County profile · official public datasets

Peoria County, IL

352 public highway bridges tracked in the FHWA National Bridge Inventory: 24.1% rated Good, 57.7% Fair, 18.2% Poor.

352
Public bridges: 24.1%
Good condition: 18.2%
Poor condition

The verdict

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

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

96th
of 102 on Poor share: 18.2%
Poor-condition share: 352
public highway bridges: 1983
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.

Peoria County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Peoria County ranks #96 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 18.2%). Peoria County, Illinois contains 352 public highway bridges. Roughly 24.1% are rated “Good,” 57.7% “Fair,” and 18.2% “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

352

Public highway bridges in Peoria County

Good condition

24.1%

85 of 352 rated 7-9

Fair condition

57.7%

203 of 352 rated 5-6

Poor condition

18.2%

64 of 352 rated 4 or below

In-state Poor-share rank

#96 of 102

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

Condition distribution

Share of 352 NBI-tracked bridges by lowest applicable component rating.

Good

24.1% (85)

Fair

57.7% (203)

Poor

18.2% (64)

Peoria County's Poor-condition bridges carry 389,935 vehicle crossings a day

That is 22.8% of the county's reported daily bridge traffic on 18.2% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 6,093 crossings a day against 1,498 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 351 of 352 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

30.1% of Peoria County's bridges have passed the 50-year mark

106 of the 352 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 24.1% 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 7.7% of the county's Poor-condition bridge traffic

US 150 WB over IL 29, built 1995, carries 30,000 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 64-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 389,935 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

2
1910s

2
1920s

9
1930s

10
1940s

7
1950s

14
1960s

52
1970s

56
1980s

54
1990s

50
2000s

57
2010s

31
2020s

8

What this shows Construction peaked in the 2000s, when 57 of the county's bridges still in the inventory were built, which is 16.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1983) matches the Illinois average (1979).

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

The 5 Illinois counties nearest Peoria County in number of bridges, with their condition splits. Its 18.2% Poor share is the 6th-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1981 is in line with the group.

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

Bridge inventory size and condition shares for Peoria County and the 5 Illinois counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Tazewell County	358	25.4%	60.1%	14.5%	1976
Fayette County	357	56.6%	38.4%	5%	1976
Peoria County (this page)	352	24.1%	57.7%	18.2%	1983
Macon County	346	25.7%	58.7%	15.6%	1984
DuPage County	344	37.5%	54.4%	8.1%	1985
Kankakee County	344	40.1%	53.5%	6.4%	1982

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

Similar inventory size

Nearest county inventories outside IL (352 bridges here).

Henrico County, VA · 352 bridges
Union County, NC · 353 bridges
Weakley County, TN · 351 bridges
Whatcom County, WA · 354 bridges

Similar average build year

Nearest mean year-built outside IL (1983 here).

Dallas County, TX · avg 1983 · 3,230 bridges
Bexar County, TX · avg 1983 · 2,342 bridges
Sedgwick County, KS · avg 1983 · 1,333 bridges
Bernalillo County, NM · avg 1983 · 496 bridges

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

All 352 Good 85 Fair 203 Poor 64

Fair-condition bridges (203)

Sort:

Peoria County Bridge Snapshot

Condition distribution

Peoria County's Poor-condition bridges carry 389,935 vehicle crossings a day

30.1% of Peoria County's bridges have passed the 50-year mark

One structure carries 7.7% of the county's Poor-condition bridge traffic

How Peoria County compares with Illinois'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 (203)

PARK ROAD

MURPHY ROAD

ROME WEST RD

NB ILL 6

LK CAMELOT DR-TR 7

PARKS SCHOOL ROAD

PARKS SCH RD

ILL 8

ANDERSON RD

HICKS HOLLOW RD

ILL 29

FARMINGTON RD

BOY SCOUT ROAD

PARKS SCHOOL ROAD

MOSSVILLE RD-CH D3

LANCASTER ROAD

TR-17A (SANTA FE R

BRIMFIELD RD-CH R2

PARK ROAD

ILL 8

ILL 8

SANTA FE ROAD

EB I-74 & RAMP

ILL 17

FAI 474 RMP 1.18

US 24

WILEY RD

STONE SCHOOL ROAD

WB I-474

EVANS MILL RD-TR 1

EB I-474

MOSSVILLE RD-CH D3

HEINZ ROAD

WB I-74 RP TO GALE

FAU 6653-FOREST HI

ILL 6

US 150

RAMP B-3

RP 23.58 I-74 WB

US 150

Orange Prairie Roa

HALLOCK HOLLOW RD

SMITHVILLE RD

BLUE RIDGE ROAD

GRAHAM CHAPEL ROAD

MC CULLOUGH

SMITHVILLE RD

MC CULLOUGH ROAD

STREITMATTER RD

BELL SCHOOL ROAD

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