County profile · official public datasets

Perry County, IL

136 public highway bridges tracked in the FHWA National Bridge Inventory: 38.2% rated Good, 54.4% Fair, 7.4% Poor.

136
Public bridges
38.2%
Good condition
7.4%
Poor condition

The verdict

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

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

Top 47%
lowest Poor share in state
7.4%
Poor-condition share
136
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.

Perry County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Perry County ranks #48 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.4%). Perry County, Illinois contains 136 public highway bridges. Roughly 38.2% are rated “Good,” 54.4% “Fair,” and 7.4% “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

136

Public highway bridges in Perry County

Good condition

38.2%

52 of 136 rated 7-9

Fair condition

54.4%

74 of 136 rated 5-6

Poor condition

7.4%

10 of 136 rated 4 or below

In-state Poor-share rank

#48 of 102

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

Condition distribution

Share of 136 NBI-tracked bridges by lowest applicable component rating.

Good
38.2% (52)
Fair
54.4% (74)
Poor
7.4% (10)

Perry County's Poor-condition bridges carry 9,425 vehicle crossings a day

That is 9% of the county's reported daily bridge traffic on 7.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 943 crossings a day against 734 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 136 of 136 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

18.4% of Perry County's bridges have passed the 50-year mark

25 of the 136 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 38.2% 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 61% of the county's Poor-condition bridge traffic

ILL 154 over BEAUCOUP CREEK, built 1962, carries 5,750 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 10-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 9,425 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Perry County's bridges were built

136 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 40 of the county's bridges still in the inventory were built, which is 29.4% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1981) matches the Illinois average (1979).

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

How Perry County compares with Illinois's closest counties by inventory size

The 5 Illinois counties nearest Perry County in number of bridges, with their condition splits. Its 7.4% Poor share is the 2nd-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1984 is in line with the group.

Showing the 5 closest of 101 Illinois counties eligible for comparison.

Bridge inventory size and condition shares for Perry County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Randolph County 149 7.4%
Henderson County 142 12%
Perry County (this page) 136 7.4%
Kendall County 132 12.1%
Massac County 132 8.3%
Monroe County 132 6.8%

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

Similar inventory size

Nearest county inventories outside IL (136 bridges here).

Similar average build year

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

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

All 136 Good 52 Fair 74 Poor 10

All bridges (136)

TR-92 (Crocus Rd)

Good

Over: Trib Little Galum Cr

T5S R3W SEC 17, Perry, IL

Built 2018 Load: 32.4 t ADT: 75

TR 172

Good

Over: BRANCH TO BEAUCOUP

2 MI SE PINCKNEYVILE, Perry, IL

Built 1980 Load: 32.4 t ADT: 75

TR 298

Good

Over: COLLIER CR

1.3 MI N CH 6, Perry, IL

Built 1984 Load: 32.4 t ADT: 50

TR 298

Good

Over: EATON CREEK

1.3 MI N CH 6, Perry, IL

Built 1984 Load: 32.4 t ADT: 50

TR 189 A

Good

Over: CHICKEN CR

0.5 MI W OF ILL 13, Perry, IL

Built 1984 Load: 32.4 t ADT: 300

TR 31

Good

Over: MUD CREEK

1 MI N SWANWICK, Perry, IL

Built 1900 Load: 32.7 t ADT: 75

ILL 154

Good

Over: BONNIE CREEK

2.2 MI.E OF150, Perry, IL

Built 1992 Load: 36.0 t ADT: 2,150

TR 109

Good

Over: TRIB TO BONNIE CREEK

2 MI N OF ILL RT 154, Perry, IL

Built 1900 Load: 36.3 t ADT: 125

TR 109

Good

Over: GALUM CREEK

1.3 MI E OF CH 12, Perry, IL

Built 1900 Load: 36.9 t ADT: 125

FAP 103-IL 13

Good

Over: GALUM CREEK

1 MI E RANDOLPH CO, Perry, IL

Built 2001 Load: 37.3 t ADT: 2,100

TR 19

Good

Over: MOORES BRANCH

1.25 MI N FAS 1822, Perry, IL

Built 1900 Load: 37.3 t ADT: 25

TR 190

Good

Over: WHITE WALNUT CR TRIB

3 MI NE PVILLE, Perry, IL

Built 1994 Load: 37.9 t ADT: 150

SAWMILL ROAD

Good

Over: BOARD TREE BRANCH

SEC 3 T4S R3W 3RD PM, Perry, IL

Built 2020 Load: 38.2 t ADT: 100

IL 4-FAP 686

Good

Over: TRIB TO COX CREEK

0.6 MI N WILLISVILLE, Perry, IL

Built 2002 Load: 39.2 t ADT: 2,550

ILL.154

Good

Over: LITTLE GALUM CREEK

2 MI.W OF (PVILLE), Perry, IL

Built 1992 Load: 39.5 t ADT: 2,550

FAP 42-IL 13/127

Good

Over: WALKERS CREEK

.09M N JKSN/PERRYCL, Perry, IL

Built 2000 Load: 39.5 t ADT: 3,750

ILL 154

Good

Over: PANTHER CREEK

3.4 MI W OF US 51, Perry, IL

Built 2011 Load: 39.9 t ADT: 4,000

FALCON ROAD

Good

Over: BEAUCOUP CREEK

1.0 MI W OF US 51, Perry, IL

Built 2019 Load: 40.2 t ADT: 50

FAP 42-IL 13/127

Good

Over: CHICKEN CREEK

SCL OF PINCKNEYVILLE, Perry, IL

Built 2001 Load: 41.8 t ADT: 4,700

PYATT CUTLER RD

Good

Over: LITTLE GALUM CREEK

4 MI W OF ILL 13, Perry, IL

Built 2019 Load: 42.4 t ADT: 600

TR 190

Good

Over: WHITE WALNUT CR

3.5 MI NE PVILLE, Perry, IL

Built 1994 Load: 42.8 t ADT: 150

ILL.154

Good

Over: GALUM CREEK

E OF ILL.150, Perry, IL

Built 1992 Load: 43.4 t ADT: 2,150

FAP 841-IL 154

Good

Over: LITTLE BEAUCOUP CR

1.2 MI W US 51, Perry, IL

Built 2001 Load: 43.7 t ADT: 4,000

FAP 841-ILL 154

Good

Over: REESE CREEK

1.2 MI E OF US 51, Perry, IL

Built 1985 Load: 45.0 t ADT: 2,750

FAP 42-IL 13/127

Good

Over: YOUNGS CREEK

1 MI N JACKSON CO, Perry, IL

Built 2000 Load: 48.6 t ADT: 3,750

GALUM OFFICE ROAD

Good

Over: STREAM

0.30MI NE PANDA BEAR, Perry, IL

Built 1984 Load: 82.6 t ADT: 10

TR 330

Poor

Over: HOG CREEK

0.1 MI S FAS 867, Perry, IL

Built 1940 Load: 0.0 t ADT: 25

CO HWY 1

Poor

Over: WHITE WALNUT CREEK

1.7 MI N ILL 154, Perry, IL

Built 1959 Load: 16.5 t ADT: 600

CO HWY 1

Poor

Over: LITTLE BEAUCOUP CRK

4 MI N OF ILL 154, Perry, IL

Built 1959 Load: 19.1 t ADT: 650

TR 110

Poor

Over: GALUM CREEK

1.2 MI S OF ILL 13, Perry, IL

Built 1900 Load: 19.4 t ADT: 25

COUNTY HIGHWAY 16

Poor

Over: TRIB TO HOG CREEK

1.0 MI SO.FAP 841, Perry, IL

Built 1985 Load: 24.0 t ADT: 50

CO HWY 11

Poor

Over: BEAUCOUP CREEK

2.1 MI E OF ILL 127, Perry, IL

Built 1955 Load: 27.2 t ADT: 250

CH 8-KIMZEY ROAD

Poor

Over: REESE CREEK

2.2 MI E OF US 51, Perry, IL

Built 1988 Load: 30.1 t ADT: 300

FAS 835-CH 12

Poor

Over: MUD CREEK

WASHINGTON CO LINE, Perry, IL

Built 1958 Load: 31.1 t ADT: 775

FAS-1824 (CH-27)

Poor

Over: SIXMILE CREEK

1 MI W OF US 51, Perry, IL

Built 1900 Load: 31.8 t ADT: 1,000

ILL 154

Poor

Over: BEAUCOUP CREEK

E OF PINCKNEYVILLE, Perry, IL

Built 1962 Load: 48.3 t ADT: 5,750

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.