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)

TR 49 B

Poor

Over: PRAIRIE CR

1.5 MI E. L'RABLE, Iroquois, IL

Built 1904 Load: 3.2 t ADT: 25

TR 327

Poor

Over: LOUIS CREEK

.5MI S 1W BUCKLEY, Iroquois, IL

Built 1966 Load: 5.5 t ADT: 100

TR 245

Poor

Over: COON CREEK

.5 MI S WOODLAND, Iroquois, IL

Built 1916 Load: 12.3 t ADT: 25

TR 2C

Poor

Over: Hooper Branch

2.42 MI S CO LN, Iroquois, IL

Built 1968 Load: 13.0 t ADT: 150

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 434

Poor

Over: SUGAR CR

2.5 MI N. STOCKLAND, Iroquois, IL

Built 1921 Load: 13.6 t ADT: 50

TR 282

Poor

Over: TRIB SUGAR CREEK

1.5 MI SE WATSEKA, Iroquois, IL

Built 1910 Load: 14.3 t ADT: 75

TR 91 B

Poor

Over: PIKE CREEK

2.8 MI. E. ILL 1, Iroquois, IL

Built 1958 Load: 15.2 t ADT: 200

TR 10B MFT120

Poor

Over: LOUIS CREEK

3.5MI W BUCKLEY .2 S, Iroquois, IL

Built 1962 Load: 15.6 t ADT: 20

TR 140

Poor

Over: TRIB PRAIRE CR

.8 MI S OF FAS 321, Iroquois, IL

Built 1962 Load: 16.5 t ADT: 75

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 89

Poor

Over: PRAIRIE CR

1.7M W ILL49, Iroquois, IL

Built 1976 Load: 17.2 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

TR 84

Poor

Over: BR OF SPRING CREEK

1.5 E .25 N JCT45&24, Iroquois, IL

Built 1953 Load: 18.5 t ADT: 75

FAS1335CH42

Poor

Over: TRIB LITTLE MUD CR

3MI NW CISSNA PARK, Iroquois, IL

Built 1918 Load: 19.4 t ADT: 150

TR 327 MFT108TR

Poor

Over: LOUIS CREEK

.5MI S .3W BUCKLEY, Iroquois, IL

Built 1960 Load: 19.8 t ADT: 100

TR 135

Poor

Over: PRAIRE CREEK

2.0M NW GILMAN, Iroquois, IL

Built 1924 Load: 19.8 t ADT: 25

TR 565

Poor

Over: SPRING CR

.7M E US45, Iroquois, IL

Built 1915 Load: 20.4 t ADT: 50

TR 396

Poor

Over: TRIB TO SUGAR CR

.25 MI W STOCKLAND, Iroquois, IL

Built 1907 Load: 20.4 t ADT: 50

TR 339

Poor

Over: PIGEON CR

.5 MI E. CISSA PARK, Iroquois, IL

Built 1967 Load: 20.7 t ADT: 150

TR 284 (OLD RT 1)

Poor

Over: BR SUGAR CREEK

5.01 M SW OF ILL 1, Iroquois, IL

Built 1930 Load: 21.1 t ADT: 50

TR 55B

Poor

Over: MARTINTON DCH NO 3

3 MI E MARTINTON, Iroquois, IL

Built 1927 Load: 21.1 t ADT: 125

TR 22B

Poor

Over: LOUIS CREEK

.8MI S CH9 1MIW US45, Iroquois, IL

Built 1964 Load: 22.0 t ADT: 25

TR97

Poor

Over: DRAINAGE DITCH

1.25 MI W ILL 1, Iroquois, IL

Built 1987 Load: 22.0 t ADT: 25

TR 30

Poor

Over: W. BR LANGAN CR

0.25 MI N. CH 4, Iroquois, IL

Built 1965 Load: 22.4 t ADT: 50

TR 16

Poor

Over: STREAM

2.10 MI S. CO. LINE, Iroquois, IL

Built 1964 Load: 22.7 t ADT: 25

TR 228

Poor

Over: MUD CR

1 MI N. CH 20, Iroquois, IL

Built 1914 Load: 23.0 t ADT: 25

TR 2

Poor

Over: STREAM

TR 2 DN SEC 113, Iroquois, IL

Built 1959 Load: 23.7 t ADT: 50

TR-290

Poor

Over: Pike Creek

2.25MI S MARTINTON, Iroquois, IL

Built 1965 Load: 23.7 t ADT: 825

TR 26A MFT 110 TR

Poor

Over: LOUIS CREEK

1MI N BUCKLEY, Iroquois, IL

Built 1916 Load: 24.0 t ADT: 75

TR 285

Poor

Over: TRIB TO SUGAR CREEK

1.5N 1E OF STOCKLAND, Iroquois, IL

Built 1983 Load: 24.0 t ADT: 75

TR 276

Poor

Over: COON CREEK

1.5 SE WOODLAND, Iroquois, IL

Built 1916 Load: 24.9 t ADT: 25

TR 44A

Poor

Over: TRIB LANGAN CREEK

5MI W CLIFTON N .25, Iroquois, IL

Built 1956 Load: 24.9 t ADT: 50

TR 351

Poor

Over: TRIB TO PIGEON CR

2.2 MI W. ILL RT 49, Iroquois, IL

Built 1961 Load: 24.9 t ADT: 25

TR 352

Poor

Over: TRIB MUD CR

2MIW.5MIS GREER, Iroquois, IL

Built 1967 Load: 25.9 t ADT: 50

FAS 323 CH 40

Poor

Over: POSSUM TROT DITCH

3.5M S SHELDON 1.1 W, Iroquois, IL

Built 1938 Load: 26.2 t ADT: 300

ILL 49

Poor

Over: SHAVETAIL CREEK

4.83 MI S OF US 24, Iroquois, IL

Built 1927 Load: 26.6 t ADT: 1,000

FAI-57 SB

Poor

Over: PRAIRIE CREEK

6.18 MI S OF ILL 116, Iroquois, IL

Built 1967 Load: 26.9 t ADT: 9,050

FAS 1343 CH 41

Poor

Over: BRANCH SUGAR CREEK

1.6 MI S STOCKLAND, Iroquois, IL

Built 1959 Load: 26.9 t ADT: 175

TR 1

Poor

Over: TRIB TO PIGEON CR

0.5 MI E 49 ON CO LN, Iroquois, IL

Built 1981 Load: 26.9 t ADT: 50

FAI-57 NB

Poor

Over: PRAIRIE CR

6.16 MI S OF ILL 116, Iroquois, IL

Built 1967 Load: 27.9 t ADT: 9,050

TR 280

Poor

Over: TRIB. TO MUD CR

1.5 MI SW MILFORD, Iroquois, IL

Built 1971 Load: 27.9 t ADT: 75

TR 452

Poor

Over: STREAM

2.5 MI S. 5 E EFFNER, Iroquois, IL

Built 1977 Load: 27.9 t ADT: 25

TR 126

Poor

Over: LITTLE MUD CR

3 MI N CISSNA PK, Iroquois, IL

Built 1970 Load: 29.2 t ADT: 50

TR 442

Poor

Over: TRIB TO IROQUOIS RV

2.5 MI SE OF IROQUOI, Iroquois, IL

Built 1952 Load: 29.2 t ADT: 75

US 52

Poor

Over: PIKE CREEK

0.24 MI E OF ILL 1, Iroquois, IL

Built 1928 Load: 29.5 t ADT: 1,700

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

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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.