County profile · official public datasets

Green County, WI

244 public highway bridges tracked in the FHWA National Bridge Inventory: 45.5% rated Good, 45.9% Fair, 8.6% Poor.

244
Public bridges: 45.5%
Good condition: 8.6%
Poor condition

The verdict

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

Green County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

52nd
of 72 on Poor share: 8.6%
Poor-condition share: 244
public highway bridges: 1978
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.

Green County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Green County ranks #52 of 72 Wisconsin counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.6%). Green County, Wisconsin contains 244 public highway bridges. Roughly 45.5% are rated “Good,” 45.9% “Fair,” and 8.6% “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

244

Public highway bridges in Green County

Good condition

45.5%

111 of 244 rated 7-9

Fair condition

45.9%

112 of 244 rated 5-6

Poor condition

8.6%

21 of 244 rated 4 or below

In-state Poor-share rank

#52 of 72

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

Condition distribution

Share of 244 NBI-tracked bridges by lowest applicable component rating.

Good

45.5% (111)

Fair

45.9% (112)

Poor

8.6% (21)

Green County's Poor-condition bridges carry 7,982 vehicle crossings a day

That is 3.4% of the county's reported daily bridge traffic on 8.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 380 crossings a day against 794 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 244 of 244 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

38.5% of Green County's bridges have passed the 50-year mark

94 of the 244 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 45.5% 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 10.8% of the county's Poor-condition bridge traffic

CTH B over HONEY CREEK, built 1933, carries 860 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 21-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 7,982 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

2
1930s

26
1940s

8
1950s

27
1960s

25
1970s

25
1980s

30
1990s

47
2000s

37
2010s

13
2020s

3

What this shows Construction peaked in the 1990s, when 47 of the county's bridges still in the inventory were built, which is 19.3% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1978, 6 years older than the Wisconsin average of 1984.

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

The 5 Wisconsin counties nearest Green County in number of bridges, with their condition splits. Its 8.6% Poor share is the 5th-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1983 is 5 years older.

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

Bridge inventory size and condition shares for Green County and the 5 Wisconsin counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
La Crosse County	249	41%	53%	6%	1983
Pierce County	248	64.5%	31.9%	3.6%	1984
Dunn County	245	45.7%	45.3%	9%	1982
Green County (this page)	244	45.5%	45.9%	8.6%	1978
Sheboygan County	240	39.2%	55.4%	5.4%	1979
Wood County	239	62.3%	31.8%	5.9%	1986

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

Similar inventory size

Nearest county inventories outside WI (244 bridges here).

Spencer County, IN · 244 bridges
Norton County, KS · 244 bridges
Osborne County, KS · 244 bridges
Allegan County, MI · 244 bridges

Similar average build year

Nearest mean year-built outside WI (1978 here).

Orange County, CA · avg 1978 · 1,164 bridges
Sumner County, KS · avg 1978 · 659 bridges
Allen County, IN · avg 1978 · 613 bridges
Livingston County, IL · avg 1978 · 579 bridges

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

All 244 Good 111 Fair 112 Poor 21

Fair-condition bridges (112)

Sort:

Green County Bridge Snapshot

Condition distribution

Green County's Poor-condition bridges carry 7,982 vehicle crossings a day

38.5% of Green County's bridges have passed the 50-year mark

One structure carries 10.8% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (112)

LRD PATTERSON RD

STH 69

STH 69

CTH C

CTH S

LRD UNION RD

STH 92

CTH CC

CTH C

CTH J

STH 69 SB-STH 81 E

STH 59

LRD FIVE CORNER RD

STH 11

LRD WARD CREEK LAN

CTH HK

CTH S

LRD PRIEN RD

STH 11-STH 81

CTH K

STH 11 WB-STH 81 W

STH 11 EB-STH 81 E

LRD TIN CAN RD

CTH H

STH 81

LRD SILVER RD

CTH OK

CTH S

LRD COATES AVE

LRD JORDAN CENTER

LRD 4TH AVE WEST

LRD CLARNO RD

STH 69

CTH N

LRD ULLOM RD

STH 11

CTH F

STH 81

CTH OK

LRD FELDT RD

LRD OLD MADISON RD

CTH S

LRD SCHUEYVILLE RD

CTH N

CTH F 4TH ST

LRD TWIN GROVE RD

STH 92

LRD VINGER ROAD

CTH Y

CTH T

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