Total bridges
285
Public highway bridges in Platte County
County profile · official public datasets
Platte County, MO
285 public highway bridges tracked in the FHWA National Bridge Inventory: 38.9% rated Good, 55.1% Fair, 6% Poor.
- 285
- Public bridges
- 38.9%
- Good condition
- 6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Platte 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 24%
- lowest Poor share in state
- 6%
- Poor-condition share
- 285
- public highway bridges
- 1985
- 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.
Platte County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Platte County ranks #28 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6%). Platte County, Missouri contains 285 public highway bridges. Roughly 38.9% are rated “Good,” 55.1% “Fair,” and 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
38.9%
111 of 285 rated 7-9
Fair condition
55.1%
157 of 285 rated 5-6
Poor condition
6%
17 of 285 rated 4 or below
In-state Poor-share rank
#28 of 115
Among Missouri counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 285 NBI-tracked bridges by lowest applicable component rating.
Good 38.9% (111)
Fair 55.1% (157)
Poor 6% (17)
Platte County's Poor-condition bridges carry 81,999 vehicle crossings a day
That is 3% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,823 crossings a day against 9,101 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 285 of 285 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.3% of Platte County's bridges have passed the 50-year mark
95 of the 285 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 38.9% 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 44.9% of the county's Poor-condition bridge traffic
IS 29 S over OWL CR, built 1958, carries 36,821 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 17-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 81,999 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Platte County's bridges were built
285 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 4
1920–1929
4 bridges
- 1930s 10
1930–1939
10 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s
1950–1959
25 bridges
- 1960s
1960–1969
33 bridges
- 1970s
1970–1979
35 bridges
- 1980s
1980–1989
52 bridges
- 1990s
1990–1999
24 bridges
- 2000s
2000–2009
42 bridges
- 2010s
2010–2019
47 bridges
- 2020s 11
2020–2029
11 bridges
What this shows Construction peaked in the 1980s, when 52 of the county's bridges still in the inventory were built, which is 18.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1985, 6 years newer than the Missouri average of 1979.
How Platte County compares with Missouri's closest counties by inventory size
The 5 Missouri counties nearest Platte County in number of bridges, with their condition splits. Its 6% Poor share is the 2nd-lowest of these 6. Its average build year of 1985 against a peer-group mean of 1984 is in line with the group.
Showing the 5 closest of 114 Missouri counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Adair County | 301 | 60.8% | 32.6% | 6.6% | 1992 |
| Newton County | 300 | 39% | 54.3% | 6.7% | 1978 |
| Macon County | 291 | 42.6% | 49.8% | 7.6% | 1986 |
| Chariton County | 288 | 53.5% | 35.1% | 11.5% | 1976 |
| Platte County (this page) | 285 | 38.9% | 55.1% | 6% | 1985 |
| New Madrid County | 282 | 53.2% | 44.7% | 2.1% | 1986 |
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 Platte 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 Platte County, both outside Missouri so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MO (285 bridges here).
- Washington County, LA · 285 bridges
- Robeson County, NC · 285 bridges
- Haywood County, NC · 286 bridges
- Bryan County, OK · 286 bridges
Similar average build year
Nearest mean year-built outside MO (1985 here).
- Hillsborough County, FL · avg 1985 · 840 bridges
- Lancaster County, NE · avg 1985 · 661 bridges
- Nueces County, TX · avg 1985 · 528 bridges
- Grayson County, TX · avg 1985 · 513 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (17)
OLD N HWY
PoorOver: BRUSH CR
S 18 T 51 N R 34 W, Platte, MO
Built 1949 Load: 0.0 t ADT: 5
STANTON RD
PoorOver: SUGAR CR
S 35 T 55 N R 37 W, Platte, MO
Built 1920 Load: 0.0 t ADT: 60
SETTLES STATION RD
PoorOver: JOWLER CR
S 7 T 53 N R 34 W, Platte, MO
Built 1930 Load: 7.2 t ADT: 120
SHARP STATION-WEST
PoorOver: SMALL CR
S 13 T 53 N R 35 W, Platte, MO
Built 1950 Load: 8.1 t ADT: 250
NORTH COUNTY LINE
PoorOver: BR OF GROVE CR
S 16 T 54 N R 33 W, Platte, MO
Built 1920 Load: 16.2 t ADT: 110
SOUTH COUNTY LINE
PoorOver: SMALL CR
S 34 T 54 N R 33 W, Platte, MO
Built 1921 Load: 16.2 t ADT: 225
RT B S
PoorOver: GROVE CR
S 8 T 54 N R 33 W, Platte, MO
Built 1962 Load: 16.2 t ADT: 1,593
GRADEN RD
PoorOver: PIED CR
S 26 T 51 N R 34 W, Platte, MO
Built 1968 Load: 18.0 t ADT: 800
S CROOKED RD
PoorOver: RUSH CR
S 27 T 51 N R 34 W, Platte, MO
Built 1967 Load: 18.9 t ADT: 1,493
NE 108TH ST
PoorOver: SECOND CR
S 30 T 52 N R 33 W, Platte, MO
Built 1930 Load: 21.6 t ADT: 1,218
RT Z E
PoorOver: PLATTE RVR
S 1 T 54 N R 34 W, Platte, MO
Built 1966 Load: 21.6 t ADT: 867
WAUKOMIS DR
PoorOver: LINE CR
S 28 T 51 N R 33 W, Platte, MO
Built 1930 Load: 24.3 t ADT: 4,479
IS 29 N
PoorOver: PLATTE RVR
S 25 T 53 N R 35 W, Platte, MO
Built 1959 Load: 29.7 t ADT: 26,006
NW COOKINGHAM DR E
PoorOver: IS 435
S 21 T 52 N R 33 W, Platte, MO
Built 1977 Load: 32.4 t ADT: 1,056
RT D E
PoorOver: FOX CR
S 19 T 52 N R 34 W, Platte, MO
Built 1962 Load: 32.4 t ADT: 102
MO 92 E
PoorOver: PLATTE RVR
S 25 T 53 N R 35 W, Platte, MO
Built 1995 Load: 39.6 t ADT: 6,794
IS 29 S
PoorOver: OWL CR
S 25 T 54 N R 35 W, Platte, MO
Built 1958 Load: 99.9 t ADT: 36,821
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.