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-69 NB

Fair

Over: I-94

@ I-94, Calhoun, MI

Built 1968 Load: 36.0 t ADT: 12,184

I-75 BS (ASHMUN)

Fair

Over: POWER CANAL

IN SAULT STE MARIE, Chippewa, MI

Built 1934 Load: 36.0 t ADT: 10,180

GOGOMAIN ROAD

Fair

Over: GOGOMAIN RIVER

12 MI E OF PICKFORD, Chippewa, MI

Built 1980 Load: 36.0 t ADT: 220

US-127 NB

Fair

Over: M-21

1.6 MI E OF US-127 BR, Clinton, MI

Built 1993 Load: 36.0 t ADT: 10,100

MCMASTERS BRIDGERD

Fair

Over: AU SABLE RIVER

16 MI E OF GRAYLING, Crawford, MI

Built 1990 Load: 36.0 t ADT: 199

BASE LINE HWY

Fair

Over: I-69

2.4 MI SW OF OLIVET, Eaton, MI

Built 1972 Load: 36.0 t ADT: 126

SHERWOOD ROAD

Fair

Over: I-69

1.0 MI W OF OLIVET, Eaton, MI

Built 1972 Load: 36.0 t ADT: 140

I-96 E TO I-496 E

Fair

Over: I-96

3.5 MI W OF LANSING, Eaton, MI

Built 1969 Load: 36.0 t ADT: 17,512

I-475 SB

Fair

Over: MAPLE RD

1.5 MI S OF FLINT, Genesee, MI

Built 1971 Load: 36.0 t ADT: 20,200

BRISTOL RD(OLDM121

Fair

Over: I-475

0.5 MI S OF FLINT, Genesee, MI

Built 1971 Load: 36.0 t ADT: 17,300

I-475 NB

Fair

Over: MAPLE RD

1.5 MI S OF FLINT, Genesee, MI

Built 1971 Load: 36.0 t ADT: 20,200

JENNINGS ROAD

Fair

Over: PINE RUN

1700 FT NORTH OF VIENNA, Genesee, MI

Built 1937 Load: 36.0 t ADT: 4,394

M-28

Fair

Over: MUD CREEK

1.0 MI W OF ONTONAGON COL, Gogebic, MI

Built 1957 Load: 36.0 t ADT: 1,845

DUFFIELD ROAD

Fair

Over: PINE RIVER

SEC 33 SUMNER TWP, Gratiot, MI

Built 1989 Load: 36.0 t ADT: 106

MAIN STREET

Fair

Over: PINE RIVER

CITY OF ST LOUIS, Gratiot, MI

Built 1955 Load: 36.0 t ADT: 1,000

MOORE ROAD

Fair

Over: ST JOSEPH RIVER

0.4 MILES N OF M-99, Hillsdale, MI

Built 1974 Load: 36.0 t ADT: 1,426

BOOTJACK RD T641

Fair

Over: MCCALLUM CREEK

3 MI S OF LAKE LINDEN, Houghton, MI

Built 1980 Load: 36.0 t ADT: 864

WALNUT ST

Fair

Over: I-496

IN LANSING, Ingham, MI

Built 1968 Load: 36.0 t ADT: 12,100

STOUDT RD

Fair

Over: FISH CREEK

.25 MI WEST OF MATHERTON, Ionia, MI

Built 1985 Load: 36.0 t ADT: 116

WHITTEMORE RD

Fair

Over: AU GRES RIVER

1.75 MI E OF WHITTEMORE, Iosco, MI

Built 1975 Load: 36.0 t ADT: 1,090

OLD STATE RD

Fair

Over: E BR OF AU GRES RIVER

2.25 M W OF SAND LAKE RD, Iosco, MI

Built 1977 Load: 36.0 t ADT: 720

US-2 US-141

Fair

Over: DUNN CREEK

1.8 MI S OF CRYSTAL FALLS, Iron, MI

Built 1936 Load: 36.0 t ADT: 3,031

US-2 (ADAMS ST)

Fair

Over: IRON RIVER

400 FT NO OF S GENESEE, Iron, MI

Built 1997 Load: 36.0 t ADT: 7,655

US-127 NB

Fair

Over: EAST RIVER RD

0.1 MI N OF US-127 BR, Isabella, MI

Built 1961 Load: 36.0 t ADT: 8,625

SEARS RD

Fair

Over: N BRANCH KALAMAZOO R

4 MI EAST OF CONCORD, Jackson, MI

Built 1986 Load: 36.0 t ADT: 1,210

I-196 M-21 WB

Fair

Over: MARKET AVE & GRAND RIVER

IN GRAND RAPIDS, Kent, MI

Built 1963 Load: 36.0 t ADT: 32,500

32ND ST

Fair

Over: US-131

IN WYOMING, Kent, MI

Built 1958 Load: 36.0 t ADT: 16,925

I-69 EB

Fair

Over: S BR FLINT RIVER

SE OF LAPEER, Lapeer, MI

Built 1983 Load: 36.0 t ADT: 12,398

PEPPERMILL ROAD

Fair

Over: SOUTH BR. FLINT RIVER

SEC. 4-9 LAPEER TWP., Lapeer, MI

Built 1982 Load: 36.0 t ADT: 4,300

OREGON STREET

Fair

Over: FLINT RIVER

3280 FT EAST OF M24 JUNCT, Lapeer, MI

Built 1975 Load: 36.0 t ADT: 3,618

M-34

Fair

Over: BEAR CREEK

1.9 MILES SW OF CLAYTON, Lenawee, MI

Built 2005 Load: 36.0 t ADT: 4,061

I-75 NB

Fair

Over: OLD US-2

4.0 MI NE OF M-123, Mackinac, MI

Built 1963 Load: 36.0 t ADT: 2,039

21 MI RD

Fair

Over: M-53

1.0 MI N OF M-59, Macomb, MI

Built 1965 Load: 36.0 t ADT: 17,272

RYAN ROAD

Fair

Over: RED RUN DRAIN

0.37 MI S OF 14 MI RD, Macomb, MI

Built 1991 Load: 36.0 t ADT: 25,900

M-95

Fair

Over: BLACK RIVER

3.2 MI S OF US-41, Marquette, MI

Built 1942 Load: 36.0 t ADT: 2,378

US-23 NB

Fair

Over: BEAR CREEK

3.5 MI N OF M-50, Monroe, MI

Built 1961 Load: 36.0 t ADT: 16,735

US-23 NB

Fair

Over: N BR MACON RIVER

4.7 MI N OF M-50, Monroe, MI

Built 1961 Load: 36.0 t ADT: 16,735

I-75

Fair

Over: PAPER CO WATER MAINS

IN MONROE, Monroe, MI

Built 1955 Load: 36.0 t ADT: 63,962

BRIGGS ROAD

Fair

Over: FLAT RIVER

0.25 MI E OF BACKUS ROAD, Montcalm, MI

Built 1984 Load: 36.0 t ADT: 293

US-31 NB

Fair

Over: M-120

2.0 MI NE OF MUSKEGON, Muskegon, MI

Built 1964 Load: 36.0 t ADT: 22,817

M-20

Fair

Over: WHITE RIVER

6.5 MI E OF HESPERIA, Newaygo, MI

Built 1970 Load: 36.0 t ADT: 4,400

RED RIVER AVE U-T

Fair

Over: I-696

E OF EVERGREEN, Oakland, MI

Built 1987 Load: 36.0 t ADT: 5,800

LATHRUP ROAD

Fair

Over: I-696

CITY OF LATHRUP VILLAGE, Oakland, MI

Built 1988 Load: 36.0 t ADT: 2,000

LAHRING RD

Fair

Over: I-75

2.2 MI SE OF GENESEE COL, Oakland, MI

Built 1962 Load: 36.0 t ADT: 1,470

GUNN ROAD

Fair

Over: PENN CENTRAL RAILROAD

BET ADAMS & ORION RD, Oakland, MI

Built 1989 Load: 36.0 t ADT: 352

HURON RD

Fair

Over: HURON RIVER

EAST OF MILFORD RD, Oakland, MI

Built 1977 Load: 36.0 t ADT: 8,545

US-10

Fair

Over: MUSKEGON RIVER

IN EVART, Osceola, MI

Built 1934 Load: 36.0 t ADT: 4,700

M-68

Fair

Over: TROUT RIVER

2.2 MI W OF US-23, Presque Isle, MI

Built 1956 Load: 36.0 t ADT: 1,564

MAPLE VALLEY RD

Fair

Over: I-75 M-55

0.4 MI N OF MAPLE VALLEY, Roscommon, MI

Built 1971 Load: 36.0 t ADT: 500

I-75 US-10

Fair

Over: CSX RR

0.5 MI S OF M-81, Saginaw, MI

Built 1961 Load: 36.0 t ADT: 47,480

Showing 2,451-2,500 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.