Total bridges
129
Public highway bridges in Doniphan County
County profile · official public datasets
Doniphan County, KS
129 public highway bridges tracked in the FHWA National Bridge Inventory: 50.4% rated Good, 41.1% Fair, 8.5% Poor.
- 129
- Public bridges
- 50.4%
- Good condition
- 8.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Doniphan County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- 83rd
- of 104 on Poor share
- 8.5%
- Poor-condition share
- 129
- public highway bridges
- 1977
- 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.
Doniphan County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Doniphan County ranks #83 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.5%). Doniphan County, Kansas contains 129 public highway bridges. Roughly 50.4% are rated “Good,” 41.1% “Fair,” and 8.5% “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
50.4%
65 of 129 rated 7-9
Fair condition
41.1%
53 of 129 rated 5-6
Poor condition
8.5%
11 of 129 rated 4 or below
In-state Poor-share rank
#83 of 104
Among Kansas counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 129 NBI-tracked bridges by lowest applicable component rating.
Good 50.4% (65)
Fair 41.1% (53)
Poor 8.5% (11)
Doniphan County's Poor-condition bridges carry 3,328 vehicle crossings a day
That is 3.5% of the county's reported daily bridge traffic on 8.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 303 crossings a day against 950 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 129 of 129 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
39.5% of Doniphan County's bridges have passed the 50-year mark
51 of the 129 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 50.4% 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 73.2% of the county's Poor-condition bridge traffic
RS 2128 over MISSION CREEK, built 1939, carries 2,435 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 11-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 3,328 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Doniphan County's bridges were built
129 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 2
1910–1919
2 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s 7
1930–1939
7 bridges
- 1940s 2
1940–1949
2 bridges
- 1950s
1950–1959
11 bridges
- 1960s
1960–1969
14 bridges
- 1970s
1970–1979
17 bridges
- 1980s
1980–1989
22 bridges
- 1990s
1990–1999
24 bridges
- 2000s
2000–2009
14 bridges
- 2010s 8
2010–2019
8 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1990s, when 24 of the county's bridges still in the inventory were built, which is 18.6% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1977, 5 years newer than the Kansas average of 1972.
How Doniphan County compares with Kansas's closest counties by inventory size
The 5 Kansas counties nearest Doniphan County in number of bridges, with their condition splits. Its 8.5% Poor share is the 4th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1973 is in line with the group.
Showing the 5 closest of 103 Kansas counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Graham County | 142 | 52.8% | 39.4% | 7.7% | 1968 |
| Geary County | 140 | 46.4% | 43.6% | 10% | 1972 |
| Chautauqua County | 130 | 41.5% | 47.7% | 10.8% | 1964 |
| Doniphan County (this page) | 129 | 50.4% | 41.1% | 8.5% | 1977 |
| Stafford County | 119 | 50.4% | 46.2% | 3.4% | 1979 |
| Pratt County | 118 | 65.3% | 34.7% | 0% | 1981 |
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 Doniphan 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 Doniphan County, both outside Kansas so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside KS (129 bridges here).
- Clay County, AL · 129 bridges
- Cross County, AR · 129 bridges
- Lake County, CA · 129 bridges
- Lincoln County, CO · 129 bridges
Similar average build year
Nearest mean year-built outside KS (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (11)
MINOR T-35-1
PoorOver: SQUAW CREEK
4.5W OF SEVERENCE, Doniphan, KS
Built 1968 Load: 2.4 t ADT: 40
LOCAL T-228-3
PoorOver: COTTONWOOD CREEK
3.5E 1.7S OF BENDENA, Doniphan, KS
Built 1900 Load: 2.9 t ADT: 2
LOCAL T-831-2
PoorOver: C. R.I.& &. RAILROAD
2.5E OF TROY, Doniphan, KS
Built 1923 Load: 3.4 t ADT: 100
LOCAL T-538-2
PoorOver: TRIB. TO MISSOURI RIVER
3.6N 3.0E OF TROY, Doniphan, KS
Built 1970 Load: 4.2 t ADT: 10
RS 1784
PoorOver: STREAM
0.5S OF SPARKS, Doniphan, KS
Built 1973 Load: 10.6 t ADT: 66
LOCAL T-731-1
PoorOver: MOSQUITO CREEK
W. END OF TROY, Doniphan, KS
Built 1920 Load: 14.5 t ADT: 5
LOCAL T-723-1
PoorOver: TRIB. TO MISSOURI RIVER
4.0N 3.9E OF TROY, Doniphan, KS
Built 1965 Load: 15.6 t ADT: 5
LOCAL T-433-1
PoorOver: DUNCAN CREEK
N. END OF BLAIR, Doniphan, KS
Built 1923 Load: 16.1 t ADT: 35
RS 201
PoorOver: STREAM
3.0W 0.2S OF DENTON, Doniphan, KS
Built 1959 Load: 24.3 t ADT: 175
RS 2128
PoorOver: MISSION CREEK
0.6E OF HIGHLAND, Doniphan, KS
Built 1939 Load: 25.0 t ADT: 2,435
K7 HWY
PoorOver: MILL CREEK
12.45 M NW WJCT US-36/K-7, Doniphan, KS
Built 1949 Load: 26.3 t ADT: 455
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.