State profile · Above median Poor share

Michigan bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in Michigan.

11,371
Public bridges
33.7%
Good condition
11.3%
Poor condition

Michigan holds 11,371 public highway bridges (#25 of 52 by inventory) with a 11.27% Poor share (#9 of 52 by Poor share).

That is 11.3% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 44 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

11,371

Public highway bridges in Michigan

Good Condition

33.7%

3,836 bridges rated 7-9

-16.3pp vs 50% benchmark

Poor Condition

11.3%

1,281 bridges whose lowest applicable component is rated 0-4

3.8pp vs national avg 7.5%

Michigan vs national bridge condition

Michigan - Good condition share 33.7%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Michigan - Poor-condition share 37.6%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

Michigan in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: Michigan has 11,371 bridges and a 11.3% Poor-condition share in the 2024 NBI, rank #44 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: Michigan has 11,371 bridges and a 11.3% Poor-condition share in the 2024 NBI, rank #44 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

Michigan vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

11,371 25th of 54 higher than 29 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for Michigan

The highlighted point is Michigan: 11,371 bridges and 11.27% in Poor condition, rank #44 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below Michigan on that same Poor-share ordering:

  • New York: 17,642 bridges · 9.43% Poor
  • North Dakota: 4,255 bridges · 10.98% Poor
  • Michigan: 11,371 bridges · 11.27% Poor
  • Louisiana: 12,698 bridges · 11.48% Poor
  • Pennsylvania: 23,299 bridges · 12.58% Poor

The full national sortable table lives on the rankings page.

Material families in Michigan

Exclusive FHWA material families across all 11,371 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains Michigan’s inventory

State agency holds 40.0% of the 11,371 public highway bridges filed under Michigan in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When Michigan’s bridges were built

Pre-1950 construction accounts for 13.1% of the 11,371 bridges with a recorded original year in Michigan. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

Michigan33.7%55%11.3%GoodFairPoor
Bridge inventory deck-condition mix - Michigan (FHWA NBI)

Counties (83)

Alcona 27 Alger 53 Allegan 244 Alpena 32 Antrim 15 Arenac 80 Baraga 68 Barry 69 Bay 166 Benzie 25 Berrien 272 Branch 118 Calhoun 213 Cass 52 Charlevoix 18 Cheboygan 73 Chippewa 112 Clare 96 Clinton 216 Crawford 54 Delta 84 Dickinson 37 Eaton 200 Emmet 37 Genesee 371 Gladwin 63 Gogebic 104 Grand Traverse 33 Gratiot 167 Hillsdale 105 Houghton 58 Huron 192 Ingham 241 Ionia 119 Iosco 47 Iron 54 Isabella 183 Jackson 158 Kalamazoo 151 Kalkaska 15 Kent 523 Keweenaw 12 Lake 30 Lapeer 163 Leelanau 8 Lenawee 225 Livingston 165 Luce 28 Mackinac 63 Macomb 417 Manistee 35 Marquette 147 Mason 66 Mecosta 80 Menominee 96 Midland 139 Missaukee 39 Monroe 297 Montcalm 121 Montmorency 21 Muskegon 144 Newaygo 65 Oakland 508 Oceana 100 Ogemaw 31 Ontonagon 64 Osceola 103 Oscoda 15 Otsego 25 Ottawa 254 Presque Isle 37 Roscommon 43 Saginaw 315 Sanilac 171 Schoolcraft 54 Shiawassee 163 St. Clair 327 St. Joseph 132 Tuscola 242 Van Buren 129 Washtenaw 262 Wayne 1026 Wexford 64

Michigan vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Michigan on the same metric.

NY

New York

9.43% top marginal rate
Structure
Progressive
Burden @ $100K
$17,642

ND

North Dakota

10.98% top marginal rate
Structure
Progressive
Burden @ $100K
$4,255
Selected

MI

Michigan

11.27% top marginal rate
Structure
Progressive
Burden @ $100K
$11,371

LA

Louisiana

11.48% top marginal rate
Structure
Progressive
Burden @ $100K
$12,698

PA

Pennsylvania

12.58% top marginal rate
Structure
Progressive
Burden @ $100K
$23,299

Bridges Needing Most Attention in Michigan

Six lowest-condition bridges in Michigan, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

WOODLAND ROAD

Poor

Over: AU TRAIN RIVER

0.75 MI E OF AU TRAIN, Alger, MI

Built 1910 Load: 0.0 t

HAZE ROAD

Poor

Over: BETSIE RIVER

1 MI W OF THOMPSONVILLE, Benzie, MI

Built 1900 Load: 0.0 t ADT: 32

BRINK ROAD

Poor

Over: HOG CREEK DRAIN #40

BRONSON TWP SEC 28, Branch, MI

Built 1905 Load: 0.0 t ADT: 111

GOWER ROAD

Poor

Over: COLDWATER RIVER

UNION TWP SEC 10-15, Branch, MI

Built 1900 Load: 0.0 t ADT: 111

DEXTER TRAIL

Poor

Over: MUSKRAT CREEK

0.2 MI N OF CENTERLINE RD, Clinton, MI

Built 1980 Load: 0.0 t ADT: 136

COPPS MINE ROAD

Poor

Over: PRESQUE ISLE RIVER

SEC 28 MARENISCO TWP, Gogebic, MI

Built 1906 Load: 0.0 t ADT: 10

All Bridges in Michigan

I-75 NB

Fair

Over: CLINTONVILLE RD

4.1MI SE OF M-15, Oakland, MI

Built 1962 Load: 46.0 t ADT: 42,870

I-75 SB

Fair

Over: CLINTONVILLE RD

4.1 MI SE OF M-15, Oakland, MI

Built 1962 Load: 46.0 t ADT: 42,870

8 MILE RD

Fair

Over: ROUGE RIVER

BET GRAND RIVER AND MIDDL, Oakland, MI

Built 1966 Load: 46.0 t ADT: 20,809

US-31 SB

Fair

Over: HART-MONTAGUE TRAIL

2.5 MI S OF ROTHBURY, Oceana, MI

Built 1974 Load: 46.0 t ADT: 6,360

US-31 NB

Fair

Over: HART-MONTAGUE TRAIL

2.5 MI S OF ROTHBURY, Oceana, MI

Built 1974 Load: 46.0 t ADT: 6,360

WINSTON RD

Fair

Over: US-31

1 MI W OF ROTHBURY, Oceana, MI

Built 1973 Load: 46.0 t ADT: 2,500

FRUITPORT ROAD

Fair

Over: PETTYS BAYOU

0.60 MI N OF STATE, Ottawa, MI

Built 1948 Load: 46.0 t ADT: 4,445

I-75 SB

Fair

Over: CASS RIVER

10.0 MI NW OF GENESEE CO, Saginaw, MI

Built 1961 Load: 46.0 t ADT: 25,971

STATE ROAD

Fair

Over: TITTABAWASSEE RIVER

0.9 MI E OF RIVER ROAD, Saginaw, MI

Built 1979 Load: 46.0 t ADT: 10,588

FREELAND ROAD

Fair

Over: TITTABAWASSEE RIV OVRFLW

0.3 MI E OF RIVER ROAD, Saginaw, MI

Built 1931 Load: 46.0 t ADT: 9,899

ROOSEVELT ROAD

Fair

Over: BEAVER CREEK

0.7 MI E OF MERIDIAN ROAD, Saginaw, MI

Built 1974 Load: 46.0 t ADT: 51

M-25

Fair

Over: BIG CREEK

7.6 MI N OF M46, Sanilac, MI

Built 1934 Load: 46.0 t ADT: 1,173

NEW LOTHROP RD

Fair

Over: ONION CREEK

0.4 MI S OF NEW LOTHROP, Shiawassee, MI

Built 1998 Load: 46.0 t ADT: 763

NAPIER ROAD

Fair

Over: M-14

3 MI W OF PLYMOUTH, Wayne, MI

Built 1975 Load: 46.0 t ADT: 65,500

SCHOOLCRAFT CONN

Fair

Over: M-14

1 MI W OF W CTY LTS LIVON, Wayne, MI

Built 1977 Load: 46.0 t ADT: 92,000

RMP I-96E TO I-75N

Fair

Over: I-75 NB AND EXIT RAMP

IN DETROIT, Wayne, MI

Built 1970 Load: 46.0 t ADT: 10,290

MADISON AVE RAMPS

Fair

Over: I-375

IN DETROIT, Wayne, MI

Built 1964 Load: 46.0 t ADT: 3,784

CARPENTER AVE

Fair

Over: I-75

IN HAMTRAMCK, Wayne, MI

Built 1969 Load: 46.0 t ADT: 15,976

BECK ROAD

Fair

Over: FOWLER CREEK

CANTON N/GEDDES, Wayne, MI

Built 1967 Load: 46.0 t ADT: 1,393

BEECH-DALY ROAD

Fair

Over: ECORSE CREEK

IN DEARBORN HEIGHTS, Wayne, MI

Built 1986 Load: 46.0 t ADT: 9,000

KNAPP STREET

Fair

Over: GRAND RIVER

0.15 MI E OF GRND RIV DRV, Kent, MI

Built 1966 Load: 46.2 t ADT: 14,445

MINER ROAD

Fair

Over: FISH CREEK

0.25 MI S HOLLAND LK RD, Montcalm, MI

Built 1994 Load: 46.2 t ADT: 91

CR 687

Fair

Over: PAW PAW RIVER

0.5 MI N OF HARTFORD, Van Buren, MI

Built 1981 Load: 46.2 t ADT: 1,895

BEAVER LAKE ROAD

Fair

Over: LWR S BR THUNDER BAY RIV

BETW SEC 3&10 T29N R7E, Alpena, MI

Built 2001 Load: 46.3 t ADT: 250

I-75 NB

Fair

Over: S BR PINE RIVER

5.5 MI SW OF STANDISH, Arenac, MI

Built 1968 Load: 46.3 t ADT: 13,735

M-138

Fair

Over: QUANICASSEE RIVER

2.7 MI E OF MUNGER, Bay, MI

Built 1968 Load: 46.3 t ADT: 1,305

MACKINAW ROAD

Fair

Over: N BR OF KAWKAWLIN RIVER

0.25 MI S OF RIVER RD, Bay, MI

Built 1989 Load: 46.3 t ADT: 1,403

I-69 SB

Fair

Over: I-94

@ I-94, Calhoun, MI

Built 1968 Load: 46.3 t ADT: 7,500

M-68 M-33

Fair

Over: MILLIGAN CREEK

3.3 MI W OF TOWER, Cheboygan, MI

Built 1958 Load: 46.3 t ADT: 3,521

US-10 EB

Fair

Over: M-115

3.5 MI NW OF FARWELL, Clare, MI

Built 1973 Load: 46.3 t ADT: 3,250

TOBACCO DRIVE

Fair

Over: S BR TOBACCO RIVER

SHERIDAN TWP SEC 22, Clare, MI

Built 1959 Load: 46.3 t ADT: 800

EB TURNING RDWY

Fair

Over: I-96

7 MI NW OF LANSING, Clinton, MI

Built 1981 Load: 46.3 t ADT: 4,225

BAUER ROAD

Fair

Over: LOOKING GLASS RIVER

0.5 MI N OF CLARK RD, Clinton, MI

Built 2000 Load: 46.3 t ADT: 298

M-99 NB

Fair

Over: SKINNER DRAIN

1.5 MI S OF HOLT RD, Eaton, MI

Built 1978 Load: 46.3 t ADT: 4,238

M-99 SB

Fair

Over: SKINNER DRAIN

1.5 MI S OF HOLT RD, Eaton, MI

Built 1978 Load: 46.3 t ADT: 4,238

I-69 WB

Fair

Over: GTW RR &SWARTZ CREEK

E OF MILLER @ SWARTZ CRK, Genesee, MI

Built 1968 Load: 46.3 t ADT: 19,829

I-69 EB

Fair

Over: IRISH RD

4.0 MI E OF FLINT, Genesee, MI

Built 1970 Load: 46.3 t ADT: 23,125

US-2 BR

Fair

Over: MONTREAL RIVER

IN IRONWOOD, Gogebic, MI

Built 1964 Load: 46.3 t ADT: 7,161

ST JOSEPH-MAIN ST

Fair

Over: I-496

W LTS OF LANSING, Ingham, MI

Built 1969 Load: 46.3 t ADT: 2,850

M-43

Fair

Over: DOAN CREEK

2.2 MI E OF WILLIAMSTON, Ingham, MI

Built 2000 Load: 46.3 t ADT: 5,289

M-57

Fair

Over: WHITE PINE TRAIL(RR ABN)

3.0 MI S OF CEDAR SPRINGS, Kent, MI

Built 1969 Load: 46.3 t ADT: 16,071

STATE STREET

Fair

Over: MDOT RR CORRIDOR

IN HOWELL, Livingston, MI

Built 1987 Load: 46.3 t ADT: 2,300

TOMA ROAD

Fair

Over: PORTAGE RIVER

SEC 34-35 PUTNAM TWP, Livingston, MI

Built 1978 Load: 46.3 t ADT: 200

M-53 SB

Fair

Over: UTICA RD

1.9 MI S OF M-59, Macomb, MI

Built 1963 Load: 46.3 t ADT: 26,797

M-53 NB

Fair

Over: UTICA RD

1.9 MI S OF M-59, Macomb, MI

Built 1966 Load: 46.3 t ADT: 26,797

10.5 MI ROAD

Fair

Over: MND RD &RMPS A&B O I-696

CITY OF WARREN, Macomb, MI

Built 1977 Load: 46.3 t ADT: 11,996

SB SERVICE RD

Fair

Over: RAMPS A&F OFF I-696

CITY OF WARREN, Macomb, MI

Built 1976 Load: 46.3 t ADT: 1,200

RAMPS E&F

Fair

Over: MOUND &SER.RDS OV I-696

CITY OF WARREN, Macomb, MI

Built 1976 Load: 46.3 t ADT: 10,620

CASS AVE

Fair

Over: NORTH BRANCH CLINTON RIV

0.25 MI WEST OF MORAVIAN, Macomb, MI

Built 1976 Load: 46.3 t ADT: 30,901

UTICA RD

Fair

Over: RED RUN DRAIN

0.1 MI SOUTH OF HAYES RD, Macomb, MI

Built 1985 Load: 46.3 t ADT: 17,850

Showing 4,701-4,750 of 11,371 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.

What to do with this

Use Michigan's inventory picture to drill to a county or a specific span.

  • Browse counties in Michigan and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Michigan Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.