LaSalle County, IL

529 public highway bridges

LaSalle County Bridge Snapshot

LaSalle County, Illinois contains 529 public highway bridges in the FHWA National Bridge Inventory. Roughly 37.1% are rated “Good,” 39.7% “Fair,” 11.5% “Poor,” and 11.5% 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.

529
Total Bridges
37.1%
Good
11.5%
Poor
11.5%
Structurally Deficient

Condition Distribution

Good
37.1% (196)
Fair
39.7% (210)
Poor
11.5% (61)
SD
11.5% (61)

All Bridges (529)

TR 561

Good

Over: BR.PRAIRIE CR.

N 6TH E 1060, LaSalle, IL

Built 1936 Load: 37.3 t ADT: 25

TR 108

Good

Over: TOMAHAWK CREEK

E 6TH RD N 3510, LaSalle, IL

Built 1987 Load: 37.6 t ADT: 175

ILL 179

Good

Over: MOON CREEK

0.16 MI S OF ILL 17, LaSalle, IL

Built 1984 Load: 37.9 t ADT: 300

FAS 174N/CH 41

Good

Over: BRANCH INDIAN CREEK

E1351, N4742, LaSalle, IL

Built 2002 Load: 37.9 t ADT: 200

ILL 251

Good

Over: BAILEY CREEK

4.0 MI S OF ILL 71, LaSalle, IL

Built 1999 Load: 38.2 t ADT: 1,700

TR 48A

Good

Over: DRAINAGE DITCH

E. 3RD RD N. 1450, LaSalle, IL

Built 1992 Load: 38.2 t ADT: 50

IL 17 FAP 649

Good

Over: SANDY CREEK

2MI E OF WENNONA, LaSalle, IL

Built 1995 Load: 38.6 t ADT: 900

US 52

Good

Over: TOMAHAWK CREEK

6.98 MI E OF ILL 251, LaSalle, IL

Built 1997 Load: 38.6 t ADT: 1,400

IL 71

Good

Over: INTERMIT STREAM

5.90 MI E OF IL 178, LaSalle, IL

Built 2007 Load: 38.9 t ADT: 1,700

TR 314

Good

Over: BUCK CREEK

E 18, N 3450, LaSalle, IL

Built 1998 Load: 38.9 t ADT: 675

TR 101

Good

Over: ROODS CREEK

N4201, E.2710, LaSalle, IL

Built 1992 Load: 39.2 t ADT: 300

SHERIDAN ROAD

Good

Over: MISSION CREEK

0.7 MI N OF US 52, LaSalle, IL

Built 1930 Load: 39.5 t ADT: 1,700

FAS 1274

Good

Over: SOMONAUK CREEK

N 48TH,E 2725, LaSalle, IL

Built 1966 Load: 39.5 t ADT: 3,100

1ST STREET

Good

Over: MENDOTA CREEK

100FT W OF ORCHARD, LaSalle, IL

Built 1997 Load: 39.9 t ADT: 225

IL 170

Good

Over: BNSF Railroad

4.7 M N of IL 17, LaSalle, IL

Built 2019 Load: 40.2 t ADT: 1,400

FAS 270 CH 19

Good

Over: First Creek

N 4250 E 315, LaSalle, IL

Built 2014 Load: 40.2 t ADT: 1,100

IL 71

Good

Over: VERMILION RIVER

3.2 MI W OF IL 178, LaSalle, IL

Built 2006 Load: 40.5 t ADT: 2,200

FAU6121 & I-39 SB

Good

Over: CONVEYOR BELT

.25 MI N OF US 6, LaSalle, IL

Built 1985 Load: 40.5 t ADT: 1,825

TR 469

Good

Over: COVEL CREEK

N 20TH E 2285, LaSalle, IL

Built 2019 Load: 40.5 t ADT: 50

CH 44

Good

Over: PRAIRIE CREEK

2.88 MI S OF ILL 17, LaSalle, IL

Built 1984 Load: 41.1 t ADT: 325

I-80 EB

Good

Over: LITTLE VERMILLION RV

2.1 MI E JCT IL 251, LaSalle, IL

Built 1996 Load: 41.5 t ADT: 14,200

US 51,I-39

Good

Over: STREAM

4.61 MI N OF ILL 18, LaSalle, IL

Built 1988 Load: 41.5 t ADT: 19,400

TR 452

Good

Over: MISSION CREEK

E. 2750 N. 3975, LaSalle, IL

Built 2018 Load: 41.5 t ADT: 50

IL 178

Good

Over: I & M CANAL

1.47 M S of US 6, LaSalle, IL

Built 2012 Load: 41.8 t ADT: 3,600

US 52

Good

Over: Mission Creek

2.12 M E of IL 71, LaSalle, IL

Built 2017 Load: 41.8 t ADT: 1,600

IL 71 FAP 627

Good

Over: CREEK@HENNEPIN CANYN

3.18 MI. E OF IL 178, LaSalle, IL

Built 2007 Load: 42.1 t ADT: 1,700

ILL 18

Good

Over: DRAINAGE DITCH

3.03 MI E OF ILL 89, LaSalle, IL

Built 1999 Load: 42.1 t ADT: 3,050

TR 382

Good

Over: COVEL CREEK

E. 23rd E. 2285, LaSalle, IL

Built 2019 Load: 42.4 t ADT: 25

TR-107A

Good

Over: SOMONAUK CREEK

N 42ND E 2520, LaSalle, IL

Built 2018 Load: 42.8 t ADT: 850

FAU-6011 (1st Ave.

Good

Over: First Creek

1st ave & 9th St., LaSalle, IL

Built 2018 Load: 42.8 t ADT: 1,100

TR 354A

Good

Over: OTTER CREEK

E 21ST N 1440, LaSalle, IL

Built 1926 Load: 43.1 t ADT: 50

US 6

Good

Over: MILLIKEN CR

1.73 MI E OF ILL 71, LaSalle, IL

Built 2016 Load: 43.4 t ADT: 4,050

TR 169

Good

Over: LITTLE VERMILLION

N 3850TH E 545, LaSalle, IL

Built 1985 Load: 44.1 t ADT: 125

PEORIA & OTTAWA RD

Good

Over: BAILEY CR

0.11 mi W IL251, LaSalle, IL

Built 1940 Load: 44.4 t ADT: 325

CO RD 13

Good

Over: LITTLE VERMILION RV

E 5TH,N 3675, LaSalle, IL

Built 1938 Load: 45.0 t ADT: 425

I-80 WB

Good

Over: LITTLE VERMILLION RV

2.1MI E IL251 JCT, LaSalle, IL

Built 1996 Load: 45.7 t ADT: 14,200

IL 170 FAP 786

Good

Over: Waupecan Creek

8.43 mi S of US 6, LaSalle, IL

Built 2014 Load: 45.7 t ADT: 1,200

US 34 FAP 587

Good

Over: VERMILLION CREEK

0.29 E OF US51/I39, LaSalle, IL

Built 1977 Load: 46.0 t ADT: 1,850

US 34 FAP 587

Good

Over: STREAM

4.8 MI W OF I-39, LaSalle, IL

Built 2009 Load: 46.0 t ADT: 1,900

TR 142B

Good

Over: LONG POINT CR

E 8TH N 250, LaSalle, IL

Built 1932 Load: 46.0 t ADT: 25

ILL 351 FAP 619

Good

Over: I & M CANAL Buzzi RR

0.20 MI S OF US 6, LaSalle, IL

Built 1953 Load: 46.7 t ADT: 5,250

ILL 178

Good

Over: ILLINOIS RIVER

2.2 MI S OF US 6, LaSalle, IL

Built 2020 Load: 47.0 t ADT: 3,200

US 6

Good

Over: TRIB OF I & M CANAL

6.47 MI E OF ILL 71, LaSalle, IL

Built 1980 Load: 47.3 t ADT: 2,450

CH 33 FAS 1365

Good

Over: LITTLE VERMILION

N 33RD,E 415, LaSalle, IL

Built 2010 Load: 48.0 t ADT: 525

US 34 FAP 587

Good

Over: LITTLE VERMILION

2.2 MI E OF IL 251, LaSalle, IL

Built 2018 Load: 48.3 t ADT: 5,250

TR 214

Good

Over: EGG BAG CR

E 12TH N 1430, LaSalle, IL

Built 1956 Load: 48.9 t ADT: 125

US 52

Good

Over: TOMAHAWK CREEK

5.84 MI E ILL 251, LaSalle, IL

Built 1997 Load: 49.2 t ADT: 1,500

FAS2258, CH21

Good

Over: FOX RIVER

E 2153,N 3440, LaSalle, IL

Built 1960 Load: 51.8 t ADT: 800

US 51,I-39

Good

Over: STREAM

4.01 MI N OF ILL 18, LaSalle, IL

Built 1988 Load: 52.2 t ADT: 19,400

US 34 FAP 587

Good

Over: SUTPHENS RUN

8.3 MI E OF I-39, LaSalle, IL

Built 2023 Load: 53.1 t ADT: 1,600

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