Winnebago County, IL

475 public highway bridges

Winnebago County Bridge Snapshot

Winnebago County, Illinois contains 475 public highway bridges in the FHWA National Bridge Inventory. Roughly 27.8% are rated “Good,” 49.7% “Fair,” 6.1% “Poor,” and 6.1% 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.

475

Total Bridges

27.8%

Good

6.1%

Poor

6.1%

Structurally Deficient

Condition Distribution

Good

27.8% (132)

Fair

49.7% (236)

Poor

6.1% (29)

SD

6.1% (29)

All Bridges (475)

Sort:

I-39 & US 20 SB

Over: UP RR

1.4 MI S OF I-90, Winnebago, IL

Built 1963 Load: 42.1 t ADT: 25,450

I-39 & US 20 N B

Over: UP RR

1.4 MI S OF I-90, Winnebago, IL

Built 1963 Load: 42.1 t ADT: 25,450

BELTLINE RD

Over: N CHANNEL ROCK RIVER

.04 MI SOUTH IL 2, Winnebago, IL

Built 1986 Load: 42.4 t ADT: 10,900

IL 251 W. FR. RD.

Over: MC DONALD CREEK

2.0 MI. N. OF IL 173, Winnebago, IL

Built 1992 Load: 42.4 t ADT: 1,350

CENTER RD

Over: N. BR. OTTER CREEK

0.5 MI N NORTH ST, Winnebago, IL

Built 1990 Load: 42.4 t ADT: 700

ALPINE RD

Over: CN RAILROAD

0.5 MI S HARRISON AV, Winnebago, IL

Built 1963 Load: 42.8 t ADT: 21,200

SCHOOL ST

Over: KENT CREEK

0.2 MI W OF KILBURN, Winnebago, IL

Built 1969 Load: 42.8 t ADT: 6,200

ILL 2

Over: FULLERS CREEK

0.6 MI SOUTH US 20, Winnebago, IL

Built 2011 Load: 43.4 t ADT: 15,500

ILL 251 & FR RDS

Over: WILLOW CREEK

1 MI S JCT ILL 173, Winnebago, IL

Built 1964 Load: 43.4 t ADT: 17,300

MCMICHAEL ROAD

Over: MCDONALD CREEK

0.4 M E BELVIDERE RD, Winnebago, IL

Built 1982 Load: 43.4 t ADT: 300

BELTLINE RD

Over: KISHWAUKEE CK

1.3 MI W OF ILL 251, Winnebago, IL

Built 2010 Load: 44.1 t ADT: 1,650

SWANSON RD

Over: MCDONALD CREEK

0.6 MI E RT 251, Winnebago, IL

Built 1977 Load: 44.1 t ADT: 5,000

MERRILL AVE

Over: LOVES PARK CREEK

CENTER LOVES PARK, Winnebago, IL

Built 1964 Load: 44.1 t ADT: 275

I 90 EB

Over: KISHWAUKEE RIVER

.5 MI N CHERY VALY, Winnebago, IL

Built 2013 Load: 44.1 t ADT: 25,300

IL 251

Over: LOVES PARK CREEK

S OF RIVER LN-LV PK, Winnebago, IL

Built 1995 Load: 44.4 t ADT: 16,300

OLD RIVER RD

Over: UNNAMED CREEK

.5 MI N OF ROSCOE RD, Winnebago, IL

Built 1967 Load: 44.4 t ADT: 2,900

I 90 WB

Over: KISHWAUKEE RIVER

.85 MI E OF I 39, Winnebago, IL

Built 2013 Load: 44.4 t ADT: 25,300

PATTERSON ROAD

Over: UNNAMED CREEK

0.3 MI N OF RT 75, Winnebago, IL

Built 1976 Load: 44.7 t ADT: 275

FAU 5063 - STATE S

Over: ROCK RIVER

DOWNTOWN ROCKFORD, Winnebago, IL

Built 1948 Load: 45.0 t ADT: 6,000

IL 251 SB

Over: KILBUCK CREEK

.6 MI N. OGLE CO.LN., Winnebago, IL

Built 1989 Load: 45.0 t ADT: 4,450

IL 2

Over: DRAINAGE DITCH

0.6 MI NE OGLE CO LN, Winnebago, IL

Built 1994 Load: 45.0 t ADT: 6,200

US 20 EB

Over: GROVE CREEK

.3MI E STEPHENSON CO, Winnebago, IL

Built 1995 Load: 45.4 t ADT: 13,000

ILL 251 SB

Over: MCDONALD CREEK

2.0 MI N ILL 173, Winnebago, IL

Built 2002 Load: 45.4 t ADT: 24,200

ILL 251 NB

Over: MCDONALD CREEK

2.0 MI N ILL 173, Winnebago, IL

Built 2002 Load: 45.4 t ADT: 24,200

US 20 WB

Over: GROVE CREEK

0.3 MI E STEPH. CO., Winnebago, IL

Built 1994 Load: 45.7 t ADT: 13,000

ROCKTON RD

Over: ROCK RIVER OVERFLOW

.3 MI W OF ROCKTON, Winnebago, IL

Built 1989 Load: 45.7 t ADT: 2,200

ALPINE RD

Over: UNION PACIFIC RR

0.4 MI S HARRISON AV, Winnebago, IL

Built 1963 Load: 46.0 t ADT: 21,200

IL 2 SB

Over: MUD CREEK

0.4 MI S OLD RVR RD, Winnebago, IL

Built 2012 Load: 46.3 t ADT: 11,800

TRASK BRIDGE RD

Over: UNNAMED CREEK

0.2 MI E COUNTY LINE, Winnebago, IL

Built 1983 Load: 46.3 t ADT: 850

BELT LINE RD

Over: IL RR

0.8 MI W OF ILL 251, Winnebago, IL

Built 2010 Load: 47.6 t ADT: 1,650

IL 2 NB

Over: MUD CREEK

0.4 MI S OLD RIVR RD, Winnebago, IL

Built 2012 Load: 47.6 t ADT: 11,800

COMLY ROAD

Over: COOLIDGE CREEK

0.1 MI W KEITH ROAD, Winnebago, IL

Built 1970 Load: 47.6 t ADT: 200

HONONEGAH RD

Over: DRY CREEK

1.3 MI. W. OF IL 251, Winnebago, IL

Built 1991 Load: 47.6 t ADT: 11,400

I-39 & US 20 N B

Over: CN RR

4.7 MI E OF IL 251, Winnebago, IL

Built 1963 Load: 48.3 t ADT: 25,450

I-39 & US 20 SB

Over: CN RR

4.7 MI E OF IL 251, Winnebago, IL

Built 1963 Load: 48.3 t ADT: 25,450

US 20 E B

Over: W CHANNEL ROCK RIV

.5 MI E OF IL 2, Winnebago, IL

Built 2014 Load: 48.3 t ADT: 32,000

9TH STREET

Over: KEITH CREEK

0.5 M N OF BROADWAY, Winnebago, IL

Built 1984 Load: 48.6 t ADT: 2,100

6TH ST

Over: KEITH CREEK

0.5 MI S OF E STATE, Winnebago, IL

Built 1984 Load: 49.9 t ADT: 3,900

PECATONICA RD

Over: PINK CREEK

.40MI S TRASK BRIDGE, Winnebago, IL

Built 2000 Load: 50.9 t ADT: 1,500

US 20

Over: FULLERS CREEK

.5 MI W OF ILL 2, Winnebago, IL

Built 1964 Load: 51.2 t ADT: 20,400

FAI 90 NB

Over: DRY CREEK

1.0 MI SOUTH RT 75, Winnebago, IL

Built 2012 Load: 52.2 t ADT: 25,500

US 20 E B

Over: E CHANNEL ROCK RIV

.7 MI E OF ILL 2, Winnebago, IL

Built 2014 Load: 53.5 t ADT: 32,000

KISHWAUKEE RD

Over: CANAL CREEK

0.8 MI NE CONDON RD, Winnebago, IL

Built 1979 Load: 54.1 t ADT: 4,550

PERRYVILLE RD

Over: SPRING CREEK

0.4 MI N SPRING BRK, Winnebago, IL

Built 1994 Load: 54.1 t ADT: 21,200

CROCKETT ROAD

Over: UNNAMED CREEK

0.5 MI N BURR OAK RD, Winnebago, IL

Built 1968 Load: 54.8 t ADT: 950

FAI 90 S B

Over: DRY CREEK

1.0 MI SOUTH RT 75, Winnebago, IL

Built 2012 Load: 59.3 t ADT: 25,500

HARRISON ROAD

Over: STREAM

.9 MI N OF ILL 75, Winnebago, IL

Built 1973 Load: 59.6 t ADT: 350

SPRINGFIELD AVE

Over: S BR KENT CREEK

700 FT.S CUNNINGHAM, Winnebago, IL

Built 2002 Load: 61.6 t ADT: 7,700

US 20 W B

Over: CN RR

1.2 MI E MERIDIAN RD, Winnebago, IL

Built 1964 Load: 61.9 t ADT: 14,600

US 20 E B

Over: CN RR

1.2 MI E MERIDIAN RD, Winnebago, IL

Built 1964 Load: 62.2 t ADT: 14,600

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026