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)

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 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

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 228

Poor

Over: MUD CR

1 MI N. CH 20, Iroquois, IL

Built 1914 Load: 23.0 t ADT: 25

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

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 126

Poor

Over: LITTLE MUD CR

3 MI N CISSNA PK, Iroquois, IL

Built 1970 Load: 29.2 t ADT: 50

US 52

Poor

Over: PIKE CREEK

0.24 MI E OF ILL 1, Iroquois, IL

Built 1928 Load: 29.5 t ADT: 1,700

ILL 1

Poor

Over: LITTLE BEAVER CREEK

1.2 N PAPINEAU RD, Iroquois, IL

Built 1954 Load: 30.5 t ADT: 2,000

US 45-52

Poor

Over: LANGAN CR

5.15 MI N OF US 52-IL 49, Iroquois, IL

Built 1952 Load: 31.1 t ADT: 3,650

TR 345B

Poor

Over: TRIB LITTLE MUD CK

4MI W CISSNA PARK, Iroquois, IL

Built 1920 Load: 31.1 t ADT: 50

FAI-57 NB

Poor

Over: IC RR

8.98 MI S ASHKUM INT, Iroquois, IL

Built 1967 Load: 32.4 t ADT: 9,050

FAS-330 CH31

Poor

Over: IROQUOIS RIVER

1MI N WATSEKA ON 31, Iroquois, IL

Built 1965 Load: 32.4 t ADT: 1,200

TR 94A

Poor

Over: TRIB. TO SPRING CR

2 MI E. 45&24-.25 N, Iroquois, IL

Built 1928 Load: 33.0 t ADT: 25

TR 331A

Poor

Over: STREAM

0.8 MI. E. CH 41, Iroquois, IL

Built 1976 Load: 35.6 t ADT: 75

TR 4

Poor

Over: STREAM

0.3 MI N THAWVILLE, Iroquois, IL

Built 1980 Load: 36.0 t ADT: 50

TR 104

Poor

Over: TRIB PRAIRIE CREEK

2MI E1.5MI N DANFORT, Iroquois, IL

Built 1976 Load: 37.6 t ADT: 75

TR 317

Poor

Over: UNNAMED TRIBUTARY

2.25 M W STOCKLAND, Iroquois, IL

Built 1995 Load: 37.6 t ADT: 50

US 45 & US 52

Poor

Over: PRAIRIE CREEK

1.33 MI N OF US 52-IL 49, Iroquois, IL

Built 1952 Load: 38.9 t ADT: 3,250

FAI-57 SB

Poor

Over: Louis Creek

7.33 M S ONARGA INT, Iroquois, IL

Built 1968 Load: 43.1 t ADT: 8,750

FAI 57 NB

Poor

Over: Louis Creek

7.33 M S ONARGA INT, Iroquois, IL

Built 1968 Load: 43.7 t ADT: 8,750

TR 293

Structurally Deficient

Over: LITTLE MUD CREEK

3MI N 2.75 W CISSNA, Iroquois, IL

Built 1971 ADT: 25

TR 126

Structurally Deficient

Over: MUD CR

0.5 W CISSNA P, Iroquois, IL

Built 1954 ADT: 50

TR 108

Structurally Deficient

Over: LANGAN CREEK

1.5N O.SW OF CLIFTON, Iroquois, IL

Built 1983 ADT: 50

TR 420A

Structurally Deficient

Over: TRIB TO IROQUOIS RV

N. EDGE OF IROQUOIS, Iroquois, IL

Built 1930 ADT: 25

TR 104

Structurally Deficient

Over: TRIB TO SPRING CR

2 MI N US 45&24-2 MI, Iroquois, IL

Built 1956 ADT: 25

TR 192

Structurally Deficient

Over: WHISKEY CR

1 MI NE CLAYTONVILLE, Iroquois, IL

Built 1896 ADT: 25

TR 320

Structurally Deficient

Over: MARTINTON DITCH #3

2.5MI E MARTINTON, Iroquois, IL

Built 1955 ADT: 25

TR 242

Structurally Deficient

Over: MUD CR

5 MI SW MILFORD, Iroquois, IL

Built 1917 ADT: 25

TR 2 D

Structurally Deficient

Over: TRIB TO SUGAR CR

.5 MI N CH 9, Iroquois, IL

Built 1965 ADT: 50

TR-290

Structurally Deficient

Over: Martinton Ditch #3

1MI E MARTINTON, Iroquois, IL

Built 1959 Load: 2.3 t ADT: 175

TR 327

Structurally Deficient

Over: LOUIS CREEK

.5MI S 1W BUCKLEY, Iroquois, IL

Built 1966 Load: 5.5 t ADT: 100

TR 2C

Structurally Deficient

Over: Hooper Branch

2.42 MI S CO LN, Iroquois, IL

Built 1968 Load: 13.0 t ADT: 150

TR 434

Structurally Deficient

Over: SUGAR CR

2.5 MI N. STOCKLAND, Iroquois, IL

Built 1921 Load: 13.6 t ADT: 50

TR 282

Structurally Deficient

Over: TRIB SUGAR CREEK

1.5 MI SE WATSEKA, Iroquois, IL

Built 1910 Load: 14.3 t ADT: 75

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