Total bridges
334
Public highway bridges in Boone County
County profile · official public datasets
Boone County, MO
334 public highway bridges tracked in the FHWA National Bridge Inventory: 49.4% rated Good, 46.7% Fair, 3.9% Poor.
- 334
- Public bridges
- 49.4%
- Good condition
- 3.9%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Boone County pairs a top-10% lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 10%
- lowest Poor share in state
- 3.9%
- Poor-condition share
- 334
- public highway bridges
- 1984
- 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.
Boone County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Boone County ranks #11 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.9%). Boone County, Missouri contains 334 public highway bridges. Roughly 49.4% are rated “Good,” 46.7% “Fair,” and 3.9% “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
49.4%
165 of 334 rated 7-9
Fair condition
46.7%
156 of 334 rated 5-6
Poor condition
3.9%
13 of 334 rated 4 or below
In-state Poor-share rank
#11 of 115
Among Missouri counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 334 NBI-tracked bridges by lowest applicable component rating.
Good 49.4% (165)
Fair 46.7% (156)
Poor 3.9% (13)
Boone County's Poor-condition bridges carry 53,532 vehicle crossings a day
That is 3% of the county's reported daily bridge traffic on 3.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,118 crossings a day against 4,748 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 334 of 334 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
26.3% of Boone County's bridges have passed the 50-year mark
88 of the 334 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 49.4% 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 42.6% of the county's Poor-condition bridge traffic
IS 70 E over PERCHE CR, built 1958, carries 22,820 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 13-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 53,532 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Boone County's bridges were built
334 bridges with a recorded construction year, grouped by decade
- 1920s 11
1920–1929
11 bridges
- 1930s 5
1930–1939
5 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s 26
1950–1959
26 bridges
- 1960s 21
1960–1969
21 bridges
- 1970s 32
1970–1979
32 bridges
- 1980s
1980–1989
105 bridges
- 1990s 26
1990–1999
26 bridges
- 2000s
2000–2009
46 bridges
- 2010s
2010–2019
43 bridges
- 2020s 12
2020–2029
12 bridges
What this shows Construction peaked in the 1980s, when 105 of the county's bridges still in the inventory were built, which is 31.4% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1984, 5 years newer than the Missouri average of 1979.
How Boone County compares with Missouri's closest counties by inventory size
The 5 Missouri counties nearest Boone County in number of bridges, with their condition splits. Its 3.9% Poor share is the 1st-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1983 is in line with the group.
Showing the 5 closest of 114 Missouri counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Boone County (this page) | 334 | 49.4% | 46.7% | 3.9% | 1984 |
| Franklin County | 331 | 38.7% | 56.8% | 4.5% | 1988 |
| Harrison County | 331 | 39.6% | 39% | 21.5% | 1981 |
| Bates County | 319 | 22.6% | 70.2% | 7.2% | 1977 |
| Audrain County | 314 | 41.4% | 53.8% | 4.8% | 1987 |
| Linn County | 313 | 39% | 43.5% | 17.6% | 1980 |
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 Boone 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 Boone County, both outside Missouri so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MO (334 bridges here).
- Dodge County, NE · 334 bridges
- Washoe County, NV · 334 bridges
- Shelby County, IL · 335 bridges
- Washington County, KS · 335 bridges
Similar average build year
Nearest mean year-built outside MO (1984 here).
- Hennepin County, MN · avg 1984 · 936 bridges
- Duval County, FL · avg 1984 · 831 bridges
- El Paso County, CO · avg 1984 · 686 bridges
- Bell County, TX · avg 1984 · 660 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (156)
US 63 N
FairOver: MO 763
S 13 T 49 N R 13 W, Boone, MO
Built 1992 Load: 36.9 t ADT: 7,129
US 63 S
FairOver: GANS CR
S 33 T 48 N R 12 W, Boone, MO
Built 1973 Load: 37.8 t ADT: 16,352
US 63 S
FairOver: RT B
S 32 T 49 N R 12 W, Boone, MO
Built 1986 Load: 37.8 t ADT: 11,528
CREED RD
FairOver: LICK FK CR
S 27 T 51 N R 13 W, Boone, MO
Built 1981 Load: 38.7 t ADT: 20
US 63 N
FairOver: GANS CR
S 33 T 48 N R 12 W, Boone, MO
Built 1968 Load: 38.7 t ADT: 14,469
US 63 N
FairOver: BONNE FEMME CR
S 3 T 47 N R 12 W, Boone, MO
Built 1968 Load: 38.7 t ADT: 14,469
RIVER RD
FairOver: HART CR
S 7 T 45 N R 12 W, Boone, MO
Built 1980 Load: 38.7 t ADT: 30
GANS CREEK RD
FairOver: GANS CR
S 4 T 47 N R 12 W, Boone, MO
Built 1981 Load: 38.7 t ADT: 100
SMITH HATCHERY RD
FairOver: LIT BONNE FEMME CR
S 33 T 47 N R 13 W, Boone, MO
Built 1981 Load: 38.7 t ADT: 100
US 63 S
FairOver: MO 763
S 13 T 49 N R 13 W, Boone, MO
Built 1985 Load: 38.7 t ADT: 6,375
RT VV S
FairOver: ROCKY FK CR
S 13 T 49 N R 13 W, Boone, MO
Built 1990 Load: 38.7 t ADT: 2,717
US 63 S
FairOver: BONNE FEMME CR
S 3 T 47 N R 12 W, Boone, MO
Built 1973 Load: 39.6 t ADT: 16,352
JUDY SCHOOL RD
FairOver: LIT CEDAR CR
S 22 T 49 N R 11 W, Boone, MO
Built 2004 Load: 39.6 t ADT: 50
MINOR HILL RD E
FairOver: STUB HOSS CR
S 35 T 47 N R 12 W, Boone, MO
Built 1962 Load: 39.6 t ADT: 98
US 63C S
FairOver: US 63
S 5 T 48 N R 12 W, Boone, MO
Built 1986 Load: 40.5 t ADT: 5,393
MO 124 E
FairOver: CT RR
S 9 T 51 N R 11 W, Boone, MO
Built 1994 Load: 40.5 t ADT: 4,252
MO 124 E
FairOver: SILVER FK CR
S 29 T 51 N R 11 W, Boone, MO
Built 1973 Load: 42.3 t ADT: 5,822
VANDIVER DR E
FairOver: US 63
S 1 T 48 N R 13 W, Boone, MO
Built 2002 Load: 42.3 t ADT: 5,001
RT UU E
FairOver: CR
S 7 T 48 N R 13 W, Boone, MO
Built 1960 Load: 42.3 t ADT: 2,014
MO 124 E
FairOver: BR OF SILVER FK
S 20 T 51 N R 11 W, Boone, MO
Built 1973 Load: 43.2 t ADT: 5,822
US 63 N
FairOver: ROCKY FK CR
S 13 T 49 N R 13 W, Boone, MO
Built 1992 Load: 43.2 t ADT: 9,201
IS 70 E
FairOver: HINKSON CREEK
S 8 T 48 N R 13 W, Boone, MO
Built 1949 Load: 43.2 t ADT: 24,608
IS 70 E
FairOver: SUGAR BR
S 10 T 48 N R 14 W, Boone, MO
Built 1958 Load: 43.2 t ADT: 37,883
US 63 S
FairOver: BASS CR
S 27 T 47 N R 12 W, Boone, MO
Built 1962 Load: 43.2 t ADT: 29,908
EAST BLVD
FairOver: HINKSON CR
S 8 T 48 N R 12 W, Boone, MO
Built 2017 Load: 44.1 t ADT: 2,000
IS 70 W
FairOver: RT J
S 9 T 48 N R 14 W, Boone, MO
Built 1985 Load: 45.0 t ADT: 19,001
US 63 S
FairOver: ROCKY FK CR
S 13 T 49 N R 13 W, Boone, MO
Built 1963 Load: 45.0 t ADT: 9,215
IS 70 E
FairOver: CEDAR CREEK
S 10 T 48 N R 11 W, Boone, MO
Built 1949 Load: 45.0 t ADT: 20,255
OR 70 E
FairOver: LIT CEDAR CR
S 8 T 48 N R 11 W, Boone, MO
Built 2011 Load: 45.9 t ADT: 671
RT F S
FairOver: SUGAR CREEK
S 8 T 51 N R 13 W, Boone, MO
Built 1961 Load: 45.9 t ADT: 717
OR 70 E
FairOver: HUTH CREEK
S 3 T 48 N R 13 W, Boone, MO
Built 2010 Load: 46.8 t ADT: 1,101
MO 163 S
FairOver: IS 70
S 1 T 48 N R 13 W, Boone, MO
Built 1957 Load: 46.8 t ADT: 16,600
WAGON TRAIL RD
FairOver: CLAYS FK
S 18 T 49 N R 12 W, Boone, MO
Built 1976 Load: 47.7 t ADT: 500
HELLER RD
FairOver: TRIB TO HINKSON CR
S 15 T 49 N R 12 W, Boone, MO
Built 1970 Load: 47.7 t ADT: 100
WYATT LANE
FairOver: NELSON CR
S 27 T 49 N R 12 W, Boone, MO
Built 1970 Load: 47.7 t ADT: 200
RICHLAND RD
FairOver: N FK GRINDSTONE CR
S 15 T 48 N R 12 W, Boone, MO
Built 1970 Load: 47.7 t ADT: 500
US 63 S
FairOver: SILVER FK CR
S 13 T 50 N R 13 W, Boone, MO
Built 1997 Load: 47.7 t ADT: 8,135
CLARK LN
FairOver: HOMINY BR
S 3 T 48 N R 12 W, Boone, MO
Built 2008 Load: 48.6 t ADT: 4,108
US 63 S
FairOver: BEAR CR
S 29 T 49 N R 12 W, Boone, MO
Built 1986 Load: 48.6 t ADT: 22,984
IS 70 E
FairOver: GRINDSTONE CR
S 11 T 48 N R 12 W, Boone, MO
Built 1949 Load: 48.6 t ADT: 43,990
SORRELS OVERPASS D
FairOver: IS 70
S 5 T 48 N R 13 W, Boone, MO
Built 1958 Load: 49.5 t ADT: 374
US 63 N
FairOver: RT B
S 32 T 49 N R 12 W, Boone, MO
Built 1986 Load: 49.5 t ADT: 16,925
SUGAR GROVE RD
FairOver: GANS CR
S 27 T 48 N R 12 W, Boone, MO
Built 1965 Load: 50.4 t ADT: 10
MILLBROOK DR
FairOver: GOODIN BR
S 20 T 48 N R 13 W, Boone, MO
Built 2004 Load: 52.2 t ADT: 100
RT WW E
FairOver: LIT CEDAR CR
S 29 T 48 N R 11 W, Boone, MO
Built 1993 Load: 52.2 t ADT: 4,063
RT TT E
FairOver: BR OF PERCHE CR
S 16 T 48 N R 13 W, Boone, MO
Built 1994 Load: 52.2 t ADT: 17,848
MO 163 S
FairOver: TURKEY CR
S 14 T 47 N R 12 W, Boone, MO
Built 2010 Load: 53.1 t ADT: 533
WAGON TRAIL RD S
FairOver: US 63
S 18 T 49 N R 12 W, Boone, MO
Built 1985 Load: 54.0 t ADT: 504
US 40 E
FairOver: MC GILL BR
S 1 T 48 N R 15 W, Boone, MO
Built 1924 Load: 54.0 t ADT: 4,196
MO 163 S
FairOver: CLEAR CR
S 6 T 47 N R 12 W, Boone, MO
Built 1999 Load: 54.9 t ADT: 3,464
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.