County profile · official public datasets

Harrison County, MO

331 public highway bridges tracked in the FHWA National Bridge Inventory: 39.6% rated Good, 39% Fair, 21.5% Poor.

331
Public bridges
39.6%
Good condition
21.5%
Poor condition

The verdict

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

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

113th
of 115 on Poor share
21.5%
Poor-condition share
331
public highway bridges
1981
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.

Harrison County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Harrison County ranks #113 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 21.5%). Harrison County, Missouri contains 331 public highway bridges. Roughly 39.6% are rated “Good,” 39% “Fair,” and 21.5% “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.

Total bridges

331

Public highway bridges in Harrison County

Good condition

39.6%

131 of 331 rated 7-9

Fair condition

39%

129 of 331 rated 5-6

Poor condition

21.5%

71 of 331 rated 4 or below

In-state Poor-share rank

#113 of 115

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

Condition distribution

Share of 331 NBI-tracked bridges by lowest applicable component rating.

Good
39.6% (131)
Fair
39% (129)
Poor
21.5% (71)

Harrison County's Poor-condition bridges carry 13,141 vehicle crossings a day

That is 6.8% of the county's reported daily bridge traffic on 21.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 185 crossings a day against 151 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 331 of 331 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

38.7% of Harrison County's bridges have passed the 50-year mark

128 of the 331 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 39.6% 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 37.3% of the county's Poor-condition bridge traffic

US 136 E over IS 35, built 1973, carries 4,896 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 71-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 13,141 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Harrison County's bridges were built

331 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2000s, when 63 of the county's bridges still in the inventory were built, which is 19% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1981) matches the Missouri average (1979).

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

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

The 5 Missouri counties nearest Harrison County in number of bridges, with their condition splits. Its 21.5% Poor share is the 6th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1983 is in line with the group.

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

Bridge inventory size and condition shares for Harrison County and the 5 Missouri counties closest to it in inventory size
County Bridges Poor
Boone County 334 3.9%
Franklin County 331 4.5%
Harrison County (this page) 331 21.5%
Bates County 319 7.2%
Audrain County 314 4.8%
Linn County 313 17.6%

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

Similar inventory size

Nearest county inventories outside MO (331 bridges here).

Similar average build year

Nearest mean year-built outside MO (1981 here).

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

All 331 Good 131 Fair 129 Poor 71

Good-condition bridges (131)

US 136 E

Good

Over: POLECAT CR

S 7 T 63 N R 27 W, Harrison, MO

Built 1992 Load: 43.2 t ADT: 3,166

W 182 ST

Good

Over: W FK BIG CR

S 10 T 65 N R 28 W, Harrison, MO

Built 2001 Load: 44.1 t ADT: 20

W 350 ST

Good

Over: FLEENAR BR

S 31 T 63 N R 28 W, Harrison, MO

Built 2001 Load: 44.1 t ADT: 35

W 110 AVE

Good

Over: LOTTS CR

S 7 T 66 N R 29 W, Harrison, MO

Built 2003 Load: 44.1 t ADT: 30

E 300TH ST

Good

Over: POLE CAT CR

S 4 T 63 N R 27 W, Harrison, MO

Built 2009 Load: 44.1 t ADT: 40

E 400TH ST

Good

Over: MUDDY CR

S 25 T 62 N R 27 W, Harrison, MO

Built 2011 Load: 44.1 t ADT: 25

W 200 ST

Good

Over: LITTLE CR

S 20 T 65 N R 28 W, Harrison, MO

Built 1993 Load: 45.0 t ADT: 35

E 195 ST

Good

Over: E FK BIG CR

S 17 T 65 N R 27 W, Harrison, MO

Built 1996 Load: 45.0 t ADT: 20

E 330 ST

Good

Over: POLECAT CR

S 24 T 63 N R 28 W, Harrison, MO

Built 1998 Load: 45.0 t ADT: 20

190TH ST

Good

Over: BIG MUDDY CR

S 9 T 65 N R 29 W, Harrison, MO

Built 2007 Load: 45.0 t ADT: 15

E 340 ST

Good

Over: CYPRESS CR

S 29 T 63 N R 27 W, Harrison, MO

Built 2002 Load: 45.9 t ADT: 35

E 315TH ST

Good

Over: CAT CR

S 15 T 63 N R 26 W, Harrison, MO

Built 2011 Load: 45.9 t ADT: 15

E 122 ST

Good

Over: E FK BIG CR

S 11 T 66 N R 27 W, Harrison, MO

Built 1994 Load: 46.8 t ADT: 25

US 136 E

Good

Over: SAMPSON CR

S 17 T 63 N R 29 W, Harrison, MO

Built 2002 Load: 46.8 t ADT: 2,329

W 190 ST

Good

Over: LITTLE CR

S 17 T 65 N R 28 W, Harrison, MO

Built 2013 Load: 46.8 t ADT: 15

E 340TH ST

Good

Over: CAT CR

S 26 T 63 N R 26 W, Harrison, MO

Built 2016 Load: 46.8 t ADT: 30

RT P E

Good

Over: WHITE OAK CREEK

S 9 T 62 N R 29 W, Harrison, MO

Built 2020 Load: 46.8 t ADT: 50

W 210 ST

Good

Over: BIG MUDDY CR

S 20 T 65 N R 29 W, Harrison, MO

Built 1996 Load: 47.7 t ADT: 15

E 245 ST

Good

Over: E FK BIG CR

S 7 T 64 N R 27 W, Harrison, MO

Built 2005 Load: 48.6 t ADT: 35

E 290 AVE

Good

Over: QUARRY CR

S 18 T 66 N R 26 W, Harrison, MO

Built 1993 Load: 49.5 t ADT: 20

W 180TH ST

Good

Over: BIG MUDDY CR

S 3 T 65 N R 29 W, Harrison, MO

Built 2010 Load: 50.4 t ADT: 15

E 350 ST

Good

Over: BR OF CAT CR

S 35 T 63 N R 26 W, Harrison, MO

Built 1930 Load: 51.3 t ADT: 35

E 120 ST

Good

Over: ZADIES CR

S 3 T 66 N R 27 W, Harrison, MO

Built 1994 Load: 53.1 t ADT: 30

W 182 ST

Good

Over: SHAIN CR

S 12 T 65 N R 28 W, Harrison, MO

Built 2005 Load: 54.0 t ADT: 50

W 390TH ST

Good

Over: BR OF NOBLE BR

S 19 T 62 N R 28 W, Harrison, MO

Built 2014 Load: 54.0 t ADT: 15

US 136 E

Good

Over: PANTHER CR

S 24 T 64 N R 26 W, Harrison, MO

Built 1997 Load: 54.0 t ADT: 1,080

W 120TH ST

Good

Over: WOLF CR

S 4 T 66 N R 28 W, Harrison, MO

Built 2009 Load: 59.4 t ADT: 55

E 280 AVE

Good

Over: ROCK HOUSE LK

S 35 T 65 N R 27 W, Harrison, MO

Built 1993 Load: 77.4 t ADT: 20

W 290TH

Good

Over: BR OF WHITE OAK CR

S 2 T 63 N R 29 W, Harrison, MO

Built 2016 Load: 78.3 t ADT: 20

W 185 AVE

Good

Over: TRIB OF BIG CR

S 17 T 63 N R 28 W, Harrison, MO

Built 2013 Load: 82.8 t ADT: 35

E 215 ST

Good

Over: TRIB E FK BIG CR

S 28 T 65 N R 27 W, Harrison, MO

Built 1992 Load: 97.2 t ADT: 25

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

Related

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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.