Iroquois County, IL

565 public highway bridges

Iroquois County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Iroquois County, Illinois contains 565 public highway bridges. Roughly 46% are rated “Good,” 35.8% “Fair,” and 13.3% “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.

565
Total Bridges
46%
Good
35.8%
Fair
13.3%
Poor Condition

Condition Distribution

Good
46% (260)
Fair
35.8% (202)
Poor
13.3% (75)

All Bridges (565)

COUNTY HIGHWAY 41

Fair

Over: COON CREEK

6.30 MI S OF US-24, Iroquois, IL

Built 1954 Load: 39.5 t ADT: 350

FAS 1324/OLD US 45

Fair

Over: LANGAN CREEK

2.3 MI S OF CHEBANSE, Iroquois, IL

Built 1987 Load: 39.9 t ADT: 1,900

US 24

Fair

Over: SPRING CREEK

4.1 MILES E OF US 45, Iroquois, IL

Built 1954 Load: 40.5 t ADT: 3,200

US 52

Fair

Over: IROQUOIS RIVER

1.73 MI E OF ILL 49, Iroquois, IL

Built 1929 Load: 40.5 t ADT: 1,750

US 24

Fair

Over: PRAIRIE CREEK

4.52 MI W OF I-57, Iroquois, IL

Built 1987 Load: 40.5 t ADT: 2,300

TR 172A

Fair

Over: SHAVETAIL CR

6 MI S. CRESCENT CIT, Iroquois, IL

Built 1920 Load: 41.1 t ADT: 50

TR 369A

Fair

Over: TRIB TO PIGEON CR

1.2MI W IL49, Iroquois, IL

Built 1975 Load: 41.5 t ADT: 50

IL 1/FAP 332A

Fair

Over: SUGAR CREEK

S EDGE OF MILFORD, Iroquois, IL

Built 1937 Load: 41.8 t ADT: 2,200

TR 369A

Fair

Over: PIGEON CR

1.5MI E CH 46, Iroquois, IL

Built 1975 Load: 41.8 t ADT: 50

BEAVERVILLE RD CH

Fair

Over: PIKE CREEK

1.52 MI N OF US 52, Iroquois, IL

Built 1933 Load: 42.8 t ADT: 375

ILL 49

Fair

Over: PIGEON CR

4.4 MI N ILL 9, Iroquois, IL

Built 1974 Load: 42.8 t ADT: 1,050

TR 283A

Fair

Over: LOUIS CREEK

2N BUCKLEY OFF US45E, Iroquois, IL

Built 1983 Load: 43.4 t ADT: 25

ILL 1

Fair

Over: N MARTINTON DT NO 2

2.20 MI N OF US 52, Iroquois, IL

Built 1955 Load: 44.1 t ADT: 2,250

BEAVERVILLE RD CH

Fair

Over: BEAVER DITCH

2.40 MI N OF US 52, Iroquois, IL

Built 1933 Load: 44.1 t ADT: 400

TR 250

Fair

Over: PIKE CREEK

0.5S,1.5W MARTINTON, Iroquois, IL

Built 1983 Load: 44.1 t ADT: 50

ILL 54

Fair

Over: SPRING CREEK

1.12 MI N OF THAWVIL, Iroquois, IL

Built 2004 Load: 44.4 t ADT: 1,000

US 24

Fair

Over: RAYMOND CREEK

2.65 MI E OF ILL 1, Iroquois, IL

Built 1957 Load: 46.0 t ADT: 3,500

IL 1/FAP 332A

Fair

Over: SUGAR CREEK TRIB

3.18 M N OF CH 10, Iroquois, IL

Built 1994 Load: 48.0 t ADT: 2,200

FAI-57 NB

Fair

Over: LANGAN CREEK

2.22 MI S FAS 1322, Iroquois, IL

Built 2014 Load: 48.9 t ADT: 9,550

US 24

Fair

Over: SUGAR CR

W EDGE OF WATSEKA, Iroquois, IL

Built 1979 Load: 49.6 t ADT: 3,750

IL 1/FAP 332A

Fair

Over: Trib to Sugar Creek

1.85 Mi S of US 24, Iroquois, IL

Built 1953 Load: 50.9 t ADT: 2,300

I-57

Fair

Over: Dranage Ditch

7.15 M. S. of IL 116, Iroquois, IL

Built 2015 Load: 53.1 t ADT: 18,100

ILL 49

Fair

Over: LITTLE MUD CREEK

12.62 M S US 24, Iroquois, IL

Built 1993 Load: 54.1 t ADT: 1,000

ILL 49

Fair

Over: SPRING CREEK

2.47 MI N OF US 24, Iroquois, IL

Built 1961 Load: 55.1 t ADT: 2,300

I-57 NB & SB

Fair

Over: Prairie Creek

4.14 M. S. of IL 116, Iroquois, IL

Built 2015 Load: 63.5 t ADT: 18,100

I-57 SB

Fair

Over: LANGAN CREEK

2.23 MI S CHEBANSE I, Iroquois, IL

Built 2013 Load: 66.1 t ADT: 9,550

U.S. 45

Fair

Over: SPRING CREEK

0.25 M S DEL RAY RD, Iroquois, IL

Built 2002 Load: 66.4 t ADT: 1,050

IL 1/FAP 332A

Fair

Over: SUGAR CREEK TRIB

.71 M N OF CH10, Iroquois, IL

Built 1994 Load: 68.0 t ADT: 2,200

I-57

Fair

Over: Dranage Ditch

5.10 M. S. of IL 116, Iroquois, IL

Built 2015 Load: 83.9 t ADT: 18,100

ILL 1

Fair

Over: BIG BEAVER CREEK

.76 MI N PAPINEAU RD, Iroquois, IL

Built 1998 Load: 89.1 t ADT: 2,000

FAS 1336 CH 44

Good

Over: DRAINAGE DITCH

3 MI E .5M S BUCKLEY, Iroquois, IL

Built 1941 Load: 21.4 t ADT: 325

CH44 FAS1336

Good

Over: SPRING CREEK

.7MI E US45 ON CH44, Iroquois, IL

Built 1964 Load: 23.0 t ADT: 350

FAS 321 CH 4

Good

Over: IROQUOIS RIVER

3 MI E OF ILL 45, Iroquois, IL

Built 1975 Load: 23.3 t ADT: 425

FAS 316 (CH 23)

Good

Over: LANGAN CR

2 MI N IL 116, Iroquois, IL

Built 1975 Load: 23.7 t ADT: 350

CH 47

Good

Over: SPRING CREEK

.35 MI E OF US 45, Iroquois, IL

Built 1990 Load: 24.0 t ADT: 375

FAS 334 CH 9

Good

Over: TRIB SUGARCREEK

.5N STOCKLAND W 1.75, Iroquois, IL

Built 1975 Load: 24.6 t ADT: 150

FAS 329 CH 10 SA 1

Good

Over: FOUNTAIN CREEK

3.68 MI W OLD ILL 1, Iroquois, IL

Built 2010 Load: 25.9 t ADT: 500

FAS 323

Good

Over: SUGAR CREEK

2.7 Mi. E. of Ill. 1, Iroquois, IL

Built 1963 Load: 26.2 t ADT: 775

FAS 323 ONARGA RD

Good

Over: SHAVETAIL CREEK

0.19 MI W OF ILL 49, Iroquois, IL

Built 1989 Load: 26.2 t ADT: 450

TR 308

Good

Over: TRIB. TO MUD CR

1.5 7I SE MILFORD, Iroquois, IL

Built 1956 Load: 26.9 t ADT: 75

TR 309

Good

Over: TRIB TO MUD CR

2 7I. SE MILFORD, Iroquois, IL

Built 1960 Load: 27.5 t ADT: 75

CH 23

Good

Over: TRIB LANGAN CREEK

35MI W CLIFTON, Iroquois, IL

Built 1976 Load: 29.8 t ADT: 350

TR 353

Good

Over: WHISKEY CREEK

2.5E 1.5S CISNA PARK, Iroquois, IL

Built 1984 Load: 30.1 t ADT: 25

TR 178

Good

Over: STREAM

1.25 MI N L'ERABLE, Iroquois, IL

Built 1967 Load: 30.5 t ADT: 175

FAS1335 CH42

Good

Over: TRIB LITTLE MUD CR

1.7MI N JCT CH 42+44, Iroquois, IL

Built 1963 Load: 30.8 t ADT: 150

TR 422

Good

Over: HOOPER BR

1.5 MI N CH 3, Iroquois, IL

Built 1957 Load: 30.8 t ADT: 25

TR 292

Good

Over: BEAVER CR

.5 MI N PAPINEAU, Iroquois, IL

Built 1973 Load: 31.1 t ADT: 275

TR 361A

Good

Over: GAY CREEK

1 MI W ILL RT 1, Iroquois, IL

Built 1977 Load: 31.8 t ADT: 75

FAS 337

Good

Over: BR OF SPRING CREEK

.41 MILES E FAI 57, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 150

US 45 FAS 317

Good

Over: PRAIRIE CREEK

3.34 MI N OF US 24, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 1,350
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge 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.