Rock County, WI

325 public highway bridges

Rock County Bridge Snapshot

Rock County, Wisconsin contains 325 public highway bridges in the FHWA National Bridge Inventory. Roughly 36.9% are rated “Good,” 26.8% “Fair,” 3.4% “Poor,” and 3.4% 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 WI 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.

325

Total Bridges

36.9%

Good

3.4%

Poor

3.4%

Structurally Deficient

Condition Distribution

Good

36.9% (120)

Fair

26.8% (87)

Poor

3.4% (11)

SD

3.4% (11)

All Bridges (325)

Sort:

CTH HWY D

Over: BASS CREEK

4.4M N JCT CTH Q, Rock, WI

Built 1998 Load: 30.8 t ADT: 4,218

STH 59

Over: YAHARA RIVER

3.7M E JCT STH 138, Rock, WI

Built 1946 Load: 30.8 t ADT: 2,000

LRD RACINE STREET

Over: SPRING BROOK

2.3M E JCT USH 51, Rock, WI

Built 1968 Load: 32.4 t ADT: 9,900

CTH S

Over: BR TURTLE CREEK

0.9M W JCT CTH J, Rock, WI

Built 1966 Load: 32.4 t ADT: 2,461

IH 43 NB

Over: CNW RR

4.8M N JCT IH 90 TO W, Rock, WI

Built 1975 Load: 32.4 t ADT: 8,700

IH 43 SB

Over: CNW RR

2.1M S JCT STH 140 TO S, Rock, WI

Built 1975 Load: 32.4 t ADT: 8,700

STH 59-STH 213-MAD

Over: ALLEN CREEK

3.1M E JCT STH 213 TO S, Rock, WI

Built 1981 Load: 32.4 t ADT: 5,900

CTH H

Over: BR ROCK RIVER

3.2M N JCT USH 14, Rock, WI

Built 1983 Load: 32.4 t ADT: 1,009

STH 81

Over: TURTLE CREEK

1.2M E JCT USH 51 TO N, Rock, WI

Built 1991 Load: 32.4 t ADT: 12,500

LRD CRANSTON RD

Over: SPRINGBROOK CREEK

CITY OF BELOIT, Rock, WI

Built 2002 Load: 32.4 t ADT: 4,400

LRD TARRANT RD

Over: BLACKHAWK CREEK

1.1M N JCT CTH MM, Rock, WI

Built 1989 Load: 32.4 t ADT: 105

LRD SUMMERVILLE RD

Over: LITTLE TURTLE CREEK

0.2M N JCT CTH J, Rock, WI

Built 1976 Load: 32.4 t ADT: 105

LRD N MILTON RD

Over: OTTER CREEK

3.1M N JCT STH 59 TO W, Rock, WI

Built 1955 Load: 34.0 t ADT: 9,152

STH 11

Over: MARKHAM CREEK

1.9M E JCT CTH H, Rock, WI

Built 1970 Load: 34.0 t ADT: 4,100

LRD E CHURCH ST

Over: ALLEN CREEK

0.1M E JCT STH 59, Rock, WI

Built 1983 Load: 34.0 t ADT: 243

LRD BELOIT-NEWARK

Over: SUGAR RIVER

1.2M E JCT CTH T, Rock, WI

Built 1996 Load: 34.0 t ADT: 192

CTH S, SHOPIERE RO

Over: TURTLE CREEK

1.6M N JCT CTH G, Rock, WI

Built 2008 Load: 34.0 t ADT: 5,900

USH 51-E CENTERWAY

Over: ROCK RIVER

0.5M N JCT STH 11, Rock, WI

Built 1958 Load: 35.6 t ADT: 17,527

USH 51-MAIN ST

Over: SAUNDERS CREEK

0.2M N JCT STH 59, Rock, WI

Built 1960 Load: 35.6 t ADT: 8,000

LRD SHIRLAND AVE

Over: ROCK RIVER

0.2M W JCT IH 43, Rock, WI

Built 1984 Load: 35.6 t ADT: 8,700

LRD TOWN LINE RD

Over: ROCK RIVER

0.1M W JCT USH 51, Rock, WI

Built 1995 Load: 35.6 t ADT: 2,089

LRD COLLEY RD

Over: TURTLE CREEK

0.5M E JCT MILWAUKEE RD, Rock, WI

Built 1983 Load: 37.3 t ADT: 1,281

STH 59

Over: ROCK RIVER

0.6M E JCT IH 90 TO E, Rock, WI

Built 1990 Load: 37.3 t ADT: 10,300

STH 81

Over: RACCOON CREEK

1.7M E JCT CTH K, Rock, WI

Built 1990 Load: 37.3 t ADT: 3,300

LRD WILLOWBROOK RD

Over: SPRING BROOK

0.6M N JCT COLLEY RD, Rock, WI

Built 1989 Load: 37.3 t ADT: 4,000

USH 14-STH 11

Over: BR BLACKHAWK CREEK

3.6M E JCT CTH O, Rock, WI

Built 1982 Load: 38.9 t ADT: 9,600

STH EB STH 11

Over: UNION PACIFIC RR

0.9M E JCT CTH G, Rock, WI

Built 1989 Load: 38.9 t ADT: 9,550

LRD MINERAL POINT

Over: BR STEVENS CREEK

1.0M W JCT CTH H, Rock, WI

Built 1990 Load: 38.9 t ADT: 196

STH 104

Over: ALLEN CREEK

4.8M N JCT CTH C, Rock, WI

Built 1990 Load: 38.9 t ADT: 4,100

LRD ST LAWRENCE RD

Over: RACCOON CREEK

0.7M E JCT CTH H, Rock, WI

Built 1992 Load: 38.9 t ADT: 1,104

LRD SOUTH RIVER RD

Over: ROCK RIVER

0.1M E JCT CTH D, Rock, WI

Built 2004 Load: 38.9 t ADT: 1,100

USH 14

Over: BLACKHAWK CREEK

1.2M E JCT CTH A, Rock, WI

Built 1951 Load: 40.5 t ADT: 11,300

CTH D AFTON RD

Over: MARKHAM CREEK

2.6M W JCT USH 51, Rock, WI

Built 1957 Load: 40.5 t ADT: 2,235

LRD W RACINE ST

Over: ROCK RIVER

0.9M E JCT USH 51, Rock, WI

Built 1949 Load: 40.5 t ADT: 6,600

STH 81

Over: WILLOW CREEK

2.9M E JCT STH 11 TO E, Rock, WI

Built 1976 Load: 40.5 t ADT: 3,500

LRD BELOIT AVE

Over: SPRING BROOK

0.7M S JCT STH 11, Rock, WI

Built 1990 Load: 40.5 t ADT: 7,500

LRD TOWNSEND RD

Over: STEVENS CREEK

3.1M W JCT STH 184, Rock, WI

Built 1990 Load: 40.5 t ADT: 135

STH 104

Over: ALLEN CREEK

0.7M N JCT STH 59 E, Rock, WI

Built 1993 Load: 40.5 t ADT: 3,000

LRD SCHAFFNER RD

Over: BR BASS CREEK

0.8M W JCT CTH H, Rock, WI

Built 1996 Load: 40.5 t ADT: 40

STH 11

Over: STEVENS CREEK

2.1M E JCT CTH B, Rock, WI

Built 1992 Load: 42.1 t ADT: 4,800

USH 51

Over: SOO LINE RR

11.4M N JCT STH 81, Rock, WI

Built 1990 Load: 42.1 t ADT: 17,700

LRD FOOTVILLE-HANO

Over: STEVENS CREEK

0.1M W JCT CTH H, Rock, WI

Built 1990 Load: 43.7 t ADT: 235

USH 51-CENTER AVE

Over: ROCK RIVER

11.5M N JCT STH 81, Rock, WI

Built 1990 Load: 45.4 t ADT: 17,700

CTH B

Over: NORWEGIAN CREEK

1.8M E JCT STH 104, Rock, WI

Built 1974 Load: 47.0 t ADT: 525

LRD NELSON RD

Over: BR SUGAR RIVER

3.8M S JCT STH 81, Rock, WI

Built 1958 Load: 19.4 t ADT: 117

LRD NELSON RD

Over: BR SUGAR RIVER

2.1M S JCT STH 81, Rock, WI

Built 1957 Load: 19.4 t ADT: 117

USH 14

Over: SPRING BROOK

0.4M E JCT CTH A, Rock, WI

Built 1951 Load: 22.7 t ADT: 11,300

LRD ROCKPORT RD

Over: MARKHAM CREEK

0.3M E JCT STH 11, Rock, WI

Built 1989 Load: 24.3 t ADT: 1,757

LRD S FOOTVILLE RD

Over: BR BASS CREEK

1.7M S JCT STH 11, Rock, WI

Built 1982 Load: 24.3 t ADT: 182

LRD N. EVANSVILLE-

Over: ALLEN CREEK

2.3M N JCT CTH C, Rock, WI

Built 1981 Load: 25.9 t ADT: 293

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