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 97A

Good

Over: PIKE CREEK

2.5W 1.5N IROQUOIS, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 50

TR 390A

Good

Over: PIKE CREEK

2.5N 1.75W IROQUOIS, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 442

Good

Over: IROQUOIS RIV TRIB

0.5 MI N OF US 24, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 75

TR 348

Good

Over: PIKE CREEK

1.5N, 2W IROQUOIS, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 75

TR-362A

Good

Over: Pike Creek

1.5MI N,CH31, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

TR 163

Good

Over: TRIB TO IROQ. RIVER

1 MI N SHELDON, Iroquois, IL

Built 2002 Load: 32.4 t ADT: 50

TR 438A

Good

Over: BLACKSTON BRANCH

3.25 MI NE OF IROQ., Iroquois, IL

Built 2003 Load: 32.4 t ADT: 25

TR 141

Good

Over: TRIB TO IROQ RIVER

2 MI E US 52, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 50

TR 161

Good

Over: Eastburn Hollow crk

3.5 Mi W&2.5Mi S Iro, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

CH45

Good

Over: STREAM

2.81 MI S US 24, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 50

TR 172

Good

Over: DRAINAGE DITCH

0.6 MI S CRESCENT C1, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 219

Good

Over: SHAVETAIL CREEK

0.5 MI.W.ILL 49, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 150A

Good

Over: SHAVETAIL CREEK

3.0S 1.25W CREST CTY, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 25

TR 216

Good

Over: UNNAMED TRIB

2.6 MI-S,US 24, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 50

TR 184 1600 E

Good

Over: Trib. to Sugar Creek

2 mi. E. of Cresent, Iroquois, IL

Built 2016 Load: 32.4 t ADT: 75

TR 243

Good

Over: DRAINAGE DITCH

1300N, 1410E, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 50

FAS 332

Good

Over: DRAINAGE DITCH

SEC12 T27N R10E 3PM, Iroquois, IL

Built 1996 Load: 32.4 t ADT: 200

CH 42

Good

Over: Prairie Creek

3 mi. E. of Danforth, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

CH 42

Good

Over: Prairie Creek Trib

1.25 mi. N. Danforth, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 75

TR 104

Good

Over: TRIB TO SPRING CREEK

3 MI SE DANFORTH, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 94A

Good

Over: PRAIRIE CREEK

1.4 MI SE DANFORTH, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 25

TR 104

Good

Over: PRAIRIE CRK

2 MI E OF DANFORTH, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 25

TR 95

Good

Over: PRAIRIE CR

5 MI N. OF LEONARD, Iroquois, IL

Built 2005 Load: 32.4 t ADT: 25

FAS 319/CH 8

Good

Over: PRAIRIE CREEK

2.35 MI N.OF US 24, Iroquois, IL

Built 1999 Load: 32.4 t ADT: 350

FAS 319/CH 8

Good

Over: PRAIRIE CREEK

1.5 N OF LAHOGUE, Iroquois, IL

Built 2000 Load: 32.4 t ADT: 350

CH 42

Good

Over: SPRING CREEK

4 M E OF GILMAN, Iroquois, IL

Built 2009 Load: 32.4 t ADT: 75

FAS 319 CH 8

Good

Over: PRAIRIE CREEK

.11 N US24 LAHOGUERD, Iroquois, IL

Built 2010 Load: 32.4 t ADT: 400

CH-42

Good

Over: Trib to Spring Creek

3.5 Miles E Gilman, Iroquois, IL

Built 2015 Load: 32.4 t ADT: 75

TR 10A

Good

Over: PRAIRIE CREEK

1.25S 1W LAHOGUE, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 25

TR 157

Good

Over: TRIB TO SPRING CREEK

2.5E 1.0N OF GILMAN, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 75

TR 551

Good

Over: TRIB TO SPRING CREEK

3E 2N OF GILMAN, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 25

TR 58

Good

Over: PRAIRIE CREEK

2.75 MI W GILMAN, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 25

TR-94A

Good

Over: Creek

1 E ,1N OG GILMAN, Iroquois, IL

Built 1995 Load: 32.4 t ADT: 25

TR 189

Good

Over: SPRING CREEK

5.1MI E JCT45&24, Iroquois, IL

Built 2007 Load: 32.4 t ADT: 125

FAS 331/CH 45

Good

Over: DRAINAGE DITCH

6.4 MI W OF WELLNGTN, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 150

TR 180

Good

Over: FOUNTAIN CREEK

.5MIW 1.5SFOUNTAIN C, Iroquois, IL

Built 1982 Load: 32.4 t ADT: 50

TR 359

Good

Over: FOUNTAIN CREEK

T24N,R13W,2ND PM, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 75

TR 359

Good

Over: WHISKEY CR

4 MI SE CISSNA PARK, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 75

TR 371

Good

Over: Fountain Creek

.1mi W&4.5mi S Clay, Iroquois, IL

Built 2014 Load: 32.4 t ADT: 50

TR 363

Good

Over: FOUNTAIN CREEK

0.17 MI E OF TR 180, Iroquois, IL

Built 2005 Load: 32.4 t ADT: 150

TR 363

Good

Over: FOUNTAIN CREEK

0.06 MI E OF FAS 331, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 100

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB

3.0 MI. E. OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 400

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB.

2.5 MI. EAST OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 400

FAS 335 (CH 10)

Good

Over: PIGEON CREEK TRIB.

3.5 MI E OF LODA, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 375

TR 349

Good

Over: SPRING CREEK

1.25 MI W INT 57, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 75

TR 357

Good

Over: SPRING CR TRIB

1.5E 1.0 N OF LODA, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 25

TR 10 B

Good

Over: STREAM

1 M W, 2 M N LODA, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 20

TR 349

Good

Over: UNNAMED TRIB

2 MI W. INT. 57, Iroquois, IL

Built 1992 Load: 32.4 t ADT: 75

TR 349

Good

Over: UNNAMED TRIB

1.75 M W INT 57, Iroquois, IL

Built 1992 Load: 32.4 t ADT: 75

TR 345

Good

Over: SPRING CREEK

1 MIL W US RTE 45, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 25

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

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