Total bridges
55
Public highway bridges in Logan County
County profile · official public datasets
Logan County, KS
55 public highway bridges tracked in the FHWA National Bridge Inventory: 60% rated Good, 36.4% Fair, 3.6% Poor.
- 55
- Public bridges
- 60%
- Good condition
- 3.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Logan County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 43%
- lowest Poor share in state
- 3.6%
- Poor-condition share
- 55
- public highway bridges
- 1967
- 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.
Logan County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Logan County ranks #45 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.6%). Logan County, Kansas contains 55 public highway bridges. Roughly 60% are rated “Good,” 36.4% “Fair,” and 3.6% “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
60%
33 of 55 rated 7-9
Fair condition
36.4%
20 of 55 rated 5-6
Poor condition
3.6%
2 of 55 rated 4 or below
In-state Poor-share rank
#45 of 104
Among Kansas counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 55 NBI-tracked bridges by lowest applicable component rating.
Good 60% (33)
Fair 36.4% (20)
Poor 3.6% (2)
Logan County's Poor-condition bridges carry 1,070 vehicle crossings a day
That is 2.7% of the county's reported daily bridge traffic on 3.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 535 crossings a day against 979 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 55 of 55 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
72.7% of Logan County's bridges have passed the 50-year mark
40 of the 55 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 60% 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 86.9% of the county's Poor-condition bridge traffic
US40 HWY over N FK SMOKY HILL RIVER, built 1957, carries 930 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 1,070 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Logan County's bridges were built
55 bridges with a recorded construction year, grouped by decade
- 1920s 2
1920–1929
2 bridges
- 1930s 3
1930–1939
3 bridges
- 1950s
1950–1959
19 bridges
- 1960s
1960–1969
12 bridges
- 1970s 5
1970–1979
5 bridges
- 1980s 7
1980–1989
7 bridges
- 1990s 4
1990–1999
4 bridges
- 2010s 1
2010–2019
1 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1950s, when 19 of the county's bridges still in the inventory were built, which is 34.5% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1967, 5 years older than the Kansas average of 1972.
How Logan County compares with Kansas's closest counties by inventory size
The 5 Kansas counties nearest Logan County in number of bridges, with their condition splits. Its 3.6% Poor share is the 4th-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1964 is in line with the group.
Showing the 5 closest of 103 Kansas counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Kearny County | 72 | 41.7% | 58.3% | 0% | 1968 |
| Edwards County | 69 | 26.1% | 69.6% | 4.3% | 1970 |
| Hamilton County | 68 | 88.2% | 11.8% | 0% | 1955 |
| Gray County | 66 | 66.7% | 33.3% | 0% | 1961 |
| Logan County (this page) | 55 | 60% | 36.4% | 3.6% | 1967 |
| Wallace County | 44 | 54.5% | 40.9% | 4.5% | 1966 |
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 Logan 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 Logan County, both outside Kansas so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside KS (55 bridges here).
- Park County, CO · 55 bridges
- Dixie County, FL · 55 bridges
- Winnebago County, IA · 55 bridges
- Gallatin County, KY · 55 bridges
Similar average build year
Nearest mean year-built outside KS (1967 here).
- Los Angeles County, CA · avg 1967 · 3,547 bridges
- Allegheny County, PA · avg 1967 · 1,294 bridges
- Sonoma County, CA · avg 1967 · 609 bridges
- Merced County, CA · avg 1967 · 528 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (55)
QUAIL RD (RS 127)
GoodOver: TURKEY CREEK
5.0S 2.0W OF MCALLASTER, Logan, KS
Built 1983 Load: 48.3 t ADT: 60
220 ROAD (RS 1417)
GoodOver: CHALK CREEK
13.9S 5.0W RUSSELL SPGS., Logan, KS
Built 1989 Load: 56.1 t ADT: 45
US-83 HIWAY
GoodOver: HACKBERRY CR S BR
0.41 MI N OF RS272, Logan, KS
Built 1998 Load: 95.3 t ADT: 1,918
160 ROAD (RS 246)
PoorOver: N. FORK SMOKY HILL RIVER
1.0N 1.0 E OF MCALLASTER, Logan, KS
Built 1928 Load: 18.6 t ADT: 140
US40 HWY
PoorOver: N FK SMOKY HILL RIVER
8.46MI NE WALLACE COLN, Logan, KS
Built 1957 Load: 35.4 t ADT: 930
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.