Total bridges
100
Public highway bridges in Oceana County
County profile · official public datasets
Oceana County, MI
100 public highway bridges tracked in the FHWA National Bridge Inventory: 31% rated Good, 64% Fair, 5% Poor.
- 100
- Public bridges
- 31%
- Good condition
- 5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Oceana County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 13%
- lowest Poor share in state
- 5%
- Poor-condition share
- 100
- public highway bridges
- 1977
- 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.
Oceana County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Oceana County ranks #11 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5%). Oceana County, Michigan contains 100 public highway bridges. Roughly 31% are rated “Good,” 64% “Fair,” and 5% “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
31%
31 of 100 rated 7-9
Fair condition
64%
64 of 100 rated 5-6
Poor condition
5%
5 of 100 rated 4 or below
In-state Poor-share rank
#11 of 83
Among Michigan counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 100 NBI-tracked bridges by lowest applicable component rating.
Good 31% (31)
Fair 64% (64)
Poor 5% (5)
Oceana County's Poor-condition bridges carry 5,673 vehicle crossings a day
That is 2.7% of the county's reported daily bridge traffic on 5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,135 crossings a day against 1,232 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 100 of 100 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
34% of Oceana County's bridges have passed the 50-year mark
34 of the 100 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 31% 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 77.8% of the county's Poor-condition bridge traffic
US-31 SB over N BRANCH PENTWATER RIVER, built 1980, carries 4,413 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 5-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 5,673 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Oceana County's bridges were built
100 bridges with a recorded construction year, grouped by decade
- 1910s 5
1910–1919
5 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 3
1930–1939
3 bridges
- 1950s 11
1950–1959
11 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s
1970–1979
35 bridges
- 1980s 10
1980–1989
10 bridges
- 1990s 10
1990–1999
10 bridges
- 2000s 12
2000–2009
12 bridges
- 2010s 7
2010–2019
7 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1970s, when 35 of the county's bridges still in the inventory were built, which is 35% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1977) matches the Michigan average (1976).
How Oceana County compares with Michigan's closest counties by inventory size
The 5 Michigan counties nearest Oceana County in number of bridges, with their condition splits. Its 5% Poor share is the 2nd-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1977 is in line with the group.
Showing the 5 closest of 82 Michigan counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Hillsdale County | 105 | 24.8% | 58.1% | 17.1% | 1973 |
| Gogebic County | 104 | 23.1% | 59.6% | 17.3% | 1969 |
| Osceola County | 103 | 38.8% | 54.4% | 6.8% | 1983 |
| Oceana County (this page) | 100 | 31% | 64% | 5% | 1977 |
| Clare County | 96 | 38.5% | 58.3% | 3.1% | 1984 |
| Menominee County | 96 | 47.9% | 42.7% | 9.4% | 1978 |
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 Oceana 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 Oceana County, both outside Michigan so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MI (100 bridges here).
- Ketchikan Gateway County, AK · 100 bridges
- Gunnison County, CO · 100 bridges
- Monroe County, FL · 100 bridges
- Fayette County, IN · 100 bridges
Similar average build year
Nearest mean year-built outside MI (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (64)
TAYLOR ROAD
FairOver: AUSABLE CREEK
0.25 WEST OF 34TH AVE, Oceana, MI
Built 2003 Load: 51.6 t ADT: 300
US-31 NB
FairOver: OCEANA DRIVE (OLD US-31)
1.5 MI S OF ROTHBURY, Oceana, MI
Built 1974 Load: 51.8 t ADT: 6,360
WEBSTER RD
FairOver: US-31
0.5 MI SW OF ROTHBURY, Oceana, MI
Built 1974 Load: 52.8 t ADT: 550
US-31 NB
FairOver: S BRANCH PENTWATER RIVER
3 MI NW OF HART, Oceana, MI
Built 1977 Load: 52.8 t ADT: 4,171
US 31 NB
FairOver: WAYNE ROAD
2.5 MILES NW OF HART, Oceana, MI
Built 1977 Load: 52.8 t ADT: 4,171
US-31 SB
FairOver: US-31 BR (MONROE ROAD)
4.0 MI N OF HART, Oceana, MI
Built 1977 Load: 55.1 t ADT: 4,413
N OCEANA DR(OLD31)
FairOver: CEDAR CREEK
1.5 MI N OF S JCT US-31BS, Oceana, MI
Built 1953 Load: 56.1 t ADT: 1,850
N OCEANA DR(OLD31)
FairOver: N BR PENTWATER RIVER
2.5 MI N OF S JCT US-31BS, Oceana, MI
Built 1953 Load: 56.7 t ADT: 2,200
US-31 NB
FairOver: US-31 BR POLK RD
1.5 MI W OF HART, Oceana, MI
Built 1975 Load: 57.0 t ADT: 4,806
LOOP ROAD
FairOver: NO BRANCH WHITE RIVER
0.5 MI E OF 132ND AVENUE, Oceana, MI
Built 2008 Load: 57.7 t ADT: 900
US-31 SB
FairOver: OCEANA DRIVE (OLD US-31)
1.5 MI S OF ROTHBURY, Oceana, MI
Built 1974 Load: 72.3 t ADT: 6,360
MARSHVILLE DAM RD
FairOver: STONY CREEK
0.5 MILE W OF 56TH AVE, Oceana, MI
Built 1976 Load: 97.2 t ADT: 1,000
144TH AVENUE
FairOver: S BR PENTWATER RIVER
0.058 MI S OF TYLER, Oceana, MI
Built 1963 Load: 97.2 t ADT: 790
TYLER ROAD
FairOver: HUFTILE CREEK
0.924 M E OF 88TH, Oceana, MI
Built 1958 Load: 97.2 t ADT: 2,150
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.