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

Fair-condition bridges (209)

IH 43

Fair

Over: BIG CREEK

0.7M N JCT USH 141 (S), Brown, WI

Built 1980 Load: 32.4 t ADT: 26,300

LRD ALLOUEZ AVE

Fair

Over: SPRING CREEK

0.1M W JCT IH 43, Brown, WI

Built 1980 Load: 32.4 t ADT: 7,600

STH 29

Fair

Over: W BR SUAMICO RIVER

0.4 MI E OF CO LINE, Brown, WI

Built 1988 Load: 32.4 t ADT: 15,900

LRD WAYSIDE ROAD

Fair

Over: PLUM CREEK

0.8M W JCT STH 57, Brown, WI

Built 1993 Load: 32.4 t ADT: 94

LRD SWAN ROAD

Fair

Over: BR EAST RIVER

0.4M S JCT CTH G, Brown, WI

Built 1995 Load: 32.4 t ADT: 110

CTH EB

Fair

Over: DUTCHMAN CREEK

0.1M N JCT CTH"AAA", Brown, WI

Built 1999 Load: 32.4 t ADT: 8,200

CTH JJ / VERLIN RO

Fair

Over: WILLOW CREEK

0.7M E OF CTH V, Brown, WI

Built 2003 Load: 32.4 t ADT: 7,200

LRD GUNS STREET

Fair

Over: WILLOW CREEK

0.2M SOUTH OF JCT CTH JJ, Brown, WI

Built 2004 Load: 32.4 t ADT: 1,500

LRD HALF CROWN RUN

Fair

Over: UNNAMED CREEK

0.1 MI N OF DOLLAR ROAD, Brown, WI

Built 2001 Load: 32.4 t ADT: 99

STH 29

Fair

Over: BEAVER DAM CR

0.1 MI W OF USH 41, Brown, WI

Built 2012 Load: 32.4 t ADT: 21,900

LRD BROOKSIDE RD

Fair

Over: BR SUAMICO RIVER

0.7M N JCT CTH U, Brown, WI

Built 1940 Load: 32.4 t ADT: 257

LRD LEDGEVIEW RD

Fair

Over: EAST RIVER

0.3M W JCT CTH X, Brown, WI

Built 1978 Load: 32.4 t ADT: 58

LRD HYDUKE LANE (D

Fair

Over: BRANCH DEVILS RIVER

500 FT N OF COOPERSTOWN R, Brown, WI

Built 1960 Load: 32.4 t ADT: 20

CTH QQ

Fair

Over: BAIRD CREEK

0.6M S JCT CTH N, Brown, WI

Built 1960 Load: 34.0 t ADT: 1,319

LRD GLENDALE AVE

Fair

Over: LANCASTER BROOK

0.2M W JCT CTH HS, Brown, WI

Built 1966 Load: 34.0 t ADT: 6,700

LRD LAKEVIEW DR

Fair

Over: LANCASTER BROOK

0.6M N JCT CTH HS, Brown, WI

Built 1968 Load: 34.0 t ADT: 2,291

IH RAMP IH 41 S-ST

Fair

Over: STH 172 WB

AT JCT USH 41-STH 172, Brown, WI

Built 1974 Load: 34.0 t ADT: 15,600

LRD WEST FRONTAGE

Fair

Over: ASHWAUBENON CREEK

0.3M N JCT CTH F, Brown, WI

Built 1983 Load: 34.0 t ADT: 348

STH 172 WB

Fair

Over: LRD EAST RIVER DRIVE

0.6M W JCT CTH XX, Brown, WI

Built 1984 Load: 34.0 t ADT: 42,350

STH 172 WB

Fair

Over: CTH V

1.2M W JCT IH 43 TO S, Brown, WI

Built 1984 Load: 34.0 t ADT: 25,450

STH 172 EB

Fair

Over: CTH V-LIME KILN RD

0.5M E JCT CTH GV, Brown, WI

Built 1984 Load: 34.0 t ADT: 25,450

IH 43 SB

Fair

Over: LRD E MASON ST

3.2M S JCT STH 54 TO E, Brown, WI

Built 1981 Load: 34.0 t ADT: 18,350

IH 43 NB

Fair

Over: LRD E MASON ST

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

Built 1981 Load: 34.0 t ADT: 18,350

STH 54 WB-STH 57 S

Fair

Over: LRD UNIVERSITY AVE

3.6M W JCT STH 57 TO N, Brown, WI

Built 1979 Load: 34.0 t ADT: 18,900

STH 29 WB

Fair

Over: STH 32

1.6M W JCT CTH U, Brown, WI

Built 1988 Load: 34.0 t ADT: 7,950

LRD COOPERSTOWN RD

Fair

Over: IH 43

2.5M E JCT CTH NN, Brown, WI

Built 1979 Load: 34.0 t ADT: 2,700

IH 43 SB

Fair

Over: LRD TOWN HALL RD

4.7M S JCT CTH MM TO W, Brown, WI

Built 1980 Load: 34.0 t ADT: 11,200

STH 32

Fair

Over: BR LITTLE SUAMICO RIVER

0.2M N JCT CTH B, Brown, WI

Built 1986 Load: 34.0 t ADT: 7,900

LRD BRIDGE RD

Fair

Over: SUAMICO RIVER

1.5M S JCT CTH B, Brown, WI

Built 1928 Load: 34.0 t ADT: 88

STH 29 - WALNUT ST

Fair

Over: FOX RIVER

3.2M E JCT USH 41 TO N, Brown, WI

Built 1986 Load: 34.0 t ADT: 11,100

LRD MOON VALLEY DR

Fair

Over: BAIRD CREEK

1.3M S JCT STH 54, Brown, WI

Built 1983 Load: 34.0 t ADT: 466

CTH C SHAWANO AV

Fair

Over: BR TROUT CREEK

1.1M N JCT HILLCREST HEIG, Brown, WI

Built 1987 Load: 34.0 t ADT: 4,700

STH 32

Fair

Over: BEAVER CREEK

2.1M W JCT STH 54, Brown, WI

Built 1987 Load: 34.0 t ADT: 26,394

LRD OVERLAND RD

Fair

Over: DUCK CREEK

0.3M N JCT STH 54, Brown, WI

Built 1971 Load: 34.0 t ADT: 205

STH 54

Fair

Over: DUCK CREEK

0.5M E JCT CTH J, Brown, WI

Built 2012 Load: 35.3 t ADT: 10,700

STH 172 EB

Fair

Over: CTH H BROADWAY ST

1.4M E JCT USH 41, Brown, WI

Built 1974 Load: 35.6 t ADT: 42,350

IH RAMP STH 172 EB

Fair

Over: IH 43

1.8M E JCT CTH GV, Brown, WI

Built 1981 Load: 35.6 t ADT: 19,900

USH 141-STH 29

Fair

Over: IH 43

2.6M N JCT STH 29 TO E, Brown, WI

Built 1980 Load: 35.6 t ADT: 6,700

LRD GREENBRIER RD

Fair

Over: IH 43

0.6M E JCT CTH JJ, Brown, WI

Built 1981 Load: 35.6 t ADT: 3,400

LRD MILITARY AVE

Fair

Over: IH 43

0.3M N JCT USH 141, Brown, WI

Built 1978 Load: 35.6 t ADT: 1,700

STH 29 EB

Fair

Over: STH 32

1.0M E JCT STH 156, Brown, WI

Built 1988 Load: 35.6 t ADT: 7,950

CTH A

Fair

Over: WEQUIOCK CREEK

0.3M S JCT CTH K, Brown, WI

Built 1978 Load: 35.6 t ADT: 1,300

STH 32-STH 57

Fair

Over: EAST RIVER

2.0M N JCT CTH K, Brown, WI

Built 1981 Load: 35.6 t ADT: 3,500

LRD LAMERS CLANCY

Fair

Over: EAST RIVER

1.4M W JCT STH 57, Brown, WI

Built 2000 Load: 35.6 t ADT: 41

CTH RK

Fair

Over: DUCK CREEK

AT DUCK CREEK, Brown, WI

Built 2011 Load: 36.0 t ADT: 11,730

LRD DANZ AVE

Fair

Over: BAIRD CREEK

0.6M N JCT STH X32, Brown, WI

Built 1962 Load: 37.3 t ADT: 10,504

LRD MASON ST

Fair

Over: EAST RIVER

1.0M E JCT STH 57, Brown, WI

Built 1973 Load: 37.3 t ADT: 29,071

STH 172 WB

Fair

Over: CTH GV - MONROE RD

0.5M W JCT CTH V, Brown, WI

Built 1984 Load: 37.3 t ADT: 30,550

STH 172 EB

Fair

Over: CTH GV - MONROE RD

2.9M E JCT STH 57, Brown, WI

Built 1984 Load: 37.3 t ADT: 30,550

STH 172 WB

Fair

Over: IH 43

0.5M W JCT IH 43 TO N, Brown, WI

Built 1980 Load: 37.3 t ADT: 11,000

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.