Rock County, WI

325 public highway bridges

Rock County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Rock County, Wisconsin contains 325 public highway bridges. Roughly 36.9% are rated “Good,” 26.8% “Fair,” and 3.4% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

325

Total Bridges

36.9%

Good

26.8%

Fair

3.4%

Poor Condition

Condition Distribution

Good

36.9% (120)

Fair

26.8% (87)

Poor

3.4% (11)

All Bridges (325)

Sort:

LRD E MEMORIAL DR

Over: USH 51-N PARKER DR

0.6M N JCT STH 26, Rock, WI

Built 1970 ADT: 15,900

IH 43 NB

Over: CTH X / HART RD

2.2M E JCT IH 90, Rock, WI

Built 1976 ADT: 3,300

IH 43 SB

Over: CTH X / HART RD

2.2M E JCT IH 90, Rock, WI

Built 1976 ADT: 3,300

IH 43 NB

Over: LRD SCHROEDER RD

0.5M N JCT CTH X, Rock, WI

Built 1975 ADT: 129

IH 43 SB

Over: LRD SCHROEDER RD

0.5M N JCT CTH X, Rock, WI

Built 1975 ADT: 129

IH 43 NB

Over: LRD BUSS RD

1.9M E JCT CTH J, Rock, WI

Built 1975 ADT: 533

IH 43 SB

Over: LRD BUSS RD

1.9M E JCT CTH J, Rock, WI

Built 1975 ADT: 533

IH 43 NB

Over: CTH J

1.3M N JCT CTH X, Rock, WI

Built 1975 ADT: 550

IH 43 NB

Over: STH 140

3.0M N JCT CTH P, Rock, WI

Built 1975 ADT: 4,400

IH 43 SB

Over: STH 140

3.1M N JCT CTH P, Rock, WI

Built 1975 ADT: 4,400

IH 43 NB

Over: LRD CARVERS ROCK RD

0.6M N JCT CTH X, Rock, WI

Built 1975 ADT: 176

IH 43 SB

Over: LRD CARVERS ROCK RD

0.6M N JCT CTH X, Rock, WI

Built 1975 ADT: 176

IH 43 NB

Over: LRD SUMMERVILLE RD

0.4M N JCT CTH X, Rock, WI

Built 1975 ADT: 147

IH 43 SB

Over: LRD SUMMERVILLE RD

0.4M N JCT CTH X, Rock, WI

Built 1975 ADT: 147

IH 43 SB

Over: CTH J

1.3M N JCT CTH X, Rock, WI

Built 1975 ADT: 550

LRD CROSBY - WILLA

Over: ROCK RIVER

AT CROSBY, Rock, WI

Built 1983 ADT: 99

LRD BLACK BRIDGE R

Over: LRD HAUL ROAD

CITY OF JANESVILLE, Rock, WI

Built 1983 ADT: 99

STH EB STH 11

Over: LRD READ RD

6.7M N JCT CTH S, Rock, WI

Built 1989 ADT: 429

USH 51

Over: CTH F

0.1M E JCT USH 14 TO E, Rock, WI

Built 1995 ADT: 641

STH 11

Over: LRD ROCKPORT RD

CITY OF JANESVILLE, Rock, WI

Built 2002 ADT: 99

CTH D

Over: STH 11

1.1M W OF JCT USH 51, Rock, WI

Built 2001 ADT: 99

STH EB STH 11

Over: LRD SOUTH RIVER ROAD

0.3M N OF JCT AVALON RD, Rock, WI

Built 2002 ADT: 99

STH WB STH 11

Over: LRD SOUTH RIVER ROAD

0.3M N OF JCT AVALON RD, Rock, WI

Built 2002 ADT: 1,500

STH EB STH 11

Over: LRD SOUTH OAKHILL AVE

0.1M N JCT W KNILANS RD, Rock, WI

Built 2002 ADT: 1,000

STH WB STH 11

Over: LRD SOUTH OAKHILL AVENUE

0.1M N JCT W KNILANS RD, Rock, WI

Built 2002 ADT: 99

IH 39 SB / IH 90 E

Over: LRD MILWAUKEE STREET

AT IH 90, Rock, WI

Built 2003 ADT: 8,600

IH 39 NB/ IH 90 WB

Over: LRD MILWAUKEE STREET

AT IH 90, Rock, WI

Built 2004 ADT: 8,600

IH 39 SB

Over: LRD COLLEY ROAD

AT IH 90, Rock, WI

Built 2003 ADT: 205

IH 39 NB/90 WB

Over: LRD COLLEY RD

AT IH90, Rock, WI

Built 2004 ADT: 205

STH 11 WB

Over: LRD S READ RD

AT STH11, Rock, WI

Built 2004 ADT: 150

LRD CRANSTON RD

Over: IH 90

0.7M E JCT IH 43, Rock, WI

Built 2003 ADT: 51,200

UNION PACIFIC RAIL

Over: LRD JACKSON STREET

AT UP RAILROAD, Rock, WI

Built 2004 ADT: 99

IH 39 SB / IH 90 E

Over: CTH O

AT IH 90, Rock, WI

Built 2003 ADT: 5,900

IH 39 NB/90 WB

Over: CTH O/ EAST DELAVAN ROAD

90, Rock, WI

Built 2004 ADT: 5,800

LRD HARMONY TOWN H

Over: STH 26

AT HARMONY TOWN HALL RD, Rock, WI

Built 2012 ADT: 17,500

LRD TOWNLINE ROAD

Over: STH 26

AT TOWNLINE ROAD, Rock, WI

Built 2012 ADT: 17,000

LRD HENKE RD

Over: STH 26 NB

AT HENKE RD, Rock, WI

Built 2013 ADT: 8,450

STH 26 NB

Over: STH 59

4.3 MI. N OF CTH Y, Rock, WI

Built 2013 ADT: 4,700

STH 26 SB

Over: STH 59

AT STH 26, Rock, WI

Built 2013 ADT: 4,700

STH 26 NB

Over: LRD E HIGH ST

0.4M E OF CTH M, Rock, WI

Built 2013 ADT: 750

STH 26 SB

Over: LRD E HIGH ST

0.4M E OF CTH M, Rock, WI

Built 2013 ADT: 750

STH 26 NB

Over: LRD STORRS LAKE ROAD

AT STH 26, Rock, WI

Built 2013 ADT: 100

STH 26 SB

Over: LRD STORRS LAKE RD

AT STH 26, Rock, WI

Built 2013 ADT: 100

STH 26 NB

Over: LRD BOWERS LAKE RD

AT STH 26, Rock, WI

Built 2013 ADT: 1,500

STH 26 SB

Over: LRD BOWERS LAKE RD

0.5M E OF N JANESVILLE ST, Rock, WI

Built 2013 ADT: 1,500

CTH N

Over: STH 26

AT CTH N, Rock, WI

Built 2012 ADT: 13,900

BIKE PATH

Over: STH 26

AT BIKE PATH, Rock, WI

Built 2012 ADT: 30,500

LRD WRIGHT RD

Over: STH 26

AT WRIGHT RD, Rock, WI

Built 2013 ADT: 18,000

IH 43 SB / STH 81

Over: IH 39 / IH 90

2.5M E JCT CTH S TO E, Rock, WI

Built 2021 ADT: 48,400

IH 43 NB / STH 81

Over: IH 39 / IH 90

2.5M E JCT CTH S TO E, Rock, WI

Built 2021 ADT: 48,400

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.