Total bridges
216
Public highway bridges in Clinton County
County profile · official public datasets
Clinton County, MI
216 public highway bridges tracked in the FHWA National Bridge Inventory: 14.8% rated Good, 69.4% Fair, 15.7% Poor.
- 216
- Public bridges
- 14.8%
- Good condition
- 15.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Clinton County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 61st
- of 83 on Poor share
- 15.7%
- Poor-condition share
- 216
- public highway bridges
- 1975
- 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.
Clinton County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Clinton County ranks #61 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.7%). Clinton County, Michigan contains 216 public highway bridges. Roughly 14.8% are rated “Good,” 69.4% “Fair,” and 15.7% “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
14.8%
32 of 216 rated 7-9
Fair condition
69.4%
150 of 216 rated 5-6
Poor condition
15.7%
34 of 216 rated 4 or below
In-state Poor-share rank
#61 of 83
Among Michigan counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 216 NBI-tracked bridges by lowest applicable component rating.
Good 14.8% (32)
Fair 69.4% (150)
Poor 15.7% (34)
Clinton County's Poor-condition bridges carry 23,252 vehicle crossings a day
That is 2% of the county's reported daily bridge traffic on 15.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 684 crossings a day against 2,889 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 216 of 216 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
37.5% of Clinton County's bridges have passed the 50-year mark
81 of the 216 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 14.8% 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 18.1% of the county's Poor-condition bridge traffic
CLARK RD over BR OF LOOKING GLASS RIVR, built 1963, carries 4,198 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 34-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 23,252 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Clinton County's bridges were built
216 bridges with a recorded construction year, grouped by decade
- pre-1900 1
Built before 1900
1 bridges
- 1900s 1
1900–1909
1 bridges
- 1910s 5
1910–1919
5 bridges
- 1920s
1920–1929
27 bridges
- 1930s 2
1930–1939
2 bridges
- 1940s 5
1940–1949
5 bridges
- 1950s 8
1950–1959
8 bridges
- 1960s 18
1960–1969
18 bridges
- 1970s 18
1970–1979
18 bridges
- 1980s
1980–1989
52 bridges
- 1990s
1990–1999
44 bridges
- 2000s 20
2000–2009
20 bridges
- 2010s 14
2010–2019
14 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1980s, when 52 of the county's bridges still in the inventory were built, which is 24.1% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1975) matches the Michigan average (1976).
How Clinton County compares with Michigan's closest counties by inventory size
The 5 Michigan counties nearest Clinton County in number of bridges, with their condition splits. Its 15.7% Poor share is the 5th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1976 is in line with the group.
Showing the 5 closest of 82 Michigan counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Ingham County | 241 | 15.8% | 68.9% | 15.4% | 1972 |
| Lenawee County | 225 | 47.6% | 39.6% | 12.9% | 1981 |
| Clinton County (this page) | 216 | 14.8% | 69.4% | 15.7% | 1975 |
| Calhoun County | 213 | 18.3% | 63.4% | 18.3% | 1971 |
| Eaton County | 200 | 30% | 63.5% | 6.5% | 1978 |
| Huron County | 192 | 31.8% | 62% | 6.3% | 1976 |
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 Clinton 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 Clinton County, both outside Michigan so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MI (216 bridges here).
- Coffee County, AL · 216 bridges
- Miller County, AR · 216 bridges
- Ascension County, LA · 216 bridges
- Choctaw County, OK · 216 bridges
Similar average build year
Nearest mean year-built outside MI (1975 here).
- San Bernardino County, CA · avg 1975 · 1,422 bridges
- Lane County, OR · avg 1975 · 1,010 bridges
- Fulton County, GA · avg 1975 · 775 bridges
- Westmoreland County, PA · avg 1975 · 620 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (216)
US-127 SB OFF RAMP
FairOver: FRED MEIJER STATE TRAIL
0.5 MI N OF M-21, Clinton, MI
Built 1993 Load: 41.5 t ADT: 500
WACOUSTA ROAD
FairOver: PEET CREEK
0.3 MI S OF STONE RD, Clinton, MI
Built 2007 Load: 41.5 t ADT: 441
WILDCAT ROAD
FairOver: ALDER CREEK
0.1 MI W OF HOLLISTER RD, Clinton, MI
Built 1926 Load: 41.5 t ADT: 143
STATE RD
FairOver: US-127
1 MI N OF INGHAM CO LINE, Clinton, MI
Built 1971 Load: 41.8 t ADT: 3,300
WEBSTER RD
FairOver: I-69
2.6 MI N OF EAST LANSING, Clinton, MI
Built 1985 Load: 42.1 t ADT: 27,400
N MAPLE STREET
FairOver: MAPLE RIVER
IN MAPLE RAPIDS, Clinton, MI
Built 1980 Load: 43.7 t ADT: 2,890
STATE ROAD
FairOver: GRAND RIVER
0.1 MI E OF GRANGE RD, Clinton, MI
Built 1979 Load: 44.4 t ADT: 875
I-69BR EB RAMP D
FairOver: I-69
3 MI NE OF EAST LANSING, Clinton, MI
Built 1985 Load: 45.0 t ADT: 8,945
I-69BR WB RAMP C
FairOver: I-69
3.5 MI NE OF EAST LANSING, Clinton, MI
Built 1985 Load: 45.0 t ADT: 8,945
EB TURNING RDWY
FairOver: I-96
7 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 46.3 t ADT: 4,225
BAUER ROAD
FairOver: LOOKING GLASS RIVER
0.5 MI N OF CLARK RD, Clinton, MI
Built 2000 Load: 46.3 t ADT: 298
I-69 WB
FairOver: US-127 SB&NB US-127 C-D
2.6 MI N OF EAST LANSING, Clinton, MI
Built 1985 Load: 46.7 t ADT: 18,989
CHANDLER ROAD
FairOver: I-69
2.3 MI N OF EAST LANSING, Clinton, MI
Built 1985 Load: 47.6 t ADT: 4,521
I-69 EB
FairOver: PEACOCK ROAD
0.5 MI W OF COUNTY LINE, Clinton, MI
Built 1989 Load: 47.6 t ADT: 17,652
I-96 WB
FairOver: I-96 BL
AT I-96 BL, Clinton, MI
Built 1962 Load: 48.3 t ADT: 18,210
I-96 EB
FairOver: I-96 BL
AT I-96 BL, Clinton, MI
Built 1962 Load: 48.6 t ADT: 18,210
WB I-69 C-D
FairOver: US-127 SB&NB US-127 C-D
2.6 MI N OF EAST LANSING, Clinton, MI
Built 1985 Load: 48.6 t ADT: 8,647
DEWITT RD
FairOver: I-69
0.6 MI SE OF DEWITT, Clinton, MI
Built 1980 Load: 48.6 t ADT: 70
WRIGHT ROAD
FairOver: LOOKING GLASS RIVER
1/2 MI N OF CLARK RD, Clinton, MI
Built 1996 Load: 49.2 t ADT: 3,658
AIRPORT ROAD
FairOver: I-69
4.0 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 50.2 t ADT: 4,494
I-69 SB
FairOver: I-96
7 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 50.9 t ADT: 10,340
I-69 EB
FairOver: US-127 SB&NB US-127 C-D
2.6 MI N OF EAST LANSING, Clinton, MI
Built 1985 Load: 51.8 t ADT: 18,989
LOWELL RD
FairOver: I-69
5.5 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 51.8 t ADT: 210
I-69 WB
FairOver: TURNER RD
1.2 MI S OF DEWITT, Clinton, MI
Built 1980 Load: 52.8 t ADT: 18,999
I-69 EB
FairOver: TURNER RD
1.2 MI S OF DEWITT, Clinton, MI
Built 1980 Load: 52.8 t ADT: 18,999
M-21
FairOver: ALDER CREEK
1.2 MI W OF OVID, Clinton, MI
Built 1949 Load: 52.8 t ADT: 7,103
I-96 BL(GRAND RIV)
FairOver: CSX RR
AT EATON CO LINE, Clinton, MI
Built 1938 Load: 53.8 t ADT: 10,600
I-69 NB
FairOver: I-96BL GRAND RIVER AVE
5 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 55.1 t ADT: 9,915
I-69 SB
FairOver: EB TURNING ROADWAY
6.0 M NW OF LANSING, Clinton, MI
Built 1981 Load: 55.4 t ADT: 10,507
I-69 SB
FairOver: I-96BL GRAND RIVER AVE
5 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 56.7 t ADT: 10,340
AIRPORT ROAD
FairOver: LOOKING GLASS RIVER
BETWEEN HERBISON RDS, Clinton, MI
Built 1993 Load: 56.7 t ADT: 4,115
BRIDGE STREET
FairOver: LOOKING GLASS RIVER
0.8 MI N OF S CITY LIMITS, Clinton, MI
Built 1993 Load: 56.7 t ADT: 3,900
LOWELL RD
FairOver: BAD CREEK
0.1 MI S OF CENTERLINE RD, Clinton, MI
Built 2007 Load: 58.0 t ADT: 97
MAIN STREET
FairOver: MAPLE RIVER
IN OVID, Clinton, MI
Built 2001 Load: 59.0 t ADT: 7,892
ISLAND ROAD
FairOver: COX DRAIN
0.1 W OF FOREST HILL RD, Clinton, MI
Built 1981 Load: 59.3 t ADT: 180
I-69 NB
FairOver: EB TURNING ROADWAY
6.0 MI NW OF LANSING, Clinton, MI
Built 1981 Load: 59.6 t ADT: 9,915
M-21
FairOver: MAPLE RIVER
IN OVID, Clinton, MI
Built 1997 Load: 60.6 t ADT: 6,505
DEWITT ROAD
FairOver: SPAULDING DRAIN
1/2 MI N OF TAFT RD, Clinton, MI
Built 2011 Load: 61.6 t ADT: 1,823
WACOUSTA ROAD
FairOver: COX DRAIN (BROWNS CR)
1/4 MI S OF ISLAND RD, Clinton, MI
Built 1991 Load: 63.5 t ADT: 441
US-127 NB
FairOver: FERDUN CREEK
0.3 MI S OF GRATIOT COL, Clinton, MI
Built 1957 Load: 66.1 t ADT: 88,500
DEXTER TRAIL
FairOver: FULLER CREEK
0.2 E OF GRANGE RD, Clinton, MI
Built 2008 Load: 66.1 t ADT: 92
TALLMAN ROAD
FairOver: STONY CREEK
0.1 MI S OF PARKS RD, Clinton, MI
Built 1999 Load: 70.0 t ADT: 87
MONROE ROAD
FairOver: LOOKING GLASS RIVER
0.3 MI N OF HOWE RD, Clinton, MI
Built 2001 Load: 72.6 t ADT: 200
GRATIOT RD
FairOver: FIFIELD CREEK
0.6 W OF JONES RD, Clinton, MI
Built 1979 Load: 80.4 t ADT: 380
US-127 SB
FairOver: FERDUN CREEK
0.3 MI S OF GRATIOT COL, Clinton, MI
Built 1956 Load: 81.6 t ADT: 9,785
I-96
FairOver: HUSTED & LANDENBURG DRN
0.5 MI WEST OF M-100, Clinton, MI
Built 1957 Load: 90.1 t ADT: 38,938
JASON ROAD
FairOver: CEDAR LAKE DRAIN
0.1 MI E OF SHEPARDSVILLE, Clinton, MI
Built 1982 Load: 96.9 t ADT: 133
I-69
FairOver: CHANDLER DRAIN
0.2 MILES NORTH OF CLARK, Clinton, MI
Built 1973 Load: 97.2 t ADT: 37,978
I-69
FairOver: CHANDLER DRAIN
0.1 MILE NW OF WOOD ST, Clinton, MI
Built 1973 Load: 97.2 t ADT: 37,978
I-69
FairOver: WATSON & SUMMERS DRAIN
0.2 MI WEST OF LOWELL RD, Clinton, MI
Built 1980 Load: 97.2 t ADT: 28,930
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.