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:

IH 43 SB

Over: IH 39 / IH 90 / STH 81

IH 43 / IH 39 / IH 90 INT, Rock, WI

Built 2021 ADT: 55,500

IH 39 SB TO IH 43

Over: IH 39 NB & SB / IH 90 WB

IH 43 / IH 39 / IH 90 INT, Rock, WI

Built 2021 ADT: 59,100

IH 39 NB / IH 90 W

Over: STH 81

IH-39/90 & IH 43 INTERCHA, Rock, WI

Built 2021 ADT: 5,050

IH 43 NB

Over: IH 90

IH 43 / IH 39 / IH 90 INT, Rock, WI

Built 2021 ADT: 2,700

LRD HART RD

Over: IH 39/90

1.4 M N JCT IH-43, Rock, WI

Built 2016 ADT: 52,600

CTH S (SHOPIERE RD

Over: IH 39

2.4 M NORTH IH43, Rock, WI

Built 2015 ADT: 52,100

LRD CREEK ROAD

Over: IH 39 / IH 90

0.6 MI N OF JCT WITH CTH, Rock, WI

Built 2016 ADT: 57,700

IH 39 SB / IH 90 E

Over: LRD TOWN LINE RD

1.5M E JCT CTH G, Rock, WI

Built 2019 ADT: 2,000

IH 39 NB / IH 90 W

Over: LRD TOWN LINE RD

1.5M E JCT CTH G, Rock, WI

Built 2018 ADT: 1,208

LRD WOODMAN RD EB

Over: IH 39 / IH 90

LOCATION UNKNOWN, PLEASE, Rock, WI

Built 2017 ADT: 57,700

STH 11 EB (AVALON

Over: IH 39 / IH 90

7.4 MI N JCT IH 43, Rock, WI

Built 2016 ADT: 57,700

STH 11 WB (AVALON

Over: IH 39 / IH 90

7.4 M N JCT IH 43, Rock, WI

Built 2016 ADT: 57,700

LRD STATELINE RD E

Over: IH 39/90

LOCATION UNKNOWN, PLEASE, Rock, WI

Built 2017 ADT: 55,500

STH 11 / E. RACINE

Over: IH 39 SB

3.1 MI. S OF USH 14, Rock, WI

Built 2013 ADT: 59,200

IH 39 SB / IH 90 E

Over: LRD PALMER DRIVE

0.5M E JCT STH 11, Rock, WI

Built 2019 ADT: 2,500

IH 39 NB / IH 90 W

Over: LRD PALMER PARK DR

0.5M E JCT STH 11, Rock, WI

Built 2018 ADT: 2,500

IH 39 SB / IH 90 E

Over: LRD RUGER AVE

1.6M W JCT USH 14, Rock, WI

Built 2019 ADT: 4,300

IH 39 NB / IH 90 W

Over: LRD RUGER AVE

1.6M W JCT USH 14, Rock, WI

Built 2018 ADT: 6,200

IH 39 SB / IH 90 E

Over: LRD MT ZION AVE

1.3M N JCT STH 26, Rock, WI

Built 2019 ADT: 7,000

IH 39 NB / IH 90 W

Over: LRD MT ZION AVE

1.3M N JCT STH 26, Rock, WI

Built 2018 ADT: 7,400

IH 39 SB / IH 90 E

Over: USH 14

0.7M E JCT STH 26, Rock, WI

Built 2021 ADT: 28,800

IH 39 NB / IH 90 W

Over: USH 14

0.7M E JCT STH 26, Rock, WI

Built 2020 ADT: 28,800

CMSTPP RR

Over: USH 51

4.5M N JCT STH 81, Rock, WI

Built 1938 ADT: 8,240

IH 39 NB / IH 90 W

Over: LRD RYAN ROAD

0.2 MI E JCT MORSE ST, Rock, WI

Built 2020 ADT: 4,500

IH 39 SB / IH 90 E

Over: STH 26-MILTON AVE

0.4M N JCT USH 14, Rock, WI

Built 2021 ADT: 32,680

IH 39 NB / IH 90 W

Over: STH 26-MILTON AVE

0.4M N JCT USH 14, Rock, WI

Built 2020 ADT: 32,680

IH 39 SB / IH 90 E

Over: LRD KENNEDY RD & BIKE PA

0.9M N JCT USH 14, Rock, WI

Built 2021 ADT: 3,670

IH 39 NB / IH 90 W

Over: LRD KENNEDY RD

0.9M N JCT USH 14, Rock, WI

Built 2020 ADT: 3,670

IH 39SB/90 EB

Over: LRD TOWN LINE RD

1.7M W JCT CTH Y, Rock, WI

Built 2019 ADT: 1,600

IH 39 NB / IH 90 W

Over: LRD TOWN LINE RD

1.7M W JCT CTH Y, Rock, WI

Built 2020 ADT: 1,580

LRD MANOGUE ROAD

Over: IH 39 / IH 90

3.6M N JCT STH 26, Rock, WI

Built 2017 ADT: 53,500

IH 39 SB / IH 90 E

Over: CTH M

2.1M W JCT STH 59, Rock, WI

Built 2019 ADT: 1,300

IH 39NB/90 WB

Over: CTH M

2.1M W JCT STH 59, Rock, WI

Built 2020 ADT: 1,100

IH 39/90 SB/EB

Over: LRD NEWVILLE RD

1.2M N JCT CTH M, Rock, WI

Built 2019 ADT: 1,200

IH 39 NB/ IH 90 WB

Over: LRD NEWVILLE RD

1.2M N JCT CTH M, Rock, WI

Built 2020 ADT: 1,200

IH39SB/IH90EB

Over: ROCK RIVER / ELLENDALE R

0.1M N JCT STH 59, Rock, WI

Built 2018 ADT: 1,750

IH 39 NB

Over: ROCK RIVER

0.3 MI W JCT STH 59, Rock, WI

Built 2016 ADT: 1,750

STH 59

Over: IH 39

8.2 M N JCT STH 26, Rock, WI

Built 2016 ADT: 59,100

IH-39 SB/90 EB

Over: LRD RYAN ROAD

0.2 MI E JCT MORSE ST, Rock, WI

Built 2021 ADT: 4,540

BELOIT COLLEGE POW

Over: USH 51

99990000000 004, Rock, WI

CMSTPP RR

Over: USH 51-N PARKER DR

0.2M N JCT STH 26, Rock, WI

Built 1942 ADT: 12,480

CNW RR

Over: CTH E

1.2M S JCT USH 14, Rock, WI

Built 1902 ADT: 2,550

CNW RR

Over: LRD CAINVILLE RD

0.6M S JCT CTH A, Rock, WI

Built 1900 ADT: 75

CNW RR

Over: CTH J

0.7M N JCT CTH X, Rock, WI

Built 1905 ADT: 900

CMSTPP RR

Over: LRD CROSBY RD

0.2M S JCT STH 11, Rock, WI

Built 1900 ADT: 225

CMSTPP RR

Over: LRD CARVERS RD

2.7M S JCT USH 14, Rock, WI

Built 1906 ADT: 75

CMSTPP RR

Over: LRD MILTON RD

0.7M S JCT USH 14, Rock, WI

Built 1907 ADT: 150

CMSTPP RR

Over: LRD PRAIRIE AVE

0.3M E JCT USH 51, Rock, WI

Built 1930 ADT: 150

CNW RR

Over: CTH J

1.1M E JCT CTH S, Rock, WI

Built 1905 ADT: 610

CNW RR

Over: LRD ROCKPORT RD

0.3M W JCT USH 51, Rock, WI

Built 1900 ADT: 5,380

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