County profile · official public datasets

Grundy County, MO

187 public highway bridges tracked in the FHWA National Bridge Inventory: 54% rated Good, 34.8% Fair, 11.2% Poor.

187
Public bridges
54%
Good condition
11.2%
Poor condition

The verdict

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

Grundy 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 115 on Poor share
11.2%
Poor-condition share
187
public highway bridges
1992
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.

Grundy County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grundy County ranks #83 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 11.2%). Grundy County, Missouri contains 187 public highway bridges. Roughly 54% are rated “Good,” 34.8% “Fair,” and 11.2% “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

187

Public highway bridges in Grundy County

Good condition

54%

101 of 187 rated 7-9

Fair condition

34.8%

65 of 187 rated 5-6

Poor condition

11.2%

21 of 187 rated 4 or below

In-state Poor-share rank

#83 of 115

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

Condition distribution

Share of 187 NBI-tracked bridges by lowest applicable component rating.

Good
54% (101)
Fair
34.8% (65)
Poor
11.2% (21)

Grundy County's Poor-condition bridges carry 957 vehicle crossings a day

That is 1.7% of the county's reported daily bridge traffic on 11.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 46 crossings a day against 251 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 187 of 187 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

17.1% of Grundy County's bridges have passed the 50-year mark

32 of the 187 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 54% 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 28.3% of the county's Poor-condition bridge traffic

RT E E over MEDICINE CR DRAIN, built 1947, carries 271 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 21-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 957 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Grundy County's bridges were built

187 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 73 of the county's bridges still in the inventory were built, which is 39% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1992, 13 years newer than the Missouri average of 1979.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Grundy County compares with Missouri's closest counties by inventory size

The 5 Missouri counties nearest Grundy County in number of bridges, with their condition splits. Its 11.2% Poor share is the 5th-lowest of these 6. Its average build year of 1992 against a peer-group mean of 1978 is 14 years newer.

Showing the 5 closest of 114 Missouri counties eligible for comparison.

Bridge inventory size and condition shares for Grundy County and the 5 Missouri counties closest to it in inventory size
County Bridges Poor
Howell County 189 2.1%
Lincoln County 189 3.7%
Webster County 189 8.5%
Grundy County (this page) 187 11.2%
Marion County 186 9.1%
Livingston County 185 15.7%

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

Similar inventory size

Nearest county inventories outside MO (187 bridges here).

Similar average build year

Nearest mean year-built outside MO (1992 here).

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

All 187 Good 101 Fair 65 Poor 21

Poor-condition bridges (21)

NE 90TH ST

Poor

Over: BR OF HONEY CR

S 4 T 62 N R 23 W, Grundy, MO

Built 1920 Load: 0.0 t ADT: 5

NE 62ND ST

Poor

Over: BR W FK MEDICINE C

S 17 T 62 N R 22 W, Grundy, MO

Built 1900 Load: 0.0 t ADT: 5

NE 105TH ST

Poor

Over: UNNAMED STREAM

S 32 T 63 N R 22 W, Grundy, MO

Built 1940 Load: 5.4 t ADT: 10

NW 110TH ST

Poor

Over: LOST CR

S 22 T 63 N R 25 W, Grundy, MO

Built 1975 Load: 7.2 t ADT: 10

NE 110TH ST

Poor

Over: BIG NO CR

S 24 T 63 N R 23 W, Grundy, MO

Built 1965 Load: 7.2 t ADT: 15

SW 58TH ST

Poor

Over: BR HICKORY CR

S 9 T 60 N R 25 W, Grundy, MO

Built 1940 Load: 7.2 t ADT: 5

RT B E

Poor

Over: MUDDY CR

S 24 T 63 N R 24 W, Grundy, MO

Built 1952 Load: 9.0 t ADT: 260

SE 10TH ST

Poor

Over: BR MEDICINE CR

S 20 T 61 N R 22 W, Grundy, MO

Built 1950 Load: 11.7 t ADT: 5

RT C E

Poor

Over: WELDON FK GRAND RV

S 21 T 63 N R 24 W, Grundy, MO

Built 1936 Load: 14.4 t ADT: 201

NE 122ND ST

Poor

Over: E HONEY CR

S 16 T 63 N R 23 W, Grundy, MO

Built 1991 Load: 16.2 t ADT: 25

RT E E

Poor

Over: MEDICINE CR DRAIN

S 12 T 60 N R 23 W, Grundy, MO

Built 1947 Load: 16.2 t ADT: 271

SE 20TH ST

Poor

Over: NO CR

S 29 T 61 N R 23 W, Grundy, MO

Built 1930 Load: 21.6 t ADT: 30

NE 115TH ST

Poor

Over: HONEY CR

S 21 T 63 N R 23 W, Grundy, MO

Built 1994 Load: 24.3 t ADT: 5

NE 82ND ST

Poor

Over: W FK MEDICINE CR

S 4 T 62 N R 22 W, Grundy, MO

Built 1992 Load: 32.4 t ADT: 15

NE 105TH ST

Poor

Over: TRIB W FK MEDICINE

S 29 T 62 N R 22 W, Grundy, MO

Built 1991 Load: 34.2 t ADT: 20

NE 20TH AVE

Poor

Over: OWL BR MUDDY CR

S 13 T 62 N R 24 W, Grundy, MO

Built 1993 Load: 36.9 t ADT: 10

NE 100TH AVE

Poor

Over: W FK MEDICINE CR

S 19 T 62 N R 22 W, Grundy, MO

Built 1994 Load: 40.5 t ADT: 5

NE 105TH ST

Poor

Over: UNNAMED STREAM

S 20 T 62 N R 22 W, Grundy, MO

Built 1991 Load: 45.0 t ADT: 20

NE 115TH ST

Poor

Over: E HONEY CR

S 21 T 63 N R 23 W, Grundy, MO

Built 2003 Load: 58.5 t ADT: 5

SW 50TH ST

Poor

Over: GEE CR

S 21 T 60 N R 25 W, Grundy, MO

Built 2002 Load: 63.0 t ADT: 15

SE 60TH ST

Poor

Over: NO CR

S 20 T 60 N R 23 W, Grundy, MO

Built 1999 Load: 63.9 t ADT: 20

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
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.