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)
INDIGO RD
FairOver: BEAR BR
S 20 T 59 N R 19 W, Linn, MO
Built 1930 Load: 4.5 t ADT: 5
BARON RD
FairOver: LEWIS CR
S 18 T 58 N R 21 W, Linn, MO
Built 1935 Load: 4.5 t ADT: 5
ARMOR RD
FairOver: SMOKEY BR
S 35 T 59 N R 22 W, Linn, MO
Built 1955 Load: 8.1 t ADT: 10
KENDA DR
FairOver: BR OF W YELLOW CR
S 14 T 60 N R 19 W, Linn, MO
Built 1950 Load: 9.0 t ADT: 5
HILL RD
FairOver: TURKEY CR
S 28 T 59 N R 20 W, Linn, MO
Built 1930 Load: 9.0 t ADT: 20
BRINK DR
FairOver: BR OF PARSONS CR
S 23 T 58 N R 22 W, Linn, MO
Built 1978 Load: 9.0 t ADT: 10
HUSK RD
FairOver: LIT TURKEY CR
S 15 T 57 N R 20 W, Linn, MO
Built 1940 Load: 9.0 t ADT: 25
RT WW E
FairOver: MUSSEL FK
S 25 T 57 N R 18 W, Linn, MO
Built 1957 Load: 9.0 t ADT: 212
GLOBE RD
FairOver: TURKEY CR
S 16 T 59 N R 20 W, Linn, MO
Built 1930 Load: 9.9 t ADT: 15
COUNTY RD
FairOver: SAM BR
S 21 T 60 N R 18 W, Linn, MO
Built 1940 Load: 10.8 t ADT: 5
RT U S
FairOver: SIGHTS BR
S 5 T 57 N R 18 W, Linn, MO
Built 1955 Load: 10.8 t ADT: 298
FALK RD
FairOver: LOWES BR
S 5 T 59 N R 20 W, Linn, MO
Built 1940 Load: 12.6 t ADT: 15
IBERT RD
FairOver: UNNAMED STR
S 18 T 58 N R 19 W, Linn, MO
Built 1940 Load: 12.6 t ADT: 5
ARCTIC RD
FairOver: COON CR
S 22 T 59 N R 22 W, Linn, MO
Built 1950 Load: 12.6 t ADT: 5
ARROW RD
FairOver: BR OF PARSONS CR
S 36 T 57 N R 22 W, Linn, MO
Built 1997 Load: 12.6 t ADT: 35
BERRY DR
FairOver: BR OF LEWIS CR
S 36 T 58 N R 22 W, Linn, MO
Built 1940 Load: 13.5 t ADT: 15
LOCK DR
FairOver: TRIB TO E YELLOW C
S 29 T 59 N R 18 W, Linn, MO
Built 1960 Load: 13.5 t ADT: 5
IRON RD
FairOver: BEAR BR
S 29 T 60 N R 19 W, Linn, MO
Built 1992 Load: 15.3 t ADT: 10
GALAXY RD
FairOver: TURKEY CR
S 4 T 57 N R 20 W, Linn, MO
Built 1940 Load: 16.2 t ADT: 80
BROOK RD
FairOver: LICK BR
S 10 T 59 N R 21 W, Linn, MO
Built 1994 Load: 18.0 t ADT: 30
ITASKA RD
FairOver: BEAR CR
S 28 T 60 N R 19 W, Linn, MO
Built 1992 Load: 18.0 t ADT: 20
MEADE RD
FairOver: HAMILTON BR
S 16 T 59 N R 18 W, Linn, MO
Built 1990 Load: 18.0 t ADT: 30
DILL RD
FairOver: BR OF LINN CR
S 34 T 60 N R 21 W, Linn, MO
Built 1940 Load: 18.9 t ADT: 30
ALOE RD
FairOver: COON CR
S 11 T 58 N R 22 W, Linn, MO
Built 1945 Load: 18.9 t ADT: 15
IVA RD
FairOver: LONG BR
S 30 T 58 N R 19 W, Linn, MO
Built 1990 Load: 18.9 t ADT: 30
MAPLE DR
FairOver: BR OF SIGHTS BR
S 35 T 58 N R 18 W, Linn, MO
Built 1990 Load: 18.9 t ADT: 20
ANDES RD
FairOver: LIT MUDDY CR
S 26 T 60 N R 22 W, Linn, MO
Built 1996 Load: 19.8 t ADT: 15
ARROW RD
FairOver: BR OF PARSONS CR
S 36 T 57 N R 22 W, Linn, MO
Built 1990 Load: 19.8 t ADT: 35
JARGON DR
FairOver: UNNAMED BR
S 22 T 58 N R 19 W, Linn, MO
Built 1996 Load: 19.8 t ADT: 5
JODINE RD
FairOver: BRANCH
S 22 T 60 N R 19 W, Linn, MO
Built 2003 Load: 19.8 t ADT: 5
ATOM DR
FairOver: BR OF MUDDY CR
S 14 T 60 N R 22 W, Linn, MO
Built 1945 Load: 20.7 t ADT: 25
KADDON RD
FairOver: E YELLOW CR
S 30 T 60 N R 18 W, Linn, MO
Built 1905 Load: 20.7 t ADT: 20
MO 5 S
FairOver: BR OF LOCUST CR
S 30 T 60 N R 20 W, Linn, MO
Built 1929 Load: 20.7 t ADT: 751
GROVER RD
FairOver: LIT TURKEY CR
S 2 T 57 N R 20 W, Linn, MO
Built 1999 Load: 21.6 t ADT: 25
JARBOE RD
FairOver: BR OF W YELLOW CR
S 3 T 57 N R 19 W, Linn, MO
Built 1950 Load: 21.6 t ADT: 40
US 36 E
FairOver: W YELLOW CR
S 9 T 57 N R 19 W, Linn, MO
Built 1955 Load: 21.6 t ADT: 5,884
US 36 E
FairOver: MUSSEL FK
S 7 T 57 N R 17 W, Linn, MO
Built 1951 Load: 21.6 t ADT: 9,229
MO 5 S
FairOver: BR OF LOCUST CR
S 19 T 60 N R 20 W, Linn, MO
Built 1929 Load: 21.6 t ADT: 751
MO 139 S
FairOver: BR LIT MUDDY CR
S 13 T 60 N R 22 W, Linn, MO
Built 1936 Load: 21.6 t ADT: 263
MO 11 S
FairOver: LONG BR OVRFL
S 5 T 57 N R 19 W, Linn, MO
Built 1968 Load: 22.5 t ADT: 969
EKMAN DR
FairOver: COUCH BR
S 36 T 59 N R 21 W, Linn, MO
Built 1930 Load: 22.5 t ADT: 35
ECHO DR
FairOver: KEMPER BR
S 26 T 59 N R 21 W, Linn, MO
Built 1996 Load: 22.5 t ADT: 20
CASTLE RD
FairOver: UNNAMED STR
S 16 T 58 N R 21 W, Linn, MO
Built 1978 Load: 22.5 t ADT: 30
ARCADE RD
FairOver: LIT PARSONS BR
S 27 T 58 N R 22 W, Linn, MO
Built 1986 Load: 22.5 t ADT: 15
US 36 E
FairOver: E YELLOW CR
S 12 T 57 N R 19 W, Linn, MO
Built 1955 Load: 22.5 t ADT: 4,703
US 36 W
FairOver: BIG PARSONS CR
S 1 T 57 N R 22 W, Linn, MO
Built 1967 Load: 22.5 t ADT: 6,210
FOX DR
FairOver: BRANCH
S 5 T 59 N R 20 W, Linn, MO
Built 1988 Load: 23.4 t ADT: 20
GLADE RD
FairOver: LIT TURKEY CR
S 27 T 58 N R 20 W, Linn, MO
Built 2000 Load: 23.4 t ADT: 5
LAMA RD
FairOver: E YELLOW CR
S 7 T 60 N R 18 W, Linn, MO
Built 1991 Load: 23.4 t ADT: 35
MO 11 S
FairOver: E YELLOW CR
S 6 T 59 N R 18 W, Linn, MO
Built 1979 Load: 23.4 t ADT: 320
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.