Total bridges
151
Public highway bridges in Warren County
County profile · official public datasets
Warren County, MO
151 public highway bridges tracked in the FHWA National Bridge Inventory: 31.8% rated Good, 64.2% Fair, 4% Poor.
- 151
- Public bridges
- 31.8%
- Good condition
- 4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Warren 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
- 4%
- Poor-condition share
- 151
- public highway bridges
- 1986
- 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.
Warren County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Warren County ranks #12 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4%). Warren County, Missouri contains 151 public highway bridges. Roughly 31.8% are rated “Good,” 64.2% “Fair,” and 4% “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
31.8%
48 of 151 rated 7-9
Fair condition
64.2%
97 of 151 rated 5-6
Poor condition
4%
6 of 151 rated 4 or below
In-state Poor-share rank
#12 of 115
Among Missouri counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 151 NBI-tracked bridges by lowest applicable component rating.
Good 31.8% (48)
Fair 64.2% (97)
Poor 4% (6)
Warren County's Poor-condition bridges carry 2,447 vehicle crossings a day
That is 0.9% of the county's reported daily bridge traffic on 4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 408 crossings a day against 1,632 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 151 of 151 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
27.8% of Warren County's bridges have passed the 50-year mark
42 of the 151 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 31.8% 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 40.6% of the county's Poor-condition bridge traffic
RT A S over IS 70, built 1961, carries 994 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 6-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 2,447 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Warren County's bridges were built
151 bridges with a recorded construction year, grouped by decade
- 1900s 3
1900–1909
3 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s 8
1930–1939
8 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 12
1950–1959
12 bridges
- 1960s 10
1960–1969
10 bridges
- 1970s 8
1970–1979
8 bridges
- 1980s 13
1980–1989
13 bridges
- 1990s
1990–1999
25 bridges
- 2000s
2000–2009
37 bridges
- 2010s
2010–2019
26 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 2000s, when 37 of the county's bridges still in the inventory were built, which is 24.5% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1986, 7 years newer than the Missouri average of 1979.
How Warren County compares with Missouri's closest counties by inventory size
The 5 Missouri counties nearest Warren County in number of bridges, with their condition splits. Its 4% Poor share is the 1st-lowest of these 6. Its average build year of 1986 against a peer-group mean of 1976 is 10 years newer.
Showing the 5 closest of 114 Missouri counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Washington County | 157 | 33.8% | 56.1% | 10.2% | 1966 |
| Phelps County | 156 | 28.2% | 63.5% | 8.3% | 1968 |
| Clinton County | 152 | 34.9% | 55.3% | 9.9% | 1983 |
| Taney County | 151 | 31.1% | 58.9% | 9.9% | 1985 |
| Warren County (this page) | 151 | 31.8% | 64.2% | 4% | 1986 |
| McDonald County | 145 | 25.5% | 63.4% | 11% | 1976 |
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 Warren 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 Warren County, both outside Missouri so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MO (151 bridges here).
- Randolph County, AR · 151 bridges
- Pasco County, FL · 151 bridges
- St. Lucie County, FL · 151 bridges
- Hall County, GA · 151 bridges
Similar average build year
Nearest mean year-built outside MO (1986 here).
- El Paso County, TX · avg 1986 · 783 bridges
- Caddo County, LA · avg 1986 · 682 bridges
- Weld County, CO · avg 1986 · 614 bridges
- Polk County, IA · avg 1986 · 545 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (151)
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.