 10
US 36 W
FairOver: HICKORY CR
S 4 T 57 N R 21 W, Linn, MO
Built 1967 Load: 79.2 t ADT: 6,034
FALCON DR
FairOver: UNKNOWN STR
S 18 T 58 N R 20 W, Linn, MO
Built 1995 Load: 86.4 t ADT: 30
AUSTIN RD
FairOver: MUDDY CR
S 22 T 60 N R 22 W, Linn, MO
Built 2010 Load: 99.9 t ADT: 35
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.