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:

ROCKTON RD

Over: RACCOON CREEK

2 MI W OF ROCKTON, Winnebago, IL

Built 1989 Load: 35.6 t ADT: 2,250

FRITZ RD

Over: UNNAMED CREEK

1 MI E RT 70, Winnebago, IL

Built 1962 Load: 35.6 t ADT: 550

ILL 251 NB

Over: N KINNIKINNICK CR

0.1 M S HONONEGAH RD, Winnebago, IL

Built 1967 Load: 36.0 t ADT: 27,200

ILL 251 SB

Over: N KINNIKINNICK CR

0.1 M S HONONEGAH RD, Winnebago, IL

Built 1967 Load: 36.0 t ADT: 27,200

IL 70

Over: DRAINAGE DITCH

.1 MI N SUMMERDALE, Winnebago, IL

Built 1962 Load: 36.0 t ADT: 5,000

ILL 251 NB

Over: S KINNIKINNICK CR

0.8 M S HONONEGAH RD, Winnebago, IL

Built 1967 Load: 36.3 t ADT: 27,200

ILL 251 SB

Over: S KINNIKINNICK CR

0.8 M S HONONEGAH RD, Winnebago, IL

Built 1967 Load: 36.3 t ADT: 27,200

I-39 & US 51 SB

Over: KISHWAUKEE RIVER

0.75 MI S BLKHAWK RD, Winnebago, IL

Built 1980 Load: 36.3 t ADT: 14,500

I-39 & US 51 NB

Over: KISHWAUKEE RIVER

0.75 MI S BLKHAWK RD, Winnebago, IL

Built 1981 Load: 36.3 t ADT: 14,500

PERRYVILLE RD

Over: UNION PACIFIC RAILRO

.2 MI N I-39, Winnebago, IL

Built 2016 Load: 36.3 t ADT: 7,450

FARM SCHOOL ROAD

Over: BRANCH OF PINK CREEK

0.2 MI W BEST ROAD, Winnebago, IL

Built 1963 Load: 36.3 t ADT: 50

REED AVE

Over: S.E. DRAINAGEWAY

0.1 MI W OF 11TH ST, Winnebago, IL

Built 1967 Load: 36.3 t ADT: 425

MORGAN ST

Over: ROCK RIVER

0.3 mile E OF IL 2, Winnebago, IL

Built 2013 Load: 36.6 t ADT: 7,600

CENTRAL AVE

Over: N FORK KENT CREEK

0.1 MI N AUBURN ST, Winnebago, IL

Built 1966 Load: 36.9 t ADT: 7,800

BURR OAK ROAD

Over: UNNAMED CREEK

0.5 MI W CROCKETT RD, Winnebago, IL

Built 1971 Load: 36.9 t ADT: 1,400

PERRYVILLE RD

Over: LOVES PARK CREEK

.4 MI N RIVERSIDE BL, Winnebago, IL

Built 1994 Load: 36.9 t ADT: 16,700

US 20 EB

Over: KISHWAUKEE RIVER

.12 MI E OLD MILL RD, Winnebago, IL

Built 1963 Load: 37.3 t ADT: 14,900

US 20 WB

Over: KISHWAUKEE RIVER

.12 MI E OLD MILL RD, Winnebago, IL

Built 1963 Load: 37.3 t ADT: 14,900

ROCKTON RD

Over: ROCKTN DAM MILL RACE

W. EDGE OF ROCKTON, Winnebago, IL

Built 1990 Load: 37.6 t ADT: 2,200

SWANSON RD

Over: UNNAMED STREAM

1.2 MI. E. IL 251, Winnebago, IL

Built 1977 Load: 37.6 t ADT: 3,450

ROCKTON AVE

Over: NW DRAINAGEWAY

0.3 MI S OF HALSTED, Winnebago, IL

Built 1962 Load: 37.9 t ADT: 8,850

HUNTER AVE

Over: KEITH CREEK

.01 MI N OF CHARLES, Winnebago, IL

Built 1987 Load: 37.9 t ADT: 2,150

FRITZ RD

Over: S FORK OTTER CREEK

0.7 MI E RT 70, Winnebago, IL

Built 1962 Load: 38.2 t ADT: 550

ILL 70

Over: KENT CREEK

0.1 M W SPRINGFLD RD, Winnebago, IL

Built 2003 Load: 38.6 t ADT: 4,600

STATE ST

Over: KISHWAUKEE RIVER

IN CHERRY VALLEY, Winnebago, IL

Built 1926 Load: 38.9 t ADT: 4,350

IL 251 (FAP 734)

Over: UP RR

KISHWAUKEE ST-RKFORD, Winnebago, IL

Built 1991 Load: 38.9 t ADT: 15,800

IL 70

Over: PECATONICA RIVER

5 MI S. OF DURAND, Winnebago, IL

Built 1996 Load: 38.9 t ADT: 3,500

ILL 70

Over: TRIB PECATONICA RIV

.4 MI E OF JUDD RD, Winnebago, IL

Built 1982 Load: 38.9 t ADT: 3,000

MONTAGUE RD

Over: ROCK CREEK

0.2 M W MERIDIAN RD, Winnebago, IL

Built 1981 Load: 38.9 t ADT: 3,300

WHITMAN ST

Over: ROCK RIVER

0.03 MI W OF N MAIN, Winnebago, IL

Built 1960 Load: 38.9 t ADT: 19,400

PECATONICA RD

Over: PECATONICA RIVER

N EDGE OF PECATONICA, Winnebago, IL

Built 1985 Load: 39.2 t ADT: 2,700

US 20 W B

Over: IL RR

.5 MI W OF ILL 251, Winnebago, IL

Built 1960 Load: 39.5 t ADT: 32,000

HARRISON ROAD

Over: TUNNISON CREEK

1.9 MI N TRASK BR RD, Winnebago, IL

Built 1992 Load: 39.5 t ADT: 225

MULFORD ROAD

Over: KEITH CREEK

0.5 MI N GUILFORD RD, Winnebago, IL

Built 1961 Load: 39.5 t ADT: 8,700

ALPINE ROAD

Over: WILLOW CREEK

0.8 MI. S IL 173, Winnebago, IL

Built 1989 Load: 39.5 t ADT: 16,100

MOATE ROAD

Over: DRAINAGE DITCH

0.3 MI. N. FRITZ RD., Winnebago, IL

Built 1999 Load: 39.5 t ADT: 25

HARRISON AVE

Over: ROCK RIVER

0.2 MI E OF ILL RT 2, Winnebago, IL

Built 1975 Load: 39.5 t ADT: 10,200

CHESTNUT ST

Over: ROCK RIVER

0.1 MI E OF MAIN ST, Winnebago, IL

Built 1962 Load: 39.5 t ADT: 8,200

ILL 2

Over: DRAINAGE DITCH

1 MI N OF LATHAM RD, Winnebago, IL

Built 1989 Load: 39.9 t ADT: 9,950

ELEVATOR RD

Over: NO KINNIKINNICK CR

0.15 MI. E. ILL 251, Winnebago, IL

Built 1969 Load: 39.9 t ADT: 9,800

I-90 N B

Over: STONEBRIDGE TRAIL

1 MI E OF ROSCOE, Winnebago, IL

Built 1958 Load: 39.9 t ADT: 28,550

ILL 75

Over: PECATONICA RIVER

1.2 MI W MERIDIAN RD, Winnebago, IL

Built 1990 Load: 40.2 t ADT: 2,650

CROWLEY RD

Over: N BR OTTER CREEK

0.5 MI N FRITZ ROAD, Winnebago, IL

Built 1966 Load: 40.2 t ADT: 200

MERIDIAN RD

Over: BR N FK KENT CR

0.2 M N SAFFORD RD, Winnebago, IL

Built 1979 Load: 40.2 t ADT: 3,400

RIVERSIDE BLVD

Over: ROCK RIVER& RR

WEST LOVES PARK, Winnebago, IL

Built 1953 Load: 40.2 t ADT: 17,700

NEWBURG RD

Over: MANNING CREEK

0.2 W OF COUNTY LINE, Winnebago, IL

Built 1974 Load: 41.5 t ADT: 8,000

BELTLINE RD

Over: S CHANNEL ROCK RIV

0.23 MI SOUTH ILL 2, Winnebago, IL

Built 1986 Load: 41.8 t ADT: 10,900

IL 251

Over: KISHWAUKEE RIVER

AT NEW MILLFORD, Winnebago, IL

Built 1996 Load: 41.8 t ADT: 3,300

PELLEY ROAD

Over: FULLER CREEK

0.5 MI W OF RT 2, Winnebago, IL

Built 1962 Load: 41.8 t ADT: 550

ATWOOD ROAD

Over: S.KINNIKINNICK CR

0.2 MI S BURR OAK RD, Winnebago, IL

Built 1973 Load: 41.8 t ADT: 1,500

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