County profile · official public datasets

Marshall County, KS

402 public highway bridges tracked in the FHWA National Bridge Inventory: 49.8% rated Good, 39.6% Fair, 10.7% Poor.

402
Public bridges: 49.8%
Good condition: 10.7%
Poor condition

The verdict

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

Marshall County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

95th
of 104 on Poor share: 10.7%
Poor-condition share: 402
public highway bridges: 1974
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.

Marshall County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Marshall County ranks #95 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.7%). Marshall County, Kansas contains 402 public highway bridges. Roughly 49.8% are rated “Good,” 39.6% “Fair,” and 10.7% “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

402

Public highway bridges in Marshall County

Good condition

49.8%

200 of 402 rated 7-9

Fair condition

39.6%

159 of 402 rated 5-6

Poor condition

10.7%

43 of 402 rated 4 or below

In-state Poor-share rank

#95 of 104

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

Condition distribution

Share of 402 NBI-tracked bridges by lowest applicable component rating.

Good

49.8% (200)

Fair

39.6% (159)

Poor

10.7% (43)

Marshall County's Poor-condition bridges carry 2,478 vehicle crossings a day

That is 3.1% of the county's reported daily bridge traffic on 10.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 58 crossings a day against 272 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 401 of 402 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

43.3% of Marshall County's bridges have passed the 50-year mark

174 of the 402 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 49.8% 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 29.5% of the county's Poor-condition bridge traffic

K9 HWY over ROBIDOUX CREEK, built 1962, carries 730 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 43-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 2,478 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

6
1910s

11
1920s

7
1930s

56
1940s

43
1950s

17
1960s

23
1970s

22
1980s

39
1990s

64
2000s

60
2010s

40
2020s

14

What this shows Construction peaked in the 1990s, when 64 of the county's bridges still in the inventory were built, which is 15.9% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1974) matches the Kansas average (1972).

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

The 5 Kansas counties nearest Marshall County in number of bridges, with their condition splits. Its 10.7% Poor share is the 6th-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1971 is in line with the group.

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

Bridge inventory size and condition shares for Marshall County and the 5 Kansas counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Marshall County (this page)	402	49.8%	39.6%	10.7%	1974
Kingman County	391	48.3%	45.8%	5.9%	1976
Dickinson County	375	47.7%	47.2%	5.1%	1974
Harper County	372	25%	65.3%	9.7%	1965
Harvey County	372	57.3%	35.5%	7.3%	1971
Saline County	369	68.6%	29.5%	1.9%	1971

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

Similar inventory size

Nearest county inventories outside KS (402 bridges here).

Cuming County, NE · 402 bridges
Allegany County, NY · 402 bridges
Wilson County, TN · 402 bridges
San Luis Obispo County, CA · 401 bridges

Similar average build year

Nearest mean year-built outside KS (1974 here).

Knox County, TN · avg 1974 · 588 bridges
Summit County, OH · avg 1974 · 563 bridges
Onondaga County, NY · avg 1974 · 472 bridges
Orange County, NY · avg 1974 · 472 bridges

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

All 402 Good 200 Fair 159 Poor 43

All bridges (402)

Sort:

Marshall County Bridge Snapshot

Condition distribution

Marshall County's Poor-condition bridges carry 2,478 vehicle crossings a day

43.3% of Marshall County's bridges have passed the 50-year mark

One structure carries 29.5% of the county's Poor-condition bridge traffic

How Marshall 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

All bridges (402)

3RD RD (2.0-B.4)

28TH RD (27.0-A.0)

14TH RD (13.0-A.6)

PARALLEL 5.0-DD.9

RS1211 ENT LT

23RD RD (22.0-L.5)

BISON RD (8.1-C.2)

TUMBLEWEED(RS1235)

HARVEST (27.7-I.0)

DOGWOOD(29.4-DD.0)

5TH RD (4.0-H.7)

DEER TRL (3.0-D.9)

15TH RD (14.0-H.9)

16TH RD (15.0-A.5)

28TH RD (27.0-L.4)

QUAIL RD(23.9-R.0)

US77 HWY

15TH RD. 14.0-X.2

JAYHAWK (22.4-K.0)

K-9 HWY

BISON RD(23.7-C.0)

5TH RD. 4.0-K.9

6TH RD (5.0-A.9)

HARVEST (5.4-H.7)

HARVEST 13.9-I.0

LIMESTONE(21.1-M.0

LIMESTONE_11.3-L.7

5TH RD. 4.0-Z.5

ZENITH (26.5-Z.0)

29TH RD (28.0-BB.2

29TH RD (28.0-G.6)

7TH RD. 6.0-M.1

TEMPLE (22.3-U.5)

9TH RD. 8.0-AA.8

K99 HWY

29TH RD (28.0-E.6)

17TH RD (16.0-D.2)

4TH RD (3.0-H.7)

27TH RD (26.0-F.9)

FRONTIER(22.6-G.0)

PAWNEE (29.6-Q.5)

US 77 HWY

7TH RD. 6.2-V.2

GRANITE RD. 20.1-H

25TH RD (24.0-Q.1)

29TH RD (28.0-L.7)

LOCAL 6.6-N.7

K233 HWY

11th RD (10.4-S.6)

MINOR 14.9-U.0

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