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)

Sort:

TR 175B SEC 102

Over: PRAIRIE CREEK

.4MI E LAHOGUE, Iroquois, IL

Built 1955 Load: 25.9 t ADT: 75

TR 14

Over: TRIB SPRING CREEK

.2N ILL54 ON CH8, Iroquois, IL

Built 1972 Load: 26.2 t ADT: 300

FAI-57 SB

Over: BRANCH OF SPRING CR

3.1 MI S ONARGA INT, Iroquois, IL

Built 1968 Load: 26.6 t ADT: 8,750

FAI-57 NB

Over: BRANCH OF SPRING CR

3.1 MI S ONARGA INT, Iroquois, IL

Built 1968 Load: 26.6 t ADT: 8,750

FAI 57 NB

Over: SPRING CREEK

2.41 MI S ONARGA INT, Iroquois, IL

Built 1968 Load: 26.9 t ADT: 8,750

TR 27

Over: TRIB LANGAN CREEK

1.5M N 4.5 W CLIFTON, Iroquois, IL

Built 1970 Load: 26.9 t ADT: 50

TR 331A

Over: TRIB MUD CREEK

2.5 MI E OF ILL 1, Iroquois, IL

Built 1960 Load: 26.9 t ADT: 75

FAI-57 SB

Over: SPRING CREEK

2.41 MI S ONARGA INT, Iroquois, IL

Built 1968 Load: 27.2 t ADT: 8,750

TR 180

Over: WHISKEY CREEK

N EDGE CLAYTONVILLE, Iroquois, IL

Built 1968 Load: 27.5 t ADT: 10

TR 275 A

Over: DRAINAGE DITCH

1 MI N .2 W MILFORD, Iroquois, IL

Built 1971 Load: 27.5 t ADT: 75

TR 210

Over: DRAINAGE DITCH

.5 MI N. CH 7, Iroquois, IL

Built 1916 Load: 28.2 t ADT: 75

TR 290

Over: MARTINTON DITCH#2

1 MI NE MARTINTON, Iroquois, IL

Built 1971 Load: 28.2 t ADT: 150

TR 1

Over: STREAM

2.5 MI NW CHENEYVLE, Iroquois, IL

Built 1965 Load: 28.4 t ADT: 50

FAS 329 CH 10 SA 1

Over: GAY CREEK

1.32 MI W OLD ILL 1, Iroquois, IL

Built 1961 Load: 28.8 t ADT: 500

TR 157 SEC 110 TR

Over: SPRING CREEK

1 MI N 45&24 .5 MI E, Iroquois, IL

Built 1961 Load: 28.8 t ADT: 75

TR 353A

Over: STREAM

4 MI W ILL RTE 1, Iroquois, IL

Built 1960 Load: 28.8 t ADT: 25

TR 309

Over: TRIB TO MUD CR

3 MI SE MILFORD, Iroquois, IL

Built 1961 Load: 28.8 t ADT: 75

TR 198

Over: DRAINAGE DITCH

3.5 SE JCT 49&52, Iroquois, IL

Built 1967 Load: 29.2 t ADT: 25

TR 76A

Over: TRIB TO PIGEON CR

.2MI N CH 10 ON CH46, Iroquois, IL

Built 1976 Load: 29.2 t ADT: 50

TR 331

Over: PIGEON CR

1.25 MI E SBI 49, Iroquois, IL

Built 1965 Load: 29.5 t ADT: 50

TR 77

Over: PRAIRIE CR

3 MI E. OF ASHKUM, Iroquois, IL

Built 1970 Load: 29.5 t ADT: 50

TR 31

Over: BEAVER CR

3 MI E BEAVERVILLE, Iroquois, IL

Built 1972 Load: 29.5 t ADT: 75

FAS 335 CH 10

Over: DRAINAGE DITCH

2.5 S 1.6 W CISNA P, Iroquois, IL

Built 1979 Load: 29.5 t ADT: 350

TR 313

Over: SPRING CREEK

4 MI E BUCKLEY, Iroquois, IL

Built 1958 Load: 29.8 t ADT: 25

TR 61

Over: N MARTINTON #2

2.5 SW MARTINTON, Iroquois, IL

Built 1965 Load: 29.8 t ADT: 75

TR 422

Over: BEAVER CR

.5 N CH 3, Iroquois, IL

Built 1957 Load: 30.1 t ADT: 25

TR 95

Over: TRIB. PRAIRIE CR

3 MI NE OF DANFORTH, Iroquois, IL

Built 1973 Load: 30.1 t ADT: 25

TR 363A

Over: GAY CREEK

.8MI W ILL 1, Iroquois, IL

Built 1963 Load: 30.1 t ADT: 125

TR 22B

Over: LOUIS CREEK

1 MI N 1.5 W BUCKLEY, Iroquois, IL

Built 1997 Load: 30.5 t ADT: 25

TR 164

Over: SHAVETAIL CR

0.25 MI N. CH 47, Iroquois, IL

Built 1939 Load: 30.5 t ADT: 25

TR 374

Over: COON CREEK

3.5 MI E. RTE 1, Iroquois, IL

Built 1974 Load: 30.5 t ADT: 25

TR 170

Over: MUD CREEK

2.3 MI N OF CH 10, Iroquois, IL

Built 1976 Load: 30.8 t ADT: 100

TR 442

Over: TRIB TO IROQUOIS RV

2.75 MI S IROQUOIS, Iroquois, IL

Built 1966 Load: 30.8 t ADT: 75

TR 290

Over: MAIN MARTINTON DITCH

1.5 E MARTINTON, Iroquois, IL

Built 1962 Load: 30.8 t ADT: 150

TR 363

Over: WHISKEY CR

2.59 MI E OF ILL 49, Iroquois, IL

Built 1975 Load: 31.4 t ADT: 100

TR 178

Over: PRAIRIE CR

.5 MI N. OF L'ERABLE, Iroquois, IL

Built 1972 Load: 31.8 t ADT: 175

TR 458

Over: BEAVER CR

.5 MI N CH 3, Iroquois, IL

Built 1971 Load: 31.8 t ADT: 25

TR 189

Over: BR OF SPRING CREEK

1.75MI E JCT45&24, Iroquois, IL

Built 1928 Load: 31.8 t ADT: 325

CH 2

Over: TRIB IROQUOIS RIVER

2MI W ILL 1 ON CH 2, Iroquois, IL

Built 1975 Load: 31.8 t ADT: 250

CH 29

Over: LANGAN CR

1.5 MI W 1.5 N CLIFT, Iroquois, IL

Built 1975 Load: 32.1 t ADT: 200

FAI-57 SB

Over: IC RR

8.98 MI S ASHKUM INT, Iroquois, IL

Built 1967 Load: 32.4 t ADT: 9,050

FAI-57 NB

Over: T. P. & W RR

8.78 MI S ASHKUM INT, Iroquois, IL

Built 1967 Load: 32.4 t ADT: 9,050

FAI-57 SB

Over: T.P. & W RR

8.76 MI S ASHKUM INT, Iroquois, IL

Built 1967 Load: 32.4 t ADT: 9,050

US 24

Over: DRAINAGE DITCH

2.1 MILES E OF US 45, Iroquois, IL

Built 1954 Load: 32.4 t ADT: 2,900

FAI-57

Over: STREAM

1.75 MI N OF FORD CO, Iroquois, IL

Built 1971 Load: 32.4 t ADT: 17,600

US 45

Over: CREEK

1.5 M N LODA, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 2,100

FAI-57

Over: LOUIS CREEK

0.89 M.S BUCKLEY INT, Iroquois, IL

Built 2002 Load: 32.4 t ADT: 8,800

TR 269

Over: BR OF SPRING CK

2MI S THAWVILLE, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 25

TR 307

Over: SPRING CREEK

1.2MI E US45 BUCKLEY, Iroquois, IL

Built 1980 Load: 32.4 t ADT: 50

TR 269A

Over: SPRING CREEK

1.5MI S 1MI E DELREY, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

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

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