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:

TR 36

Over: SPRING CREEK

0.75S 0.5E BUCKLEY, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 50

TR 292

Over: DRAINAGE DITCH

3.75 MI NE BUCKLEY, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 25

TR 2B

Over: STREAM

W CO LINE.75S FAS334, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 50

TR 319A

Over: MUD CREEK

0.25 MI E KELLART LK, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 75

TR 200

Over: SHAVETAIL CREEK

T25N R13W 2ND PM, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 50

TR 114

Over: TRIB TO MUD CR

1.5W, 2N CISSNA PK, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 75

TR 57

Over: LANGAN CR

0.29 MI E CH 24, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 58

Over: TRIB OF LANGAN CRK.

.75 MI N. RT. 116, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 25

CH 15

Over: MARTINTON DITCH #3

2MI W .2N DONOVAN, Iroquois, IL

Built 1988 Load: 32.4 t ADT: 50

TR 344

Over: BEAVER CREEK

1.5 MI N BEAVERVILLE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 150

TR 368

Over: BEAVER CREEK

1.25N 1.25E BVILLE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 19

Over: BEAVER CREEK

1.5N,1.75E BEAVERVLL, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 251

Over: TRIB TO COON CREEK

4E 2S OF WOODLAND, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 75

TR 288

Over: COON CREEK

1.5E 1.5 SWOODLAND, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 75

TR 5

Over: N BR LANGAN CR

2.5 MI W CHEBANSE, Iroquois, IL

Built 1939 Load: 32.4 t ADT: 50

TR 140

Over: LANGAN CR

2.32 MI S CHEBANSE, Iroquois, IL

Built 1980 Load: 32.4 t ADT: 200

TR 188

Over: LANGAN CR

3.5 NE LIERABLE, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 58

Over: W BR LANGAN CREEK

0.25S 4W OF CLIFTON, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 25

TR 108

Over: UNNAMED DRAINAGE DT

1 S 1.75 W CHEBANSE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR 120

Over: LANGAN CREEK

2.71 MI. S. CHEBANSE, Iroquois, IL

Built 2002 Load: 32.4 t ADT: 200

TR 91

Over: PIKE CR

0.5 MI W RT 52, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 50

TR 219

Over: STREAM

2.2 MI E ILL 49, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 243

Over: SHAVETAIL CR

.25M E ILL 49, Iroquois, IL

Built 1988 Load: 32.4 t ADT: 50

TR94A

Over: DRAINAGE DITCH

1 MI S 1MIE DANFORTH, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 25

TR 89

Over: BRANCH OF LANGAN CR

2.5N,3.5W DANFORTH, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 50

TR 159

Over: SPRING CREEK

5 MI E 1 MI N GILMAN, Iroquois, IL

Built 2009 Load: 32.4 t ADT: 50

TR 339

Over: TRIB TO PIGEON CR

.6 MI E CISSA PARK, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 150

TR 180

Over: FOUNTAIN CREEK

1 MI S FOUNTAIN CR, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 371

Over: WHISKEY CREEK

2.5E RT 49 1.ON CO L, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 75

CH 35

Over: SPRING CREEK

4 MI NE CRESCENTCITY, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 100

CH 45(N)

Over: IROQUOIS RIVER

SEC 23 T27N R13W 2ND, Iroquois, IL

Built 1995 Load: 32.4 t ADT: 50

TR 137

Over: TRIB TO SPRING CREEK

0.5E 2N CRESCENT CTY, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 50

TR 14A

Over: SPRING CREEK

2.5 MI. N. LODA, Iroquois, IL

Built 1976 Load: 32.4 t ADT: 75

TR 349

Over: SPRING CR

1.5 MI W INT 57, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 75

TR 349

Over: TRIB TO SPRING CREEK

1.25 MI E US RT 45, Iroquois, IL

Built 1980 Load: 32.4 t ADT: 75

TR 2B

Over: STREAM

2.5 MI NW OF LODA, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR186

Over: DRAINAGE DITCH

2MI E RTE 49 &1MIS52, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 50

TR 55B

Over: MARTINTON DITCH NO 3

0.1 MI E MARTINTON, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 150

TR 99B

Over: MIDDLEPORT DITCH TRI

2 MI E ILL 1, Iroquois, IL

Built 2010 Load: 32.4 t ADT: 75

TR 324

Over: TRIB TO SUGAR CK

2 MI SE MILFORD, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 75

TR-301A

Over: Mud Creek

.25S, 2W MILFORD, Iroquois, IL

Built 1990 Load: 32.4 t ADT: 75

TR 333

Over: Gay Creek

3 mi. S. OF Milford, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

TR 27

Over: DRAINAGE DITCH

3 MI S CO LINE, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 5

Over: STREAM

3E,1S NW COR OF CNTY, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR-33

Over: Creek

3000N, 450E, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 25

FAS 1320

Over: BEAVER CR

4 MI W OF PAPINEAU, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 475

TR 204

Over: DRAINAGE DITCH

6.5 MI SW PAPINEAU, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 224

Over: DRAINAGE DITCH

4.5 M SW PAPINEAU, Iroquois, IL

Built 1988 Load: 32.4 t ADT: 100

TR 363

Over: TRIB TO PIGEON CR

1.5 MI W ILL RT 49, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 50

TR 100

Over: UNNAMED TRIB

1 MI. S. CH 44, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

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

Related

Browse all → | Rankings →

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