Total bridges
171
Public highway bridges in Lewis County
County profile · official public datasets
Lewis County, MO
171 public highway bridges tracked in the FHWA National Bridge Inventory: 28.7% rated Good, 66.1% Fair, 5.3% Poor.
- 171
- Public bridges
- 28.7%
- Good condition
- 5.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Lewis County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 21%
- lowest Poor share in state
- 5.3%
- Poor-condition share
- 171
- public highway bridges
- 1990
- 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.
Lewis County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Lewis County ranks #24 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.3%). Lewis County, Missouri contains 171 public highway bridges. Roughly 28.7% are rated “Good,” 66.1% “Fair,” and 5.3% “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
28.7%
49 of 171 rated 7-9
Fair condition
66.1%
113 of 171 rated 5-6
Poor condition
5.3%
9 of 171 rated 4 or below
In-state Poor-share rank
#24 of 115
Among Missouri counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 171 NBI-tracked bridges by lowest applicable component rating.
Good 28.7% (49)
Fair 66.1% (113)
Poor 5.3% (9)
Lewis County's Poor-condition bridges carry 368 vehicle crossings a day
That is 0.2% of the county's reported daily bridge traffic on 5.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 41 crossings a day against 666 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 171 of 171 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
22.8% of Lewis County's bridges have passed the 50-year mark
39 of the 171 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 28.7% 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 34.8% of the county's Poor-condition bridge traffic
RT H S over MID FABIUS RVR, built 1961, carries 128 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 9-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 368 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Lewis County's bridges were built
171 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 5
1910–1919
5 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 4
1930–1939
4 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s 3
1950–1959
3 bridges
- 1960s 7
1960–1969
7 bridges
- 1970s 14
1970–1979
14 bridges
- 1980s 9
1980–1989
9 bridges
- 1990s
1990–1999
53 bridges
- 2000s
2000–2009
42 bridges
- 2010s 20
2010–2019
20 bridges
- 2020s 8
2020–2029
8 bridges
What this shows Construction peaked in the 1990s, when 53 of the county's bridges still in the inventory were built, which is 31% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1990, 11 years newer than the Missouri average of 1979.
How Lewis County compares with Missouri's closest counties by inventory size
The 5 Missouri counties nearest Lewis County in number of bridges, with their condition splits. Its 5.3% Poor share is the 2nd-lowest of these 6. Its average build year of 1990 against a peer-group mean of 1978 is 12 years newer.
Showing the 5 closest of 114 Missouri counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Clark County | 178 | 38.2% | 53.9% | 7.9% | 1986 |
| Lewis County (this page) | 171 | 28.7% | 66.1% | 5.3% | 1990 |
| Holt County | 167 | 38.3% | 46.7% | 15% | 1974 |
| Knox County | 167 | 34.7% | 61.1% | 4.2% | 1987 |
| Barry County | 166 | 23.5% | 61.4% | 15.1% | 1973 |
| St. Francois County | 165 | 38.2% | 51.5% | 10.3% | 1968 |
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 Lewis 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 Lewis County, both outside Missouri so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MO (171 bridges here).
- Crenshaw County, AL · 171 bridges
- Miami County, IN · 171 bridges
- Lincoln County, LA · 171 bridges
- Sanilac County, MI · 171 bridges
Similar average build year
Nearest mean year-built outside MO (1990 here).
- Maricopa County, AZ · avg 1990 · 2,847 bridges
- Tarrant County, TX · avg 1990 · 2,617 bridges
- Fairfax County, VA · avg 1990 · 751 bridges
- Guilford County, NC · avg 1990 · 736 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (171)
CR 433
GoodOver: UNNAMED CRK
S 35 T 63 N R 8 W, Lewis, MO
Built 2022 Load: 46.8 t ADT: 75
CR 305
GoodOver: UNNAMED CRK
S 14 T 61 N R 8 W, Lewis, MO
Built 2022 Load: 49.5 t ADT: 75
US 61 N
GoodOver: LINDEN BR
S 23 T 61 N R 6 W, Lewis, MO
Built 2001 Load: 50.4 t ADT: 7,505
COUNTY RD 585
GoodOver: N FABIUS RVR
S 19 T 60 N R 6 W, Lewis, MO
Built 2005 Load: 51.3 t ADT: 45
MO 16 E
GoodOver: SUGAR CR
S 25 T 62 N R 7 W, Lewis, MO
Built 2012 Load: 51.3 t ADT: 1,221
MO 16 E
GoodOver: MID FABIUS RVR
S 12 T 61 N R 8 W, Lewis, MO
Built 2017 Load: 51.3 t ADT: 1,182
COUNTY RD 226
GoodOver: TROUBLESOME CR
S 27 T 61 N R 9 W, Lewis, MO
Built 2009 Load: 53.1 t ADT: 25
MO 16 E
GoodOver: N FABIUS RVR
S 6 T 61 N R 7 W, Lewis, MO
Built 2017 Load: 54.0 t ADT: 1,348
COUNTY RD 336
GoodOver: MID FABIUS RVR
S 23 T 62 N R 9 W, Lewis, MO
Built 2018 Load: 57.6 t ADT: 15
US 61 N
GoodOver: WACONDA RVR
S 14 T 61 N R 6 W, Lewis, MO
Built 2001 Load: 60.3 t ADT: 7,505
COUNTY RD 412
GoodOver: SUGAR CR
S 23 T 62 N R 7 W, Lewis, MO
Built 2000 Load: 63.0 t ADT: 15
COUNTY RD 585
GoodOver: BR. N. FABIUS RVR
S 19 T 60 N R 6 E, Lewis, MO
Built 2023 Load: 65.7 t ADT: 35
COUNTY RD 429
PoorOver: WYACONDA RVR
S 17 T 62 N R 6 W, Lewis, MO
Built 1910 Load: 0.0 t ADT: 50
COUNTY RD 552
PoorOver: WYACONDA RVR
S 14 T 61 N R 6 W, Lewis, MO
Built 1900 Load: 0.0 t ADT: 15
COUNTY RD 504
PoorOver: MID FABIUS RVR
S 24 T 61 N R 8 W, Lewis, MO
Built 1920 Load: 5.4 t ADT: 35
COUNTY RD 526
PoorOver: SUGAR CR
S 6 T 61 N R 6 W, Lewis, MO
Built 1910 Load: 6.3 t ADT: 35
COUNTY RD 329
PoorOver: MID FABIUS RVR
S 5 T 61 N R 8 W, Lewis, MO
Built 1900 Load: 9.9 t ADT: 25
RT H S
PoorOver: MID FABIUS RVR
S 31 T 62 N R 8 W, Lewis, MO
Built 1961 Load: 9.9 t ADT: 128
COUNTY RD 597
PoorOver: OYSTER CR
S 6 T 60 N R 5 W, Lewis, MO
Built 1910 Load: 10.8 t ADT: 15
COUNTY RD 597
PoorOver: DRAIN DTCH TO MISS
S 19 T 60 N R 5 W, Lewis, MO
Built 1930 Load: 10.8 t ADT: 30
COUNTY RD 532
PoorOver: N FABIUS RVR
S 27 T 61 N R 7 W, Lewis, MO
Built 1915 Load: 13.5 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.