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 355

Good

Over: TRIB TO SPRING CRK

0000E,300N, Iroquois, IL

Built 2004 Load: 32.4 t ADT: 50

TR 22B

Good

Over: SPRING CREEK

3 MI N/1 MI E LODA, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 25

TR 87(Ford Co)

Good

Over: Spring Creek

1 mi. E. of Loda, Iroquois, IL

Built 2015 Load: 32.4 t ADT: 150

TR361A

Good

Over: BRH OF FOUNTAIN CRK

3.75W 0.5S WELLINGTN, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 75

TR 228

Good

Over: TRIB FOUNTAIN CREEK

T24N,R12W,2ND PM, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 25

TR 228

Good

Over: UNNAMED TRIB

1.25 MI S. CH 10, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

TR 246

Good

Over: STREAM

3.5W,.5N WELLINGTON, Iroquois, IL

Built 2000 Load: 32.4 t ADT: 50

TR 308

Good

Over: TRIB TO MUD CR

1.5 MI N. WELLINGTON, Iroquois, IL

Built 2004 Load: 32.4 t ADT: 75

TR 246

Good

Over: TRIB FOUNTAIN CREEK

3.5 M W 1/2 M S WELL, Iroquois, IL

Built 2010 Load: 32.4 t ADT: 50

CH 2

Good

Over: IROQUOIS

SEC4,T27N,R13W,2NDPM, Iroquois, IL

Built 1991 Load: 32.4 t ADT: 300

TR 320

Good

Over: MARTINTON DITCH NO 3

5.5 MI SE MARTINTON, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

TR 302

Good

Over: TRIB TO PIKE CREEK

2E 2.75S MARTINTON, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 50

TR 188A

Good

Over: TRIB IROQUOIS RIVER

1.5 MI SE L'ERABLE, Iroquois, IL

Built 1987 Load: 32.4 t ADT: 50

TR 302

Good

Over: MARTINTON DITCH

2M SE MARTINTON, Iroquois, IL

Built 1986 Load: 32.4 t ADT: 50

TR 302

Good

Over: MARTINTON DITCH

1.5 M E 1 S MARTINTO, Iroquois, IL

Built 1993 Load: 32.4 t ADT: 50

TR 202

Good

Over: TRIB TO IROQUOIS RIV

2 E & .5 S L'ERABLE, Iroquois, IL

Built 1998 Load: 32.4 t ADT: 75

TR 224

Good

Over: PIKE CREEK

2.75 W MARTINTON, Iroquois, IL

Built 2011 Load: 32.4 t ADT: 100

TR 302

Good

Over: MARTINTON DITCH #2

1.3M E 1.5M N MARTIN, Iroquois, IL

Built 2009 Load: 32.4 t ADT: 50

TR 55B

Good

Over: MARTINTON DITCH NO3

1.25 MI E MARTINTON, Iroquois, IL

Built 2013 Load: 32.4 t ADT: 125

TR 290

Good

Over: TRIB IROQOIS RIVER

4.4 MI S US 52, Iroquois, IL

Built 2003 Load: 32.4 t ADT: 900

TR-290

Good

Over: Iroquois River

2.5 mi.N. of Watseka, Iroquois, IL

Built 2018 Load: 32.4 t ADT: 1,100

TR 325

Good

Over: GAY CREEK

0.75 MI W CH 20, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 50

TR 275A

Good

Over: SUGAR CREEK

1.5N,1.5W OF MILFORD, Iroquois, IL

Built 1983 Load: 32.4 t ADT: 75

TR 256

Good

Over: GAY CREEK

3.5S 2.0W OF MILFORD, Iroquois, IL

Built 1984 Load: 32.4 t ADT: 10

TR 284

Good

Over: TRIB TO MUD CREEK

.5 W, 1.5 S MILFORD, Iroquois, IL

Built 1997 Load: 32.4 t ADT: 100

TR 284 (OLD RT 1)

Good

Over: BR OF LITTLE MUD CR

2.75 MI SW OF ILL 1, Iroquois, IL

Built 2006 Load: 32.4 t ADT: 50

TR 228

Good

Over: FOUNTAIN CREEK

3.75M W 3.25M S MILF, Iroquois, IL

Built 2012 Load: 32.4 t ADT: 25

FAS 1322 (CH 37)

Good

Over: W BR. OF HORSE CRK

1.7 MI W CH8 ON CH37, Iroquois, IL

Built 2010 Load: 32.4 t ADT: 475

TR-11

Good

Over: Creek

4.75 W, 3 N CLIFTON, Iroquois, IL

Built 1989 Load: 32.4 t ADT: 50

TR-30

Good

Over: Stream

5.75MI N.CH4, Iroquois, IL

Built 1994 Load: 32.4 t ADT: 50

TR 22

Good

Over: W BRANCH LANGAN CK

05 MI N OF CH 4, Iroquois, IL

Built 2000 Load: 32.4 t ADT: 25

TR 10A

Good

Over: STREAM

1.5 MI S CH 4, Iroquois, IL

Built 1999 Load: 32.4 t ADT: 25

TR15

Good

Over: TRIB TO LANGAN CREEK

7.25 MI W OF CLIFTON, Iroquois, IL

Built 2005 Load: 32.4 t ADT: 25

TR 41

Good

Over: DRAINAGE DITCH

8M W& .5 M S Clifton, Iroquois, IL

Built 2012 Load: 32.4 t ADT: 25

TR 2

Good

Over: STREAM

FORD-IROQ CO LINE, Iroquois, IL

Built 2020 Load: 32.4 t ADT: 25

TR 40

Good

Over: STREAM

3MI S 1 W ONARGA, Iroquois, IL

Built 1977 Load: 32.4 t ADT: 50

TR142

Good

Over: SHAVETAIL CR

6 MI E 1 NONARGA, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 75

TR 90

Good

Over: TRIB TO SPRING CREEK

3MI E 1 MIS ONARGA, Iroquois, IL

Built 1981 Load: 32.4 t ADT: 25

FAS 322/CH 3

Good

Over: TRIB BEAVER RIVER

.50 MI W PAPINEAU, Iroquois, IL

Built 2001 Load: 32.4 t ADT: 425

TR 250

Good

Over: BEAVER CR

2.25 MI NWPAPINEAU, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 50

TR-234

Good

Over: Beaver Creek

2 M W & .25 N OF RT1, Iroquois, IL

Built 1995 Load: 32.4 t ADT: 75

TR 212

Good

Over: Trib to Iroquois Riv

3/4 M S 4 M W Papine, Iroquois, IL

Built 2012 Load: 32.4 t ADT: 50

FAS 335 CH 10

Good

Over: DRAINAGE DITCH

4.2 MI W RTE 49, Iroquois, IL

Built 1978 Load: 32.4 t ADT: 375

FAS 335 CH 10

Good

Over: DRAINAGE DITCH

4MI.SW CISSNA PARK, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 350

CH 46 (OR 76A)

Good

Over: UNNAMED TRIBUTARY

4.5 MI W 4.25 MI S, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 100

CH 46 (OR 76A)

Good

Over: UNNAMED TRIBUTARY

4.5 MI W 4.75M S CP, Iroquois, IL

Built 2008 Load: 32.4 t ADT: 100

TR 363

Good

Over: TRIB TO PIGEON CR

2 MI W ILLRT 49, Iroquois, IL

Built 1979 Load: 32.4 t ADT: 50

TR 363

Good

Over: TRIB TO PIGEON CREEK

4.0W 3.55 CISNA PARK, Iroquois, IL

Built 1985 Load: 32.4 t ADT: 50

TR 371

Good

Over: PIGEON CR

.5M E ILL 49, Iroquois, IL

Built 1988 Load: 32.4 t ADT: 75

TR 337

Good

Over: TRIB TO L MUD CREEK

3 MI W CISNA PARK, Iroquois, IL

Built 1984 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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial