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.
Good-condition bridges (38)
BAULISTROL DR
GoodOver: UNNAMED DRAIN
COLLEGE FIELDS GOLF CLUB, Ingham, MI
Built 2003 Load: 28.2 t ADT: 700
OLD PLANK ROAD
GoodOver: GRAND RIVER
0.2 MI SE OF ONONDAGA, Ingham, MI
Built 2007 Load: 28.8 t ADT: 710
CESAR CHAVEZ AVE
GoodOver: GRAND RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 1929 Load: 30.8 t ADT: 5,825
AURELIUS ROAD
GoodOver: RED CEDAR RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 1972 Load: 31.1 t ADT: 9,450
HARPER ROAD
GoodOver: MUD CREEK DRAIN
2.2 M N & .5 M E OF MASON, Ingham, MI
Built 1997 Load: 32.7 t ADT: 440
KANE ROAD
GoodOver: WEST CEDAR DRAIN
4.4 MI SE OF WEBBERVILLE, Ingham, MI
Built 2002 Load: 32.7 t ADT: 220
OLDS ROAD
GoodOver: PERRY CREEK
1 M S & 2.3 M W OF LESLIE, Ingham, MI
Built 2019 Load: 32.7 t ADT: 280
GREEN ROAD
GoodOver: LOWE LAKE DRAIN
1.2 MI SE OF STOCKBRIDGE, Ingham, MI
Built 2002 Load: 32.7 t ADT: 900
TIHART ROAD
GoodOver: MUD LAKE OUTLET DRAIN
MERIDIAN TWP SEC 15, Ingham, MI
Built 1999 Load: 32.7 t ADT: 560
GALE ROAD
GoodOver: GRAND RIVER
2.7 MI NW OF ONONDAGA, Ingham, MI
Built 1998 Load: 34.0 t ADT: 375
OKEMOS ROAD
GoodOver: RED CEDAR RIVER
0.1 MI N OF S LMTS OF OKE, Ingham, MI
Built 2022 Load: 34.7 t ADT: 29,864
M-143 E MICH AVE
GoodOver: MUSEUM DRIVE
0.3 MI E OF THE CAPITOL, Ingham, MI
Built 1987 Load: 35.6 t ADT: 8,882
HULL ROAD
GoodOver: SYCAMORE CREEK
2.2 MI S OF MASON, Ingham, MI
Built 2015 Load: 35.6 t ADT: 3,835
VANATTA ROAD
GoodOver: RED CEDAR RIVER
2.8 MI SE OF OKEMOS, Ingham, MI
Built 2014 Load: 36.3 t ADT: 2,810
AURELIUS ROAD
GoodOver: GRAND TRUNK RAILROAD
IN THE CITY OF LANSING, Ingham, MI
Built 2021 Load: 36.6 t ADT: 8,715
MARSH ROAD
GoodOver: GRAND TRUNK RR
IN HASLETT, Ingham, MI
Built 1964 Load: 37.6 t ADT: 21,900
PINE TREE ROAD
GoodOver: SYCAMORE CREEK
0.6 M E & 1.9 M N OF HOLT, Ingham, MI
Built 2005 Load: 39.2 t ADT: 1,135
COLUMBIA ROAD
GoodOver: GRAND RIVER
8 MILES W OF MASON, Ingham, MI
Built 2017 Load: 41.8 t ADT: 4,300
DOBIE ROAD
GoodOver: RED CEDAR RIVER
1.5 MILES SE OF OKEMOS, Ingham, MI
Built 2010 Load: 44.4 t ADT: 12,300
WILLOUGHBY ROAD
GoodOver: SYCAMORE CREEK
2.1 MI NE OF HOLT, Ingham, MI
Built 2011 Load: 44.4 t ADT: 1,560
OLDS ROAD
GoodOver: HUNTOON LAKE EXTN DRAIN
1 M S & 0.4 M W OF LESLIE, Ingham, MI
Built 2019 Load: 45.4 t ADT: 880
US-127 SB RAMP
GoodOver: RAMP TO I-496 WB
IN LANSING, Ingham, MI
Built 2023 Load: 46.7 t ADT: 15,850
SHIAWASSEE STREET
GoodOver: GRAND RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 1996 Load: 46.7 t ADT: 5,675
ELM STREET
GoodOver: GRAND RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 2003 Load: 47.6 t ADT: 950
RAMP FROM I-496 EB
GoodOver: US-127 NB RAMP
IN LANSING, Ingham, MI
Built 2023 Load: 48.0 t ADT: 13,700
LINN ROAD
GoodOver: DEER CREEK
1.5 MI SW OF WILLIAMSTON, Ingham, MI
Built 1968 Load: 48.9 t ADT: 2,489
NOBLE ROAD
GoodOver: DOAN CREEK
2.9 MI SE OF WILLIAMSTON, Ingham, MI
Built 2014 Load: 48.9 t ADT: 535
GALE ROAD
GoodOver: WILLOW CREEK
4.1 MI NW OF ONONDAGA, Ingham, MI
Built 2014 Load: 48.9 t ADT: 313
HOWELL ROAD
GoodOver: SYCAMORE CREEK
NORTH LIMITS OF MASON, Ingham, MI
Built 2006 Load: 49.6 t ADT: 3,275
ZIMMER ROAD
GoodOver: RED CEDAR RIVER
2 MI NW OF WILLIAMSTON, Ingham, MI
Built 2013 Load: 52.5 t ADT: 1,950
WAVERLY ROAD
GoodOver: GRAND RIVER
2.5 MILES SE OF DIMONDALE, Ingham, MI
Built 1961 Load: 52.8 t ADT: 3,010
AURELIUS ROAD
GoodOver: SYCAMORE CREEK
IN THE CITY OF LANSING, Ingham, MI
Built 1978 Load: 54.4 t ADT: 5,500
N GRAND RIVER
GoodOver: GRAND RIVER
IN THE CITY OF LANSING, Ingham, MI
Built 1924 Load: 60.3 t ADT: 3,815
MILL STREET
GoodOver: HUNTOON CREEK
IN LESLIE, Ingham, MI
Built 2020 Load: 65.1 t ADT: 300
HOWELL ROAD
GoodOver: MUD CREEK
1 MILE EAST OF MASON, Ingham, MI
Built 1948 Load: 66.4 t ADT: 2,140
ZIMMER ROAD
GoodOver: DEER CREEK
4 MI N OF DANSVILLE, Ingham, MI
Built 2017 Load: 68.0 t ADT: 325
HOLT ROAD
GoodOver: DEER CREEK
3 MILES S OF WILLIAMSTON, Ingham, MI
Built 1920 Load: 74.5 t ADT: 1,192
HOWELL ROAD
GoodOver: DOAN CREEK
6 MILES SOUTH OF WILLIAMS, Ingham, MI
Built 1947 Load: 88.1 t ADT: 1,522
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.