County profile · official public datasets

Genesee County, MI

371 public highway bridges tracked in the FHWA National Bridge Inventory: 22.9% rated Good, 61.7% Fair, 15.4% Poor.

371
Public bridges: 22.9%
Good condition: 15.4%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Genesee County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

57th
of 83 on Poor share: 15.4%
Poor-condition share: 371
public highway bridges: 1968
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.

Genesee County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Genesee County ranks #57 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.4%). Genesee County, Michigan contains 371 public highway bridges. Roughly 22.9% are rated “Good,” 61.7% “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.

Total bridges

371

Public highway bridges in Genesee County

Good condition

22.9%

85 of 371 rated 7-9

Fair condition

61.7%

229 of 371 rated 5-6

Poor condition

15.4%

57 of 371 rated 4 or below

In-state Poor-share rank

#57 of 83

Among Michigan counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 371 NBI-tracked bridges by lowest applicable component rating.

Good

22.9% (85)

Fair

61.7% (229)

Poor

15.4% (57)

Genesee County's Poor-condition bridges carry 550,598 vehicle crossings a day

That is 10.5% of the county's reported daily bridge traffic on 14.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 10,389 crossings a day against 7,056 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 367 of 371 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

67.7% of Genesee County's bridges have passed the 50-year mark

251 of the 371 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 22.9% 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 11.5% of the county's Poor-condition bridge traffic

I-475 over GILKEY CREEK, built 1976, carries 63,400 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 57-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 550,598 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

4
1920s

32
1930s

29
1940s

3
1950s

43
1960s

62
1970s

116
1980s

16
1990s

14
2000s

26
2010s

17
2020s

8

What this shows Construction peaked in the 1970s, when 116 of the county's bridges still in the inventory were built, which is 31.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1968, 8 years older than the Michigan average of 1976.

How Genesee County compares with Michigan's closest counties by inventory size

The 5 Michigan counties nearest Genesee 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 1968 against a peer-group mean of 1979 is 11 years older.

Showing the 5 closest of 82 Michigan counties eligible for comparison.

Bridge inventory size and condition shares for Genesee County and the 5 Michigan counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Macomb County	417	42.7%	49.6%	7.7%	1980
Genesee County (this page)	371	22.9%	61.7%	15.4%	1968
St. Clair County	327	41.3%	50.5%	8.3%	1985
Saginaw County	315	28.9%	52.7%	18.4%	1979
Monroe County	297	30%	54.5%	15.5%	1974
Berrien County	272	27.6%	66.5%	5.9%	1979

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 Genesee 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 Genesee County, both outside Michigan so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MI (371 bridges here).

Lee County, IL · 371 bridges
Carroll County, MO · 371 bridges
Fayette County, TX · 371 bridges
Clinton County, IA · 372 bridges

Similar average build year

Nearest mean year-built outside MI (1968 here).

Montgomery County, PA · avg 1968 · 828 bridges
San Joaquin County, CA · avg 1968 · 644 bridges
Providence County, RI · avg 1968 · 476 bridges
Imperial County, CA · avg 1968 · 444 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 371 Good 85 Fair 229 Poor 57

All bridges (371)

Sort:

Genesee County Bridge Snapshot

Condition distribution

Genesee County's Poor-condition bridges carry 550,598 vehicle crossings a day

67.7% of Genesee County's bridges have passed the 50-year mark

One structure carries 11.5% of the county's Poor-condition bridge traffic

How Genesee County compares with Michigan's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (371)

BEACH ST (OLDM-56)

I-75 RAMPS C & D

LAPEER RD

COLDWATER ROAD

I-69 EB

I-69 EB

I-69 WB

COURT ST - WB

M-54

I-475

SECOND ST

I-69

CARPENTER ROAD

WILLARD ROAD

I-475

I-69 WB

SAGINAW ST

12TH ST

I-475 RAMP F

MILLER RD

I-69 EB

COOK ROAD

I-69 WB

I-69 EB

I-69 EB

I-69 WB

I-69 WB

I-475

I-75 RAMP D

COLDWATER ROAD

I-475 OFF TO SELBY

BURPEE ROAD

SAGINAW RD

I-475

LINDEN RD

HOLLY RD

8TH ST SERVICE RD

E BD LONGWAY BLVD

BALDWIN ROAD

I-75

I-475

HILL ROAD

I-69

ARLENE DRIVE

I-69 EB

I-475

PIERSON RD

I-475

JENNINGS RD

I-75 SB

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