County profile · official public datasets

Green Lake County, WI

48 public highway bridges tracked in the FHWA National Bridge Inventory: 50% rated Good, 47.9% Fair, 2.1% Poor.

48
Public bridges: 50%
Good condition: 2.1%
Poor condition

The verdict

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

Green Lake County posts a top-5% lowest Poor-condition share among rated counties in the state across rated county bridge inventory.

Top 3%
lowest Poor share in state: 2.1%
Poor-condition share: 48
public highway bridges: 1983
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 Lake County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Green Lake County ranks #2 of 72 Wisconsin counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.1%). Green Lake County, Wisconsin contains 48 public highway bridges. Roughly 50% are rated “Good,” 47.9% “Fair,” and 2.1% “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

Public highway bridges in Green Lake County

Good condition

50%

24 of 48 rated 7-9

Fair condition

47.9%

23 of 48 rated 5-6

Poor condition

2.1%

1 of 48 rated 4 or below

In-state Poor-share rank

#2 of 72

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

Condition distribution

Share of 48 NBI-tracked bridges by lowest applicable component rating.

Good

50% (24)

Fair

47.9% (23)

Poor

2.1% (1)

Green Lake County's Poor-condition bridges carry 1,600 vehicle crossings a day

That is 2.3% of the county's reported daily bridge traffic on 2.1% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,600 crossings a day against 747 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 48 of 48 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

31.3% of Green Lake County's bridges have passed the 50-year mark

15 of the 48 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 50% 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 100% of the county's Poor-condition bridge traffic

CTH A MILLS ST over PUCKYAN RIVER, built 1929, carries 1,600 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 1-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,600 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

4
1930s

2
1950s

4
1960s

4
1970s

4
1980s

6
1990s

7
2000s

10
2010s

6
2020s

1

What this shows Construction peaked in the 2000s, when 10 of the county's bridges still in the inventory were built, which is 20.8% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1983) matches the Wisconsin average (1984).

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

The 5 Wisconsin counties nearest Green Lake County in number of bridges, with their condition splits. Its 2.1% Poor share is the 2nd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1985 is in line with the group.

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

Bridge inventory size and condition shares for Green Lake County and the 5 Wisconsin counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Forest County	53	52.8%	34%	13.2%	1984
Waushara County	53	47.2%	47.2%	5.7%	1982
Washburn County	49	51%	49%	0%	1990
Iron County	48	56.3%	35.4%	8.3%	1986
Green Lake County (this page)	48	50%	47.9%	2.1%	1983
Adams County	41	68.3%	29.3%	2.4%	1984

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

Similar inventory size

Nearest county inventories outside WI (48 bridges here).

Wakulla County, FL · 48 bridges
Evans County, GA · 48 bridges
Owyhee County, ID · 48 bridges
Carter County, MO · 48 bridges

Similar average build year

Nearest mean year-built outside WI (1983 here).

Dallas County, TX · avg 1983 · 3,230 bridges
Bexar County, TX · avg 1983 · 2,342 bridges
Sedgwick County, KS · avg 1983 · 1,333 bridges
Will County, IL · avg 1983 · 649 bridges

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

All 48 Good 24 Fair 23 Poor 1

All bridges (48)

Sort:

CTH H

Fair

Over: GRAND RIVER

1.2M S JCT CTH KK, Green Lake, WI

Built 1953 Load: 21.1 t ADT: 250

LRD SOUTH LAWSON D

Fair

Over: PUCHYAN RIVER

0.2M S JCT CTH A, Green Lake, WI

Built 1929 Load: 22.7 t ADT: 2,769

STH 23-STH 73-MAIN

Fair

Over: FOX RIVER

0.3M E JCT STH 73 TO N, Green Lake, WI

Built 1984 Load: 24.3 t ADT: 7,400

LRD MAIN ST

Fair

Over: GRAND RIVER

0.1M E JCT STH 44, Green Lake, WI

Built 1965 Load: 24.3 t ADT: 703

STH 23

Fair

Over: PUCHYAN RIVER

1.1M E JCT CTH A, Green Lake, WI

Built 1966 Load: 29.2 t ADT: 7,400

LRD VALLEY RD

Fair

Over: GRAND RIVER

1.2M N JCT CTH X, Green Lake, WI

Built 1982 Load: 29.2 t ADT: 47

CTH X

Fair

Over: BR GRAND RIVER

0.4M E JCT CTH M, Green Lake, WI

Built 1924 Load: 29.2 t ADT: 250

CTH A

Fair

Over: SILVER CREEK

1.2M N JCT CTH K, Green Lake, WI

Built 1958 Load: 30.8 t ADT: 3,200

LRD VILLAGE RD

Fair

Over: GRAND RIVER

0.1M S JCT CTH S, Green Lake, WI

Built 1963 Load: 30.8 t ADT: 208

LRD BRIDGE ST

Fair

Over: GRAND RIVER

0.2M E JCT STH 44, Green Lake, WI

Built 1975 Load: 30.8 t ADT: 820

CTH D

Fair

Over: BR FOX RIVER

1.0M S JCT CTH F, Green Lake, WI

Built 1976 Load: 32.4 t ADT: 283

CTH M

Fair

Over: FOX RIVER

0.7M S JCT CTH GG, Green Lake, WI

Built 1988 Load: 32.4 t ADT: 351

LRD PROSCARIAN ROA

Fair

Over: TRIB TO GRAND RIVER

0.33 MILES S OF CTH X, Green Lake, WI

Built 2010 Load: 32.4 t ADT: 153

LRD DEAD END RD

Fair

Over: SILVER CREEK

0.3M S JCT STH 23, Green Lake, WI

Built 1970 Load: 32.4 t ADT: 25

STH 44

Fair

Over: BELLE FOUNTAIN CREEK

0.1M N JCT CTH FF, Green Lake, WI

Built 1992 Load: 35.6 t ADT: 1,300

LRD FRANKLIN ST. /

Fair

Over: FOX RIVER

0.25M W JCT STH 49, Green Lake, WI

Built 2003 Load: 35.6 t ADT: 3,300

STH 73

Fair

Over: GRAND RIVER

1.6M N JCT CTH X, Green Lake, WI

Built 1934 Load: 35.6 t ADT: 1,800

STH 49

Fair

Over: BR FOX RIVER

0.9M N JCT CTH J, Green Lake, WI

Built 1957 Load: 37.3 t ADT: 3,400

STH 44-SOUTH ST

Fair

Over: GRAND RIVER

1.9M N JCT CTH X, Green Lake, WI

Built 1992 Load: 38.9 t ADT: 1,900

CTH J

Fair

Over: PUCHYAN RIVER

0.3M W JCT CTH A, Green Lake, WI

Built 1998 Load: 40.5 t ADT: 480

CTH B

Fair

Over: BELLE FOUNTAIN CREEK

1.0M W JCT CTH FFF, Green Lake, WI

Built 2006 Load: 42.1 t ADT: 390

STH 49

Fair

Over: BR FOX RIVER

2.7M N JCT CTH J, Green Lake, WI

Built 1957 Load: 47.0 t ADT: 3,400

STH 49-HURON ST

Fair

Over: FOX RIVER

0.2M N JCT STH 116, Green Lake, WI

Green Lake County Bridge Snapshot

Condition distribution

Green Lake County's Poor-condition bridges carry 1,600 vehicle crossings a day

31.3% of Green Lake County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

How Green Lake 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

All bridges (48)

CTH H

LRD SOUTH LAWSON D

STH 23-STH 73-MAIN

LRD MAIN ST

STH 23

LRD VALLEY RD

CTH X

CTH A

LRD VILLAGE RD

LRD BRIDGE ST

CTH D

CTH M

LRD PROSCARIAN ROA

LRD DEAD END RD

STH 44

LRD FRANKLIN ST. /

STH 73

STH 49

STH 44-SOUTH ST

CTH J

CTH B

STH 49

STH 49-HURON ST

LRD FRIESLAND RD

LRD SPAULDING HILL

CTH S

CTH A

LRD UTLEY ROAD

STH 49-WASHINGTON

CTH A

CTH B

LRD BERLIN RD

LRD GILLETTE DR NB

CTH BB

CTH I

STH 44-MARGARET ST

CTH Q

CTH D

LRD WHITE RIVER RD

STH 44-MANCHESTER

CTH S

LRD LOVERS LANE

CTH A

LRD LAWSON DR

CTH FF

STH 73

CTH K

CTH A MILLS ST

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