County profile · official public datasets

Brown County, WI

466 public highway bridges tracked in the FHWA National Bridge Inventory: 51.3% rated Good, 44.8% Fair, 3.9% Poor.

466
Public bridges
51.3%
Good condition
3.9%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Brown County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 25%
lowest Poor share in state
3.9%
Poor-condition share
466
public highway bridges
1990
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Brown County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Brown County ranks #18 of 72 Wisconsin counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.9%). Brown County, Wisconsin contains 466 public highway bridges. Roughly 51.3% are rated “Good,” 44.8% “Fair,” and 3.9% “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.

Total bridges

466

Public highway bridges in Brown County

Good condition

51.3%

239 of 466 rated 7-9

Fair condition

44.8%

209 of 466 rated 5-6

Poor condition

3.9%

18 of 466 rated 4 or below

In-state Poor-share rank

#18 of 72

Among Wisconsin counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 466 NBI-tracked bridges by lowest applicable component rating.

Good
51.3% (239)
Fair
44.8% (209)
Poor
3.9% (18)

Brown County's Poor-condition bridges carry 62,050 vehicle crossings a day

That is 0.9% of the county's reported daily bridge traffic on 3.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,447 crossings a day against 13,869 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 466 of 466 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

22.1% of Brown County's bridges have passed the 50-year mark

103 of the 466 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 51.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 18.3% of the county's Poor-condition bridge traffic

LRD LARSON RD over BEAVER CREEK, built 1978, carries 11,375 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 18-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 62,050 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Brown County's bridges were built

466 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 119 of the county's bridges still in the inventory were built, which is 25.5% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1990, 6 years newer than the Wisconsin average of 1984.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Brown County compares with Wisconsin's closest counties by inventory size

The 5 Wisconsin counties nearest Brown County in number of bridges, with their condition splits. Its 3.9% Poor share is the 2nd-lowest of these 6. Its average build year of 1990 against a peer-group mean of 1983 is 7 years newer.

Showing the 5 closest of 71 Wisconsin counties eligible for comparison.

Bridge inventory size and condition shares for Brown County and the 5 Wisconsin counties closest to it in inventory size
County Bridges Poor
Marathon County 530 10.2%
Brown County (this page) 466 3.9%
Grant County 383 4.4%
Monroe County 374 3.5%
Waukesha County 369 6.5%
Chippewa County 359 9.2%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Brown County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Brown County, both outside Wisconsin so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside WI (466 bridges here).

Similar average build year

Nearest mean year-built outside WI (1990 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 466 Good 239 Fair 209 Poor 18

Good-condition bridges (239)

IH 43 SB

Good

Over: LRD UNIVERSITY AVE

0.9M S JCT STH 54 TO E, Brown, WI

Built 1979 Load: 21.1 t ADT: 16,900

CTH C SHAWANO AV

Good

Over: LANCASTER BROOK

0.2M W JCT HILLCREST HGTS, Brown, WI

Built 1991 Load: 21.1 t ADT: 4,100

LRD HARBOR LIGHTS

Good

Over: USH 41-USH 141

0.5M W JCT CTH J, Brown, WI

Built 1971 Load: 22.7 t ADT: 1,000

IH RAMP IH 43 SB-S

Good

Over: STH 54 WB-STH 57 SB

AT JCT IH 43-STH 54-57, Brown, WI

Built 1979 Load: 24.3 t ADT: 8,100

LRD MEADOW LARK RD

Good

Over: EAST RIVER

0.9M W JCT STH 57, Brown, WI

Built 1976 Load: 24.3 t ADT: 47

LRD HILLCREST HEIG

Good

Over: LANCASTER BROOK

0.8M N JCT STH 29, Brown, WI

Built 1977 Load: 24.3 t ADT: 4,800

LRD SUPERIOR RD

Good

Over: BAIRD CREEK

0.1M E JCT IH 43, Brown, WI

Built 1977 Load: 25.9 t ADT: 1,175

IH 43 NB

Good

Over: LRD PINE GROVE RD

5.6M N JCT STH 96 TO E, Brown, WI

Built 1980 Load: 25.9 t ADT: 11,150

IH 41SB ON RAMP FR

Good

Over: CTH G

2.3M S JCTH STH 172, Brown, WI

Built 2012 Load: 27.2 t ADT: 10,200

STH 32-STH 57

Good

Over: N BR EAST RIVER

3.4M N JCT STH 96, Brown, WI

Built 1988 Load: 27.5 t ADT: 5,000

LRD ALLOUEZ AVE

Good

Over: IH 43

1.2M E JCT CTH V, Brown, WI

Built 1981 Load: 29.2 t ADT: 5,700

IH 43 NB

Good

Over: LRD UNIVERSITY AVE

0.1M N JCT STH 54 TO E, Brown, WI

Built 1979 Load: 29.2 t ADT: 16,900

LRD OLD MARTIN ROA

Good

Over: EAST RIVER

0.7M W JCT CTH PP, Brown, WI

Built 1979 Load: 29.2 t ADT: 117

CTH EB

Good

Over: LANCASTER BROOK

0.4M N JCT CTH J, Brown, WI

Built 1992 Load: 29.2 t ADT: 2,762

IH 41 NB

Good

Over: APPLE CREEK

3.4M N JCT CTH JJ, Brown, WI

Built 1963 Load: 30.8 t ADT: 26,700

STH 172 EB

Good

Over: EAST RIVER

1.7M E JCT STH 57, Brown, WI

Built 1982 Load: 30.8 t ADT: 42,350

LRD FAIRVIEW RD

Good

Over: DEVILS RIVER

2.3M S JCT STH 96, Brown, WI

Built 1985 Load: 30.8 t ADT: 115

IH 41 NB

Good

Over: LRD ONEIDA STREET

0.5M N JCT PARKVIEW RD., Brown, WI

Built 2015 Load: 31.4 t ADT: 37,300

STH 29-STH 32

Good

Over: LANCASTER BROOK

0.9M E JCT CTH FF, Brown, WI

Built 1955 Load: 32.4 t ADT: 33,800

USH STH 32 NB-USH

Good

Over: DUTCHMANS CREEK

0.15 MI N OF CTH YY (PILG, Brown, WI

Built 1956 Load: 32.4 t ADT: 10,500

USH 41 NB-USH 141

Good

Over: LRD RIVERSIDE DR. & SUAM

5.6M N JCT USH 141 TO S, Brown, WI

Built 1970 Load: 32.4 t ADT: 22,250

IH 41 SB

Good

Over: APPLE CREEK

2.4M S JCT CTH S, Brown, WI

Built 1987 Load: 32.4 t ADT: 26,700

LRD OLD STH 29

Good

Over: BR SUAMICO RIVER

0.5M W JCT CTH U, Brown, WI

Built 1988 Load: 32.4 t ADT: 113

STH 172 EB

Good

Over: DUTCHMANS CREEK

0.9M E JCT USH 41, Brown, WI

Built 1973 Load: 32.4 t ADT: 29,450

STH 172 EB OFF RAM

Good

Over: DUTCHMANS CREEK

AT JCT STH 32-172-B41, Brown, WI

Built 1973 Load: 32.4 t ADT: 5,800

STH 172

Good

Over: BIG CREEK

0.1M E JCT CTH V, Brown, WI

Built 1979 Load: 32.4 t ADT: 50,900

IH RAMP IH 43 SB-S

Good

Over: BOWER CREEK

0.8M E JCT CTH V, Brown, WI

Built 1979 Load: 32.4 t ADT: 19,100

CTH Z

Good

Over: EAST RIVER

0.6M W JCT STH 57, Brown, WI

Built 1976 Load: 32.4 t ADT: 1,100

STH 96

Good

Over: EAST RIVER

1.7M E JCT CTH D TO S, Brown, WI

Built 1985 Load: 32.4 t ADT: 4,700

LRD VAN LANNEN RD

Good

Over: BR KEWAUNEE RIVER

0.8M E JCT CTH P, Brown, WI

Built 1998 Load: 32.4 t ADT: 112

LRD HANSEN RD

Good

Over: DUTCHMANS CREEK

0.8M W JCT CTH AAA, Brown, WI

Built 1989 Load: 32.4 t ADT: 2,300

LRD BIG APPLE RD

Good

Over: BOWER CREEK

0.6M N JCT CTH X, Brown, WI

Built 1989 Load: 32.4 t ADT: 58

LRD BIG CREEK RD

Good

Over: SORENSONS CREEK

0.6M E JCT STH 29, Brown, WI

Built 1993 Load: 32.4 t ADT: 16

LRD EAST FRONTAGE

Good

Over: ASHWAUBENON CREEK

2.2M N JCT CTH F, Brown, WI

Built 2002 Load: 32.4 t ADT: 2,200

LRD MALONEY RD

Good

Over: WEQUIOCK CREEK

0.1 MI SOUTH OF STH 54, Brown, WI

Built 1999 Load: 32.4 t ADT: 238

STH 57

Good

Over: WEQUOICK CREEK

1.0M N JCT STH 54 TO E, Brown, WI

Built 1999 Load: 32.4 t ADT: 18,100

LRD FAIR ROAD

Good

Over: EAST RIVER

1.7M W JCT STH 57, Brown, WI

Built 1995 Load: 32.4 t ADT: 94

CTH G

Good

Over: EAST RIVER

0.4M W JCT CTH GV, Brown, WI

Built 2001 Load: 32.4 t ADT: 9,700

CTH O (ALLOUEZ AVE

Good

Over: WILLOW CREEK

0.2M EAST OF CTH XX, Brown, WI

Built 2005 Load: 32.4 t ADT: 10,500

LRD BUNKER HILL RO

Good

Over: BRANCH OF EAST RIVER

0.3M SOUTH OF STH 96, Brown, WI

Built 2002 Load: 32.4 t ADT: 112

CTH V

Good

Over: WILLOW CREEK

0.3M N JCT CTH O, Brown, WI

Built 2003 Load: 32.4 t ADT: 13,200

CTH V - LIMEKILN R

Good

Over: TRIB-WILLOW CREEK

0.2M NORTH OF CTH JJ, Brown, WI

Built 2004 Load: 32.4 t ADT: 11,000

LRD S. HURON ROAD

Good

Over: TRIB. TO SPRING CREEK

0.3M NOF CTH - JJ, Brown, WI

Built 2005 Load: 32.4 t ADT: 4,000

CTH H - BROADWAY S

Good

Over: ASHWAUBENON CR

1.3M N JCT STH 32, Brown, WI

Built 2011 Load: 32.4 t ADT: 3,100

CTH GV/MONROE RD.

Good

Over: EAST RIVER TRIBUTARY

1.4 MI S JCT STH 172, Brown, WI

Built 2012 Load: 32.4 t ADT: 14,900

CTH GV/MONROE RD.

Good

Over: EAST RIVER TRIBUTARY

1.1 MI S JCT STH 172, Brown, WI

Built 2012 Load: 32.4 t ADT: 14,900

CTH GV/MONROE RD.

Good

Over: BOWER CREEK TRIBUTARY

0.8 MI S JCT STH 172, Brown, WI

Built 2012 Load: 32.4 t ADT: 14,900

CTH JJ

Good

Over: BAIRDS CREEK TRIBUTARY

1.4M E JCT CTH QQ, Brown, WI

Built 2013 Load: 32.4 t ADT: 750

CTH G

Good

Over: BOWER CREEK TRIBUTARY

100 N OF PINE GROVE ROAD, Brown, WI

Built 2012 Load: 32.4 t ADT: 2,300

CTH T

Good

Over: UNNAMED STREAM

3.8 MI S JCT STH 29, Brown, WI

Built 2016 Load: 32.4 t ADT: 1

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

Related

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

Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.