County profile · official public datasets

Wyandotte County, KS

315 public highway bridges tracked in the FHWA National Bridge Inventory: 62.5% rated Good, 34.6% Fair, 2.9% Poor.

315
Public bridges: 62.5%
Good condition: 2.9%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Wyandotte County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 34%
lowest Poor share in state: 2.9%
Poor-condition share: 315
public highway bridges: 1980
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.

Wyandotte County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Wyandotte County ranks #35 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.9%). Wyandotte County, Kansas contains 315 public highway bridges. Roughly 62.5% are rated “Good,” 34.6% “Fair,” and 2.9% “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.

Total bridges

315

Public highway bridges in Wyandotte County

Good condition

62.5%

197 of 315 rated 7-9

Fair condition

34.6%

109 of 315 rated 5-6

Poor condition

2.9%

9 of 315 rated 4 or below

In-state Poor-share rank

#35 of 104

Among Kansas counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 315 NBI-tracked bridges by lowest applicable component rating.

Good

62.5% (197)

Fair

34.6% (109)

Poor

2.9% (9)

Wyandotte County's Poor-condition bridges carry 81,528 vehicle crossings a day

That is 1.9% of the county's reported daily bridge traffic on 2.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 9,059 crossings a day against 13,812 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 313 of 315 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

36.5% of Wyandotte County's bridges have passed the 50-year mark

115 of the 315 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 62.5% 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 25.5% of the county's Poor-condition bridge traffic

I-70 EB HIGHWAY over KANSAS RIVER 3 RR 5 ST, built 1907, carries 20,800 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 9-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 81,528 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1920s

2
1930s

7
1940s

4
1950s

35
1960s

34
1970s

54
1980s

91
1990s

28
2000s

44
2010s

14
2020s

1

What this shows Construction peaked in the 1980s, when 91 of the county's bridges still in the inventory were built, which is 28.9% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1980, 8 years newer than the Kansas average of 1972.

How Wyandotte County compares with Kansas's closest counties by inventory size

The 5 Kansas counties nearest Wyandotte County in number of bridges, with their condition splits. Its 2.9% Poor share is the 2nd-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1970 is 10 years newer.

Showing the 5 closest of 103 Kansas counties eligible for comparison.

Bridge inventory size and condition shares for Wyandotte County and the 5 Kansas counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Marion County	324	39.2%	51.2%	9.6%	1959
Cherokee County	317	42.6%	53%	4.4%	1967
Wyandotte County (this page)	315	62.5%	34.6%	2.9%	1980
Cloud County	314	52.5%	40.8%	6.7%	1961
Douglas County	314	78%	21.3%	0.6%	1989
Jewell County	307	57.3%	35.5%	7.2%	1972

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 Wyandotte 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 Wyandotte County, both outside Kansas so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside KS (315 bridges here).

Saginaw County, MI · 315 bridges
Miami County, OH · 315 bridges
Monroe County, PA · 315 bridges
Buchanan County, IA · 316 bridges

Similar average build year

Nearest mean year-built outside KS (1980 here).

Tulsa County, OK · avg 1980 · 1,135 bridges
Miami-Dade County, FL · avg 1980 · 1,057 bridges
Pulaski County, AR · avg 1980 · 721 bridges
McLennan County, TX · avg 1980 · 714 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 315 Good 197 Fair 109 Poor 9

Fair-condition bridges (109)

Sort:

Wyandotte County Bridge Snapshot

Condition distribution

Wyandotte County's Poor-condition bridges carry 81,528 vehicle crossings a day

36.5% of Wyandotte County's bridges have passed the 50-year mark

One structure carries 25.5% of the county's Poor-condition bridge traffic

How Wyandotte County compares with Kansas's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (109)

US169 HWY NB

I-435 Hwy SB

I-435 Hwy SB

I-635 HIGHWAY

I-435 SB HIGHWAY

I-435 NB HIGHWAY

I435 HWY NB

I-435 Hwy SB

I70 WB TO I435 NB

115TH STREET

JAMES STREET

ORVILLE AVE

K-32 HIGHWAY

LEAVENWORTH ROAD

K-32 WB HIGHWAY

K-32 EB HIGHWAY

I-70 WB HWY (KTA

I-70 EB HWY (KTA

I-635 NB HIGHWAY

I635 HWY

I-435 Hwy SB

I-635 NB HIGHWAY

US69 (18TH ST) SB

I-435 NB HIGHWAY

I-435 HIGHWAY SB

METROPOLITAN AVE

I-435 NB HIGHWAY

US69 HWY

I-435 SB HIGHWAY

I35 HWY SB

I35 HWY NB

I-70 EB HIGHWAY

I-70 WB HWY (KTA

US-24 WB OVER KTA

69 HWY (18TH ST)

I-435 SOUTHBOUND

I435 HWY NB

I-635 SB HIGHWAY

I-435 Hwy SB

I-635 SB HIGHWAY

I-635 NB HIGHWAY

K-5 HIGHWAY

K7 HWY S-BND

SB I435 TO WB I70

27TH STREET

MINN AVE

I70 WB OLD K-32 RP

MILL ST

I-435 HWY NB

I-435 HWY SB

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