Total bridges
241
Public highway bridges in Ingham County
County profile · official public datasets
Ingham County, MI
241 public highway bridges tracked in the FHWA National Bridge Inventory: 15.8% rated Good, 68.9% Fair, 15.4% Poor.
- 241
- Public bridges
- 15.8%
- Good condition
- 15.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Ingham County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 56th
- of 83 on Poor share
- 15.4%
- Poor-condition share
- 241
- public highway bridges
- 1972
- 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.
Ingham County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Ingham County ranks #56 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.4%). Ingham County, Michigan contains 241 public highway bridges. Roughly 15.8% are rated “Good,” 68.9% “Fair,” and 15.4% “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
15.8%
38 of 241 rated 7-9
Fair condition
68.9%
166 of 241 rated 5-6
Poor condition
15.4%
37 of 241 rated 4 or below
In-state Poor-share rank
#56 of 83
Among Michigan counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 241 NBI-tracked bridges by lowest applicable component rating.
Good 15.8% (38)
Fair 68.9% (166)
Poor 15.4% (37)
Ingham County's Poor-condition bridges carry 499,378 vehicle crossings a day
That is 13.5% of the county's reported daily bridge traffic on 15.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 13,497 crossings a day against 4,689 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 241 of 241 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
70.1% of Ingham County's bridges have passed the 50-year mark
169 of the 241 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 15.8% 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 7% of the county's Poor-condition bridge traffic
I-496 EB over RED CEDAR RIVER & RAMP V, built 1970, carries 34,831 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 37-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 499,378 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Ingham County's bridges were built
241 bridges with a recorded construction year, grouped by decade
- 1910s 2
1910–1919
2 bridges
- 1920s 9
1920–1929
9 bridges
- 1930s 5
1930–1939
5 bridges
- 1940s 12
1940–1949
12 bridges
- 1950s 12
1950–1959
12 bridges
- 1960s
1960–1969
99 bridges
- 1970s
1970–1979
41 bridges
- 1980s 9
1980–1989
9 bridges
- 1990s 8
1990–1999
8 bridges
- 2000s 26
2000–2009
26 bridges
- 2010s 13
2010–2019
13 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1960s, when 99 of the county's bridges still in the inventory were built, which is 41.1% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1972) matches the Michigan average (1976).
How Ingham County compares with Michigan's closest counties by inventory size
The 5 Michigan counties nearest Ingham County in number of bridges, with their condition splits. Its 15.4% Poor share is the 4th-lowest of these 6. Its average build year of 1972 against a peer-group mean of 1978 is 6 years older.
Showing the 5 closest of 82 Michigan counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Washtenaw County | 262 | 23.3% | 56.5% | 20.2% | 1975 |
| Ottawa County | 254 | 40.9% | 52.8% | 6.3% | 1977 |
| Allegan County | 244 | 24.2% | 59% | 16.8% | 1978 |
| Tuscola County | 242 | 33.9% | 61.2% | 5% | 1980 |
| Ingham County (this page) | 241 | 15.8% | 68.9% | 15.4% | 1972 |
| Lenawee County | 225 | 47.6% | 39.6% | 12.9% | 1981 |
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 Ingham 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 Ingham County, both outside Michigan so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MI (241 bridges here).
- Sumter County, AL · 241 bridges
- Hardin County, IA · 241 bridges
- Iowa County, IA · 241 bridges
- Barber County, KS · 241 bridges
Similar average build year
Nearest mean year-built outside MI (1972 here).
- Santa Clara County, CA · avg 1972 · 964 bridges
- Madison County, AL · avg 1972 · 710 bridges
- Kern County, CA · avg 1972 · 668 bridges
- York County, PA · avg 1972 · 569 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (166)
ELM STREET
FairOver: SYCAMORE CREEK
IN THE CITY OF MASON, Ingham, MI
Built 1947 Load: 9.1 t ADT: 250
I-496 EB
FairOver: GR RIV I-96 BL RIVER ST
IN LANSING, Ingham, MI
Built 2000 Load: 12.6 t ADT: 32,900
KINNEVILLE ROAD
FairOver: GRAND RIVER
2 MI NW OF ONONDAGA, Ingham, MI
Built 1952 Load: 14.2 t ADT: 1,230
I-496WB & US-127NB
FairOver: I-96 WB
I-96 & I-496/US127 INTRCH, Ingham, MI
Built 1963 Load: 17.5 t ADT: 20,400
ALLEN ROAD
FairOver: WOLF CREEK
1.4 MI NE OF WEBBERVILLE, Ingham, MI
Built 1968 Load: 19.1 t ADT: 1,400
CLARK ROAD
FairOver: DEER CREEK
3.75 MI NW OF DANSVILLE, Ingham, MI
Built 1941 Load: 21.1 t ADT: 175
PUTNAM STREET
FairOver: RED CEDAR RIVER
IN WILLIAMSTON, Ingham, MI
Built 2005 Load: 21.7 t ADT: 8,000
GRAMER ROAD
FairOver: RED CEDAR RIVER
2 MI NE OF WEBBERVILLE, Ingham, MI
Built 1954 Load: 23.0 t ADT: 1,851
ONONDAGA RD
FairOver: NORTH ONONDAGA DRAIN
0.4 MI N OF FERRIS RD, Ingham, MI
Built 1971 Load: 23.3 t ADT: 1,600
WALLACE RD
FairOver: I-96
@ LIVINGSTON CO LINE, Ingham, MI
Built 1962 Load: 23.7 t ADT: 1,250
US-127 SB
FairOver: VINE ST
IN LANSING (VINE ST), Ingham, MI
Built 1970 Load: 23.7 t ADT: 33,225
WEST SERVICE ROAD
FairOver: SYCAMORE CREEK
2.5 M S & .4 M W OF MASON, Ingham, MI
Built 1956 Load: 23.7 t ADT: 410
FITCHBURG ROAD
FairOver: CAHAOGAN CREEK
0.5 MI W OF FITCHBURG, Ingham, MI
Built 1956 Load: 24.0 t ADT: 400
CAVANAUGH ROAD
FairOver: SYCAMORE CREEK
IN THE CITY OF LANSING, Ingham, MI
Built 1990 Load: 24.9 t ADT: 4,000
ENTERPRISE DRIVE
FairOver: PAWLOWSKI CREEK DRAIN
0.3 MI W OF AURELIUS RD, Ingham, MI
Built 1978 Load: 25.3 t ADT: 4,525
US-127 NB
FairOver: SYCAMORE CREEK
2.7 MI N OF M-36, Ingham, MI
Built 1966 Load: 26.2 t ADT: 13,964
JEFFERSON STREET
FairOver: SYCAMORE CREEK
IN THE CITY OF MASON, Ingham, MI
Built 1975 Load: 28.2 t ADT: 5,795
HOLT ROAD
FairOver: SYCAMORE CREEK
1 MILE EAST OF HOLT, Ingham, MI
Built 1965 Load: 28.5 t ADT: 6,600
M-99 (MLK AVE SB)
FairOver: I-496
IN LANSING, Ingham, MI
Built 1970 Load: 28.8 t ADT: 32,920
OKEMOS ROAD
FairOver: MUD CREEK
2 MILES N OF MASON, Ingham, MI
Built 1953 Load: 28.8 t ADT: 4,660
GRAND AVE
FairOver: I-496
IN LANSING, Ingham, MI
Built 1968 Load: 29.5 t ADT: 17,200
BASE LINE ROAD
FairOver: CAHAOGAN CREEK
1.1 MI SW OF FITCHBURG, Ingham, MI
Built 1944 Load: 29.5 t ADT: 610
MT HOPE AVENUE
FairOver: SYCAMORE CREEK
IN THE CITY OF LANSING, Ingham, MI
Built 1962 Load: 29.5 t ADT: 8,725
SOUTH STREET
FairOver: US-127
IN MASON, Ingham, MI
Built 1967 Load: 29.8 t ADT: 700
FITCHBURG ROAD
FairOver: BATTEESE CREEK
5 MILES EAST OF LESLIE, Ingham, MI
Built 1931 Load: 30.5 t ADT: 560
I-496 WB
FairOver: FOREST RD
IN LANSING (FOREST RD), Ingham, MI
Built 1963 Load: 30.8 t ADT: 28,350
WAVERLY ROAD
FairOver: GRAND RIVER
0.25 MI S OF M-78 & US-27, Ingham, MI
Built 1984 Load: 30.8 t ADT: 25,678
CAPITOL AVE
FairOver: I-496
IN LANSING, Ingham, MI
Built 1968 Load: 31.1 t ADT: 17,200
MERIDIAN RD
FairOver: I-96
6.9 MI E OF I-496, Ingham, MI
Built 1962 Load: 31.1 t ADT: 3,650
ELM RD
FairOver: I-96
1.2 MI E OF M-52, Ingham, MI
Built 1962 Load: 31.4 t ADT: 1,250
COLUMBIA ROAD
FairOver: DOAN CREEK
2 MI NE OF DANSVILLE, Ingham, MI
Built 1945 Load: 31.4 t ADT: 164
COLUMBIA RD
FairOver: US-127
IN MASON, Ingham, MI
Built 1966 Load: 31.8 t ADT: 5,327
US-27 BR
FairOver: CSX RR & WB I-96BR
IN LANSING, Ingham, MI
Built 1960 Load: 31.8 t ADT: 20,482
I-496 EB
FairOver: US-127 RAMP SB
RAMP TO TROWBRIDGE RD, Ingham, MI
Built 1970 Load: 32.1 t ADT: 33,453
WAVERLY ROAD
FairOver: GRAND RIVER
0.9 MILES N OF M-43, Ingham, MI
Built 1941 Load: 32.1 t ADT: 15,000
US-127 NB
FairOver: VINE ST
IN LANSING (VINE ST), Ingham, MI
Built 1970 Load: 32.4 t ADT: 32,700
KIPP ROAD
FairOver: WILLOW CREEK
2.5 MI SW OF MASON, Ingham, MI
Built 1984 Load: 32.4 t ADT: 1,150
BROWN ROAD
FairOver: DEER CREEK
2 MI NW OF DANSVILLE, Ingham, MI
Built 1986 Load: 32.4 t ADT: 100
M-43 EB (SAGINAW)
FairOver: GRAND RIVER
IN LANSING (SAGINAW ST), Ingham, MI
Built 2012 Load: 32.7 t ADT: 18,900
M-43
FairOver: LAKE LANSING OUTLET
0.2 MI E OF PARK LAKE RD, Ingham, MI
Built 1931 Load: 32.7 t ADT: 27,408
DIETZ RD
FairOver: I-96
1.6 MI W OF M-43 & M-52, Ingham, MI
Built 1961 Load: 32.7 t ADT: 950
COLUMBIA ROAD
FairOver: DEER CREEK
2.6 MI NW OF DANSVILLE, Ingham, MI
Built 2002 Load: 32.7 t ADT: 350
MOYER ROAD
FairOver: WOLF CREEK
1.7 MI SW OF BELL OAK, Ingham, MI
Built 1983 Load: 32.7 t ADT: 130
PENNSYLVANIA AVE
FairOver: RED CEDAR RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 1963 Load: 32.7 t ADT: 17,675
I-496 WB
FairOver: GR RIV I-96 BL RIVER ST
IN LANSING, Ingham, MI
Built 2000 Load: 32.7 t ADT: 32,900
WILLIAMSTON RD
FairOver: I-96
4.4 MI W OF M-43 & M-52, Ingham, MI
Built 1962 Load: 33.4 t ADT: 3,375
I-96 EB
FairOver: M-99
@ M-99, Ingham, MI
Built 1962 Load: 33.7 t ADT: 22,051
I-496WB & US-127NB
FairOver: I-96 EB
I-96 & I-496/US127 INTRCH, Ingham, MI
Built 1963 Load: 33.7 t ADT: 20,400
I-496 EB
FairOver: MOUNT HOPE AVE
SE LTS OF LANSING (MT HOP, Ingham, MI
Built 1963 Load: 34.3 t ADT: 28,330
I-496 WB
FairOver: MOUNT HOPE RD
SE LTS OF LANSING (MT HOP, Ingham, MI
Built 1963 Load: 34.3 t ADT: 28,350
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.