County profile · official public datasets

Kendall County, IL

132 public highway bridges tracked in the FHWA National Bridge Inventory: 52.3% rated Good, 35.6% Fair, 12.1% Poor.

132
Public bridges
52.3%
Good condition
12.1%
Poor condition

The verdict

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

Kendall 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.

82nd
of 102 on Poor share
12.1%
Poor-condition share
132
public highway bridges
1990
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.

Kendall County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Kendall County ranks #82 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 12.1%). Kendall County, Illinois contains 132 public highway bridges. Roughly 52.3% are rated “Good,” 35.6% “Fair,” and 12.1% “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

132

Public highway bridges in Kendall County

Good condition

52.3%

69 of 132 rated 7-9

Fair condition

35.6%

47 of 132 rated 5-6

Poor condition

12.1%

16 of 132 rated 4 or below

In-state Poor-share rank

#82 of 102

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

Condition distribution

Share of 132 NBI-tracked bridges by lowest applicable component rating.

Good
52.3% (69)
Fair
35.6% (47)
Poor
12.1% (16)

Kendall County's Poor-condition bridges carry 10,125 vehicle crossings a day

That is 2.1% of the county's reported daily bridge traffic on 12.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 633 crossings a day against 3,457 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 132 of 132 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

19.7% of Kendall County's bridges have passed the 50-year mark

26 of the 132 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 52.3% 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 15.3% of the county's Poor-condition bridge traffic

CREEK RD over LITTLE ROCK CK, built 1995, carries 1,550 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 16-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 10,125 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Kendall County's bridges were built

132 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 33 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1990, 11 years newer than the Illinois average of 1979.

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

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

The 5 Illinois counties nearest Kendall County in number of bridges, with their condition splits. Its 12.1% Poor share is the 6th-lowest of these 6. Its average build year of 1990 against a peer-group mean of 1982 is 8 years newer.

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

Bridge inventory size and condition shares for Kendall County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Henderson County 142 12%
Perry County 136 7.4%
Massac County 132 8.3%
Monroe County 132 6.8%
Kendall County (this page) 132 12.1%
Johnson County 118 2.5%

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

Similar inventory size

Nearest county inventories outside IL (132 bridges here).

Similar average build year

Nearest mean year-built outside IL (1990 here).

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

All 132 Good 69 Fair 47 Poor 16

All bridges (132)

CHICAGO RD

Good

Over: AUX SABLE CK

1.5 MI W OF GROVERD, Kendall, IL

Built 1995 Load: 40.2 t ADT: 350

MILLINGTON RD

Good

Over: FOX RIVER

CH3 OVER FOX RIVER, Kendall, IL

Built 1958 Load: 41.1 t ADT: 1,550

FERN DELL RD

Good

Over: ROODS CK

0.2 MI E OF LINE RD, Kendall, IL

Built 1981 Load: 41.1 t ADT: 50

US 34

Good

Over: ROB ROY CREEK

2.05 M W of IL 47, Kendall, IL

Built 2019 Load: 41.8 t ADT: 18,700

FAU 4000 ELDAMAIN

Good

Over: FOX RIVER

1 M W YORKVILLE, Kendall, IL

Built 2023 Load: 41.8 t ADT: 500

GROVE RD FAS 1259

Good

Over: AUX SABLE CR BR

SEC 29/30 SEWARD TWP, Kendall, IL

Built 2020 Load: 41.8 t ADT: 600

FOX RIVER DR

Good

Over: CLEAR CREEK

CH1 OVER CLAR CREEK, Kendall, IL

Built 2021 Load: 43.7 t ADT: 1,000

MAIN ST

Good

Over: BIG ROCK CREEK

0.4 Mi. W. of Needham Rd., Kendall, IL

Built 2020 Load: 44.1 t ADT: 700

IL 47

Good

Over: West Aux Sable Creek

0.66 M S of US 52, Kendall, IL

Built 2018 Load: 45.4 t ADT: 5,550

IL 25 FAU 2503

Good

Over: WAUBANSEE CREEK

IL 25 & WAUBANSEE CR, Kendall, IL

Built 2009 Load: 47.6 t ADT: 7,900

US 34

Good

Over: Blackberry Creek

0.51 MI W OF ILL 47, Kendall, IL

Built 2019 Load: 47.6 t ADT: 22,400

FAU 4000 ELDAMAIN

Good

Over: ROB ROY CREEK

1 M NW YORKVILLE, Kendall, IL

Built 2018 Load: 48.0 t ADT: 4,550

T.R. 99VAN DYKE RO

Good

Over: West Aux Sable Creek

75 FT E of VanDyke R, Kendall, IL

Built 2020 Load: 49.6 t ADT: 50

CATON FARM ROAD

Good

Over: Little Slough Creek

CH23 OVR Little Slough Ck, Kendall, IL

Built 2021 Load: 52.2 t ADT: 2,150

C.H. 2 (Grove Road

Good

Over: West Aux Sable Creek

1.5 MI N of US RTE 5, Kendall, IL

Built 2020 Load: 54.4 t ADT: 2,300

Little Rock Road

Good

Over: Trib. little rock cr

2 mi.South Galena RD, Kendall, IL

Built 2018 Load: 80.4 t ADT: 1,900

VAN DYKE RD

Poor

Over: MIDDLE AUXSABLE CK

WEST OF MCANNA, Kendall, IL

Built 1972 Load: 15.6 t ADT: 50

VAN DYKE RD

Poor

Over: E BRANCH AUXSABLE CK

2 MI W OF RIDGE RD, Kendall, IL

Built 1984 Load: 17.2 t ADT: 50

BRISBIN RD/MS0020

Poor

Over: WEST AUX SABLE CK

1 MI N OF ILL RT 52, Kendall, IL

Built 1971 Load: 19.4 t ADT: 225

CHICAGO RD/MS 362

Poor

Over: EAST AUX SABLE CK

BY PETERSON RD, Kendall, IL

Built 1970 Load: 20.4 t ADT: 225

CREEK RD

Poor

Over: LITTLE ROCK CK

0.5MI N-LITTLE RK RD, Kendall, IL

Built 1995 Load: 20.7 t ADT: 1,550

SCHLAPP RD

Poor

Over: EAST AUX-SABLE CR

SCHLAPP & WALKER, Kendall, IL

Built 1967 Load: 21.1 t ADT: 1,000

SCHLAPP RD/MS 360

Poor

Over: E.AUX SABLE CR.

2.5 MI S OF ILL 126, Kendall, IL

Built 1930 Load: 22.4 t ADT: 850

BUDD RD

Poor

Over: HOLLENBACK CREEK

NEAR MILLBROOK, Kendall, IL

Built 1978 Load: 24.0 t ADT: 700

RESERVATION/FAU251

Poor

Over: MORGAN CK

2 MI W OF CH 16, Kendall, IL

Built 1980 Load: 25.3 t ADT: 1,150

SCHAFER RD

Poor

Over: ROB ROY CK

BY ELDAMAIN RD, Kendall, IL

Built 1978 Load: 25.9 t ADT: 1,000

MCKANNA RD/TR 102

Poor

Over: AUX SABLE CK

1.5 MILES N OF US 52, Kendall, IL

Built 1980 Load: 26.6 t ADT: 200

HOLT ROAD

Poor

Over: AUX SABLE CREEK

HOLT RD AUX SABLE, Kendall, IL

Built 1977 Load: 28.2 t ADT: 500

BASELINE RD/MS 199

Poor

Over: ROB ROY CREEK

0.01 MI W OFRT47, Kendall, IL

Built 1966 Load: 28.5 t ADT: 1,350

MILLER RD

Poor

Over: LITTLE ROCK CK

BY CREEK RD, Kendall, IL

Built 1978 Load: 32.4 t ADT: 300

ASHLEY RD

Poor

Over: MIDDLE AUX SABLE

.5 MI N OF WALKER RD, Kendall, IL

Built 2009 Load: 34.0 t ADT: 425

WALKER RD

Poor

Over: MIDDLE AUX SABLE

3.8 MI E OF ILL 47, Kendall, IL

Built 1965 Load: 36.0 t ADT: 550

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.