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)

FAS 334 (CH 9)

Good

Over: TRIB. TO LOUIS CREEK

0.5 MI W BUCKLEY, Iroquois, IL

Built 2001 Load: 37.6 t ADT: 1,050

TR 353

Good

Over: FOUNTAIN CR

1 MI E OF CH 6, Iroquois, IL

Built 1994 Load: 37.6 t ADT: 25

FAS 1324/OLD US 45

Good

Over: TRIB OF LANGAN CREEK

1.2 MI S OF CHEBANSE, Iroquois, IL

Built 1987 Load: 37.9 t ADT: 1,900

FAS 323 ONARGA RD

Good

Over: SPRING CREEK

5.62 MI W OF ILL 49, Iroquois, IL

Built 1989 Load: 37.9 t ADT: 450

TR 251

Good

Over: SUGAR CREEK

2 MI S OF WOODLAND, Iroquois, IL

Built 1987 Load: 37.9 t ADT: 200

FAS 1322 CH37

Good

Over: TR1 B OF TRAIL CR

0.34 MI E US 52, Iroquois, IL

Built 1932 Load: 38.2 t ADT: 575

US 52

Good

Over: DRAINAGE DITCH

0.43 M N US 24, Iroquois, IL

Built 1994 Load: 38.2 t ADT: 1,200

IL 116 (FAP 681)

Good

Over: drainage ditch

2.15 MI W of I-57, Iroquois, IL

Built 2016 Load: 38.2 t ADT: 850

CH 15

Good

Over: Pike Creek

2 mi. S. of Donovan, Iroquois, IL

Built 2014 Load: 38.2 t ADT: 150

ILL 49

Good

Over: BR SHAVETAIL CRK

5.51 MI S JCT 49&24, Iroquois, IL

Built 1996 Load: 38.6 t ADT: 1,000

TR 9A

Good

Over: LITTLE BEAVER CREEK

1.5N 0.5W PAPINEAU, Iroquois, IL

Built 1985 Load: 38.6 t ADT: 100

US 45

Good

Over: LOUIS CREEK

1.68 MI N OF BUCKLEY, Iroquois, IL

Built 2007 Load: 39.2 t ADT: 1,050

US 45

Good

Over: DRAINAGE DITCH

0.39 MI S OF US 24, Iroquois, IL

Built 2004 Load: 39.5 t ADT: 3,000

US 45

Good

Over: Prairie Creek

2.35 M N of US 24, Iroquois, IL

Built 2020 Load: 40.5 t ADT: 1,350

TR 51

Good

Over: BEAVER DITCH NO. 1

5.3 MI E MARTINTON, Iroquois, IL

Built 2023 Load: 40.8 t ADT: 75

TR 5

Good

Over: DRAINAGE DITCH

4.75 W,3.5 N CLIFTON, Iroquois, IL

Built 1987 Load: 40.8 t ADT: 50

TR 68

Good

Over: PRAIRIE CR

3.2MI N GILMAN, Iroquois, IL

Built 1972 Load: 41.1 t ADT: 50

Stockland Road

Good

Over: SUGAR CREEK

9.66 M S OF US 24, Iroquois, IL

Built 1994 Load: 42.8 t ADT: 300

IL 1

Good

Over: Pike Creek

0.15 M N of US 52, Iroquois, IL

Built 2021 Load: 42.8 t ADT: 2,250

US 45/52

Good

Over: Trib to Langan Creek

3.51 M N of US 52, Iroquois, IL

Built 2019 Load: 43.1 t ADT: 3,650

IL 116

Good

Over: LANGAN CREEK

3.97M E FORD C LN, Iroquois, IL

Built 1992 Load: 43.4 t ADT: 850

DANFORTH RD

Good

Over: PRAIRIE CREEK

3.74 M W OF IL 49, Iroquois, IL

Built 1994 Load: 44.1 t ADT: 250

IL 1

Good

Over: Gay Creek

0.16M S ofWellington, Iroquois, IL

Built 2022 Load: 44.4 t ADT: 2,200

TR 2 D

Good

Over: Sheldon Ditch #1

0.9 Mi S of CR1400S, Iroquois, IL

Built 1900 Load: 44.4 t ADT: 75

IL 1

Good

Over: IROQUOIS RIVER

1.0 MI N of US 24, Iroquois, IL

Built 2015 Load: 45.7 t ADT: 2,600

US 52

Good

Over: MARTINTON DR DITCH

3.27 MI E OF ILL 1, Iroquois, IL

Built 1980 Load: 46.0 t ADT: 1,700

IL 1

Good

Over: Gay Creek

3.2 M N of IL 9, Iroquois, IL

Built 2019 Load: 46.7 t ADT: 2,200

TR 121

Good

Over: Garfield Creek

1mi S, .5mi W of Iroquois, Iroquois, IL

Built 2023 Load: 46.7 t ADT: 75

FAS 334 CH-9

Good

Over: SUGAR CREEK

1.42 MI W OF ILL 1, Iroquois, IL

Built 1984 Load: 47.0 t ADT: 1,000

US 45 FAP 681

Good

Over: PRAIRIE CREEK

1.5 mi W/IL 49, Iroquois, IL

Built 2011 Load: 47.3 t ADT: 1,050

CH 42

Good

Over: Trib. to Prairie Creek

1.5miS/1.5miE of Ashkum, Iroquois, IL

Built 2023 Load: 47.6 t ADT: 75

TR 74

Good

Over: SPRING CR

1.5 MI SE ONARGA, Iroquois, IL

Built 2020 Load: 47.6 t ADT: 150

US 45 FAS 338

Good

Over: SPRING CREEK

10.58 MI S OF IL 54, Iroquois, IL

Built 2009 Load: 48.6 t ADT: 1,900

US 45/FAS 317

Good

Over: PRAIRIE CREEK

0.85 MI N OF US 24, Iroquois, IL

Built 2010 Load: 48.6 t ADT: 1,450

IL 1/FAP 332A

Good

Over: COON CREEK

5.35 M S OF US 24, Iroquois, IL

Built 2022 Load: 51.2 t ADT: 2,450

IL 49 FAP 840

Good

Over: PIDGEON CREEK

16.12 MI S OF US 24, Iroquois, IL

Built 2008 Load: 51.5 t ADT: 2,100

IL 54

Good

Over: SPRING CREEK

7.6 M N OF ILL 115, Iroquois, IL

Built 2000 Load: 52.8 t ADT: 1,000

IL 116 FAP 681

Good

Over: BR OF LANGAN CREEK

3.81 MI W OF I-57, Iroquois, IL

Built 2011 Load: 58.6 t ADT: 850

I-57 SB

Good

Over: SPRING CREEK

2.5 MI S BUCKLEY INT, Iroquois, IL

Built 2012 Load: 89.1 t ADT: 8,800

I-57 NB

Good

Over: SPRING CREEK

2.5MI S BUCKLEY INTR, Iroquois, IL

Built 2012 Load: 89.1 t ADT: 8,800

TR 49 B

Poor

Over: PRAIRIE CR

1.5 MI E. L'RABLE, Iroquois, IL

Built 1904 Load: 3.2 t ADT: 25

TR 245

Poor

Over: COON CREEK

.5 MI S WOODLAND, Iroquois, IL

Built 1916 Load: 12.3 t ADT: 25

COLFAX ST

Poor

Over: TRIB OF SPRING CR

2 BLKS S.OF US 24, Iroquois, IL

Built 1900 Load: 13.0 t ADT: 125

TR 10B MFT120

Poor

Over: LOUIS CREEK

3.5MI W BUCKLEY .2 S, Iroquois, IL

Built 1962 Load: 15.6 t ADT: 20

TR 22

Poor

Over: PRAIRIE CR

4MI NW GILMAN, Iroquois, IL

Built 1934 Load: 16.5 t ADT: 25

TR 228

Poor

Over: JEFFERSON CR

1.5 MI S. CH 47, Iroquois, IL

Built 1910 Load: 16.5 t ADT: 25

TR 359

Poor

Over: TRIB TO PIGEON CR

3 MI SE CISSNA PARK, Iroquois, IL

Built 1925 Load: 17.5 t ADT: 75

TR 341

Poor

Over: GAY CREEK

2 MI W. ILL.RTE. 1, Iroquois, IL

Built 1967 Load: 17.5 t ADT: 25

TR 217

Poor

Over: SPRING CR

2 MI E ONARGA, Iroquois, IL

Built 1965 Load: 18.1 t ADT: 75

TR 2E

Poor

Over: STREAM

1 MI W OF AMBIA IND., Iroquois, IL

Built 1914 Load: 18.1 t ADT: 50

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

Related

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