County profile · official public datasets

Dunn County, WI

245 public highway bridges tracked in the FHWA National Bridge Inventory: 45.7% rated Good, 45.3% Fair, 9% Poor.

245
Public bridges
45.7%
Good condition
9%
Poor condition

The verdict

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

Dunn County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

55th
of 72 on Poor share
9%
Poor-condition share
245
public highway bridges
1982
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.

Dunn County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Dunn County ranks #55 of 72 Wisconsin counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9%). Dunn County, Wisconsin contains 245 public highway bridges. Roughly 45.7% are rated “Good,” 45.3% “Fair,” and 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

245

Public highway bridges in Dunn County

Good condition

45.7%

112 of 245 rated 7-9

Fair condition

45.3%

111 of 245 rated 5-6

Poor condition

9%

22 of 245 rated 4 or below

In-state Poor-share rank

#55 of 72

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

Condition distribution

Share of 245 NBI-tracked bridges by lowest applicable component rating.

Good
45.7% (112)
Fair
45.3% (111)
Poor
9% (22)

Dunn County's Poor-condition bridges carry 48,757 vehicle crossings a day

That is 5.9% of the county's reported daily bridge traffic on 9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,216 crossings a day against 3,028 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 245 of 245 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

34.7% of Dunn County's bridges have passed the 50-year mark

85 of the 245 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 45.7% 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 71.2% of the county's Poor-condition bridge traffic

IH 94 over E BR WILSON CREEK, built 1959, carries 34,700 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 22-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 48,757 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Dunn County's bridges were built

245 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 46 of the county's bridges still in the inventory were built, which is 18.8% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1982) matches the Wisconsin average (1984).

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

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

The 5 Wisconsin counties nearest Dunn County in number of bridges, with their condition splits. Its 9% Poor share is the 5th-lowest of these 6. Its average build year of 1982 against a peer-group mean of 1982 is in line with the group.

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

Bridge inventory size and condition shares for Dunn County and the 5 Wisconsin counties closest to it in inventory size
County Bridges Poor
Fond du Lac County 251 10.4%
La Crosse County 249 6%
Pierce County 248 3.6%
Dunn County (this page) 245 9%
Green County 244 8.6%
Sheboygan County 240 5.4%

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 Dunn 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 Dunn County, both outside Wisconsin so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside WI (245 bridges here).

Similar average build year

Nearest mean year-built outside WI (1982 here).

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

All 245 Good 112 Fair 111 Poor 22

Poor-condition bridges (22)

LRD W. BOUNDARY RO

Poor

Over: SANDY CREEK

0.3M N JCT STH 170, Dunn, WI

Built 1975 Load: 11.3 t ADT: 138

CTH V

Poor

Over: SAND CREEK

0.1M N JCT CTH M, Dunn, WI

Built 1934 Load: 17.8 t ADT: 700

LRD 390TH ST

Poor

Over: WILSON CREEK

0.4M S JCT USH 12, Dunn, WI

Built 1972 Load: 17.8 t ADT: 1,196

IH 94

Poor

Over: E BR WILSON CREEK

8.9M E JCT CTH Q TO N, Dunn, WI

Built 1959 Load: 19.4 t ADT: 34,700

CTH J

Poor

Over: COON CREEK

2.9M N JCT STH 25, Dunn, WI

Built 1944 Load: 19.4 t ADT: 639

CTH P

Poor

Over: IRVING CREEK

1.4M W JCT CTH K, Dunn, WI

Built 1938 Load: 19.4 t ADT: 324

LRD HALL ESTATE RD

Poor

Over: IH 94

1.1M E JCT CTH Q, Dunn, WI

Built 1958 Load: 21.1 t ADT: 110

CTH D

Poor

Over: HAY RIVER

1.5M E JCT CTH G, Dunn, WI

Built 1962 Load: 21.1 t ADT: 1,308

CTH BB

Poor

Over: TAINTER LAKE

1.7M E JCT STH 25, Dunn, WI

Built 1935 Load: 21.1 t ADT: 2,231

CTH C

Poor

Over: MUDDY CREEK

0.67M E JCT CTH J, Dunn, WI

Built 1966 Load: 21.1 t ADT: 1,400

USH 12

Poor

Over: WILSON CREEK

1.7M E JCT CTH O TO N, Dunn, WI

Built 1934 Load: 22.7 t ADT: 2,900

LRD 810TH ST.

Poor

Over: CRANBERRY CREEK

0.5M S JCT STH 85, Dunn, WI

Built 1919 Load: 22.7 t ADT: 108

CTH N

Poor

Over: BR RED CEDAR RIVER

0.7M N JCT STH 170, Dunn, WI

Built 1934 Load: 22.7 t ADT: 213

CTH Q

Poor

Over: WILSON CREEK

2.3M N JCT USH 12, Dunn, WI

Built 1944 Load: 22.7 t ADT: 213

CTH D

Poor

Over: RED CEDAR RIVER

2.8M S JCT STH 25, Dunn, WI

Built 1975 Load: 24.3 t ADT: 1,501

CTH Q

Poor

Over: BOLEN CREEK

0.4M N JCT STH 64, Dunn, WI

Built 1968 Load: 24.3 t ADT: 113

LRD 770TH AVE

Poor

Over: CLACK CREEK

0.2M W JCT STH 79, Dunn, WI

Built 1957 Load: 25.9 t ADT: 58

LRD 360TH ST (DEAD

Poor

Over: CLACK CREEK

0.3M N JCT STH 79, Dunn, WI

Built 1934 Load: 27.5 t ADT: 29

CTH V ELLIOT ST

Poor

Over: S FK LOWER PINE CREEK

0.1M S JCT CTH AA, Dunn, WI

Built 1947 Load: 27.5 t ADT: 213

CTH HH

Poor

Over: SPRING CREEK

0.22M E OF CTH H-NORTH, Dunn, WI

Built 1937 Load: 37.3 t ADT: 50

CTH V

Poor

Over: FLAYTON CREEK

0.7M N JCT STH 64, Dunn, WI

Built 1958 Load: 40.5 t ADT: 400

CTH N

Poor

Over: N BR GILBERT CREEK

0.9M W JCT CTH Q, Dunn, WI

Built 1944 Load: 43.7 t ADT: 213

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

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.