Total bridges
48
Public highway bridges in Green Lake County
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.
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.
When Green Lake County's bridges were built
48 bridges with a recorded construction year, grouped by decade
- 1920s
1920–1929
4 bridges
- 1930s 2
1930–1939
2 bridges
- 1950s
1950–1959
4 bridges
- 1960s
1960–1969
4 bridges
- 1970s
1970–1979
4 bridges
- 1980s
1980–1989
6 bridges
- 1990s
1990–1999
7 bridges
- 2000s
2000–2009
10 bridges
- 2010s
2010–2019
6 bridges
- 2020s 1
2020–2029
1 bridges
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.
| 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.
Poor-condition bridges (1)
Read our methodology - how this data is sourced, computed, and verified.
Related
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.