Iroquois County, IL

565 public highway bridges

Iroquois County Bridge Snapshot

Iroquois County, Illinois contains 565 public highway bridges in the FHWA National Bridge Inventory. Roughly 46% are rated “Good,” 35.8% “Fair,” 13.3% “Poor,” and 13.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IL are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

565

Total Bridges

46%

Good

13.3%

Poor

13.3%

Structurally Deficient

Condition Distribution

Good

46% (260)

Fair

35.8% (202)

Poor

13.3% (75)

SD

13.3% (75)

All Bridges (565)

Sort:

COUNTY HIGHWAY 41

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

Over: LANGAN CREEK

2.3 MI S OF CHEBANSE, Iroquois, IL

Built 1987 Load: 39.9 t ADT: 1,900

US 24

Over: SPRING CREEK

4.1 MILES E OF US 45, Iroquois, IL

Built 1954 Load: 40.5 t ADT: 3,200

US 52

Over: IROQUOIS RIVER

1.73 MI E OF ILL 49, Iroquois, IL

Built 1929 Load: 40.5 t ADT: 1,750

US 24

Over: PRAIRIE CREEK

4.52 MI W OF I-57, Iroquois, IL

Built 1987 Load: 40.5 t ADT: 2,300

TR 172A

Over: SHAVETAIL CR

6 MI S. CRESCENT CIT, Iroquois, IL

Built 1920 Load: 41.1 t ADT: 50

TR 369A

Over: TRIB TO PIGEON CR

1.2MI W IL49, Iroquois, IL

Built 1975 Load: 41.5 t ADT: 50

IL 1/FAP 332A

Over: SUGAR CREEK

S EDGE OF MILFORD, Iroquois, IL

Built 1937 Load: 41.8 t ADT: 2,200

TR 369A

Over: PIGEON CR

1.5MI E CH 46, Iroquois, IL

Built 1975 Load: 41.8 t ADT: 50

BEAVERVILLE RD CH

Over: PIKE CREEK

1.52 MI N OF US 52, Iroquois, IL

Built 1933 Load: 42.8 t ADT: 375

ILL 49

Over: PIGEON CR

4.4 MI N ILL 9, Iroquois, IL

Built 1974 Load: 42.8 t ADT: 1,050

TR 283A

Over: LOUIS CREEK

2N BUCKLEY OFF US45E, Iroquois, IL

Built 1983 Load: 43.4 t ADT: 25

ILL 1

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

Over: BEAVER DITCH

2.40 MI N OF US 52, Iroquois, IL

Built 1933 Load: 44.1 t ADT: 400

TR 250

Over: PIKE CREEK

0.5S,1.5W MARTINTON, Iroquois, IL

Built 1983 Load: 44.1 t ADT: 50

ILL 54

Over: SPRING CREEK

1.12 MI N OF THAWVIL, Iroquois, IL

Built 2004 Load: 44.4 t ADT: 1,000

US 24

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

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

Over: LANGAN CREEK

2.22 MI S FAS 1322, Iroquois, IL

Built 2014 Load: 48.9 t ADT: 9,550

US 24

Over: SUGAR CR

W EDGE OF WATSEKA, Iroquois, IL

Built 1979 Load: 49.6 t ADT: 3,750

IL 1/FAP 332A

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

Over: Dranage Ditch

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

Built 2015 Load: 53.1 t ADT: 18,100

ILL 49

Over: LITTLE MUD CREEK

12.62 M S US 24, Iroquois, IL

Built 1993 Load: 54.1 t ADT: 1,000

ILL 49

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

Over: Prairie Creek

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

Built 2015 Load: 63.5 t ADT: 18,100

I-57 SB

Over: LANGAN CREEK

2.23 MI S CHEBANSE I, Iroquois, IL

Built 2013 Load: 66.1 t ADT: 9,550

U.S. 45

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

Over: SUGAR CREEK TRIB

.71 M N OF CH10, Iroquois, IL

Built 1994 Load: 68.0 t ADT: 2,200

I-57

Over: Dranage Ditch

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

Built 2015 Load: 83.9 t ADT: 18,100

ILL 1

Over: BIG BEAVER CREEK

.76 MI N PAPINEAU RD, Iroquois, IL

Built 1998 Load: 89.1 t ADT: 2,000

FAS 1336 CH 44

Over: DRAINAGE DITCH

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

Built 1941 Load: 21.4 t ADT: 325

CH44 FAS1336

Over: SPRING CREEK

.7MI E US45 ON CH44, Iroquois, IL

Built 1964 Load: 23.0 t ADT: 350

FAS 321 CH 4

Over: IROQUOIS RIVER

3 MI E OF ILL 45, Iroquois, IL

Built 1975 Load: 23.3 t ADT: 425

FAS 316 (CH 23)

Over: LANGAN CR

2 MI N IL 116, Iroquois, IL

Built 1975 Load: 23.7 t ADT: 350

CH 47

Over: SPRING CREEK

.35 MI E OF US 45, Iroquois, IL

Built 1990 Load: 24.0 t ADT: 375

FAS 334 CH 9

Over: TRIB SUGARCREEK

.5N STOCKLAND W 1.75, Iroquois, IL

Built 1975 Load: 24.6 t ADT: 150

FAS 329 CH 10 SA 1

Over: FOUNTAIN CREEK

3.68 MI W OLD ILL 1, Iroquois, IL

Built 2010 Load: 25.9 t ADT: 500

FAS 323

Over: SUGAR CREEK

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

Built 1963 Load: 26.2 t ADT: 775

FAS 323 ONARGA RD

Over: SHAVETAIL CREEK

0.19 MI W OF ILL 49, Iroquois, IL

Built 1989 Load: 26.2 t ADT: 450

TR 308

Over: TRIB. TO MUD CR

1.5 7I SE MILFORD, Iroquois, IL

Built 1956 Load: 26.9 t ADT: 75

TR 309

Over: TRIB TO MUD CR

2 7I. SE MILFORD, Iroquois, IL

Built 1960 Load: 27.5 t ADT: 75

CH 23

Over: TRIB LANGAN CREEK

35MI W CLIFTON, Iroquois, IL

Built 1976 Load: 29.8 t ADT: 350

TR 353

Over: WHISKEY CREEK

2.5E 1.5S CISNA PARK, Iroquois, IL

Built 1984 Load: 30.1 t ADT: 25

TR 178

Over: STREAM

1.25 MI N L'ERABLE, Iroquois, IL

Built 1967 Load: 30.5 t ADT: 175

FAS1335 CH42

Over: TRIB LITTLE MUD CR

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

Built 1963 Load: 30.8 t ADT: 150

TR 422

Over: HOOPER BR

1.5 MI N CH 3, Iroquois, IL

Built 1957 Load: 30.8 t ADT: 25

TR 292

Over: BEAVER CR

.5 MI N PAPINEAU, Iroquois, IL

Built 1973 Load: 31.1 t ADT: 275

TR 361A

Over: GAY CREEK

1 MI W ILL RT 1, Iroquois, IL

Built 1977 Load: 31.8 t ADT: 75

FAS 337

Over: BR OF SPRING CREEK

.41 MILES E FAI 57, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 150

US 45 FAS 317

Over: PRAIRIE CREEK

3.34 MI N OF US 24, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 1,350

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

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026