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 41 SB

Good

Over: STH 172 EB

1.7 MI S JCT LOMBARDI AVE, Brown, WI

Built 2016 Load: 34.3 t ADT: 41,600

IH 41 SB

Good

Over: LRD MEMORIAL DR

OVER MEMORIAL DRIVE, Brown, WI

Built 2014 Load: 34.3 t ADT: 31,200

LRD COOPERSTOWN RD

Good

Over: DEVILS RIVER

2.4M W JCT CTH T, Brown, WI

Built 2018 Load: 34.7 t ADT: 200

STH 32 NB-STH 57 N

Good

Over: CTH PP

4.8M N JCT CTH ZZ TO W, Brown, WI

Built 2023 Load: 34.7 t ADT: 2,800

IH 41 NB

Good

Over: STH 172 EB

AT STH 172, Brown, WI

Built 2015 Load: 34.7 t ADT: 41,600

CTH M / LINEVILLE

Good

Over: USH 41

AT USH 41, Brown, WI

Built 2014 Load: 35.0 t ADT: 14,600

LRD FAIR RD

Good

Over: BR EAST RIVER

0.9M W JCT STH 57, Brown, WI

Built 2016 Load: 35.3 t ADT: 1,200

IH 41 NB & IH 43 N

Good

Over: IH 41 SB TO IH 43 SB

AT DUCK CREEK, Brown, WI

Built 2015 Load: 35.3 t ADT: 33,950

STH 172 WB

Good

Over: USH STH 32-USH B41 (ASHL

1.3M W JCT STH 57, Brown, WI

Built 1975 Load: 35.6 t ADT: 42,350

CTH G

Good

Over: BRANCH RIVER

0.6M N JCT CTH Z, Brown, WI

Built 1998 Load: 35.6 t ADT: 1,800

CTH P

Good

Over: SCHOOL CREEK

0.1M S JCT STH 54, Brown, WI

Built 2004 Load: 35.6 t ADT: 1,350

IH 41 SB

Good

Over: LRD LITTLE RAPIDS RD

4.5M S JCT CTH EE, Brown, WI

Built 2000 Load: 35.6 t ADT: 28,200

IH 43

Good

Over: LRD KLONDIKE RD

2.7M N JCT USH 141 TO N, Brown, WI

Built 1980 Load: 35.6 t ADT: 29,500

IH RAMP IH 43 NB-S

Good

Over: STH 54 EB-STH 57 NB

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

Built 1979 Load: 35.6 t ADT: 3,100

IH RAMP IH 43 NB-W

Good

Over: LRD IRWIN AVE

0.1M E JCT WEBSTER AVE, Brown, WI

Built 1978 Load: 35.6 t ADT: 4,300

LRD CTH"EA"-HURON

Good

Over: BAIRD CREEK

1.8M S JCT STH 54, Brown, WI

Built 1980 Load: 35.6 t ADT: 6,200

LRD MIDWAY RD

Good

Over: EAST RIVER

0.4M E JCT STH 57, Brown, WI

Built 1994 Load: 35.6 t ADT: 268

LRD WEST FRONTAGE

Good

Over: APPLE CREEK

2.4M S JCT CTH S, Brown, WI

Built 1999 Load: 35.6 t ADT: 976

LRD EAST FRONTAGE

Good

Over: APPLE CREEK

2.4M S JCT CTH S, Brown, WI

Built 1999 Load: 35.6 t ADT: 976

LRD CHURCH RD

Good

Over: WEQUOICK CREEK

0.1M E OF STH "57", Brown, WI

Built 2003 Load: 35.6 t ADT: 795

LRD RIVER RD

Good

Over: BRANCH RIVER

2.3M S JCT CTH Z, Brown, WI

Built 2004 Load: 35.6 t ADT: 105

CTH S

Good

Over: ASHWAUBENON CR

100" EAST OF CTH "U", Brown, WI

Built 2004 Load: 35.6 t ADT: 4,500

CTH M

Good

Over: SUAMICO RIVER

0.1M S JCT CTH B, Brown, WI

Built 2021 Load: 35.6 t ADT: 1,600

IH STH 29 EB/STH 3

Good

Over: LRD BADGERLAND DR/CN RAI

TBD, Brown, WI

Built 2012 Load: 35.6 t ADT: 8,900

LRD MALLARD RD

Good

Over: EAST RIVER

1.02M W JCT STH 57, Brown, WI

Built 2020 Load: 36.0 t ADT: 100

CTH X S. WEBSTER

Good

Over: WISCONSIN CENTRAL LTD RR

1.6 M N JCT STH 172, Brown, WI

Built 2016 Load: 36.3 t ADT: 12,500

LRD WANEK RD

Good

Over: BR DEVILS RIVER

1.6M S JCT STH 96, Brown, WI

Built 2018 Load: 36.3 t ADT: 70

LRD CHANTEL ST

Good

Over: BEAVER DAM CREEK

0.4M S JCT STH 54, Brown, WI

Built 2023 Load: 36.3 t ADT: 800

CTH F (SCHEURING R

Good

Over: IH 41

1.3 MI W OF CTH D, Brown, WI

Built 2011 Load: 36.3 t ADT: 10,700

IH 41

Good

Over: ASHWAUBENON CR

AT ASHWAUBENON CREEK, Brown, WI

Built 2012 Load: 36.3 t ADT: 74,600

IH 41 SB

Good

Over: LRD 9TH ST

OVER 9TH STREET, Brown, WI

Built 2012 Load: 36.3 t ADT: 41,950

IH 41 NB OFF RAMP

Good

Over: LRD VELP AVE / USH 141

AT VELP, Brown, WI

Built 2015 Load: 36.3 t ADT: 11,700

IH 41 SB

Good

Over: WISCONSIN CENTRAL LTD

.4 MILES N OF JCT USH 141, Brown, WI

Built 2016 Load: 36.3 t ADT: 26,450

IH 41 NB

Good

Over: WISCONSIN CENTRAL LTD RR

.4 MILES N OF JCT USH 141, Brown, WI

Built 2015 Load: 36.3 t ADT: 26,450

USH 41 SB-USH 141

Good

Over: DUCK CREEK

10.9M S JCT CTH S, Brown, WI

Built 2016 Load: 36.3 t ADT: 34,800

LRD PARK VIEW RD

Good

Over: DEVILS RIVER

2.3M S JCT STH 96, Brown, WI

Built 2020 Load: 36.6 t ADT: 20

CTH R

Good

Over: LRD WALL ST

1.9M N JCT CTH P, Brown, WI

Built 2020 Load: 36.6 t ADT: 3,100

IH 41 NB RAMP

Good

Over: LRD ONEIDA STREET

AT ONEIDA ST., Brown, WI

Built 2014 Load: 36.6 t ADT: 29,650

IH 41 SB-WEST

Good

Over: LRD LARSEN RD

AT LARSEN RD, Brown, WI

Built 2012 Load: 36.6 t ADT: 41,250

CTH VV

Good

Over: STH 29

CTH VV OVER STH 29, Brown, WI

Built 2022 Load: 36.9 t ADT: 7,600

IH 41 NB

Good

Over: CTH EE

2.8M S JCT STH 172, Brown, WI

Built 2013 Load: 36.9 t ADT: 29,050

IH 41 NB ON RAMP F

Good

Over: STH 172 WB

STH 172 WB, Brown, WI

Built 2014 Load: 36.9 t ADT: 2,200

STH 32- ASHLAND AV

Good

Over: LRD 5TH ST

2.1M N JCT STH 172, Brown, WI

Built 1955 Load: 37.3 t ADT: 27,772

STH 172 EB

Good

Over: USH STH 32-USH B41(ASHLA

1.1M E JCT USH 41, Brown, WI

Built 1975 Load: 37.3 t ADT: 42,350

CTH S

Good

Over: IH 41

AT IH 41, Brown, WI

Built 1999 Load: 37.3 t ADT: 5,500

IH 41 NB

Good

Over: LRD LITTLE RAPIDS RD

6.6M N JCT CTH JJ, Brown, WI

Built 2000 Load: 37.3 t ADT: 28,200

STH 96

Good

Over: BRANCH RIVER

2.3M E JCT CTH W, Brown, WI

Built 1983 Load: 37.3 t ADT: 1,500

LRD NORFIELD ROAD

Good

Over: USH 41 - USH 141

TOWN OF SUAMICO, Brown, WI

Built 2000 Load: 37.3 t ADT: 600

STH 57 NB

Good

Over: STH 54

3.5M N JCT CTH A TO N, Brown, WI

Built 1999 Load: 37.3 t ADT: 18,900

USH 141-STH 29-MAI

Good

Over: BAIRD CREEK

5.5M N JCT STH 29 TO E, Brown, WI

Built 1998 Load: 37.3 t ADT: 22,037

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.