County profile · official public datasets

Lenawee County, MI

225 public highway bridges tracked in the FHWA National Bridge Inventory: 47.6% rated Good, 39.6% Fair, 12.9% Poor.

225
Public bridges
47.6%
Good condition
12.9%
Poor condition

The verdict

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

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

50th
of 83 on Poor share
12.9%
Poor-condition share
225
public highway bridges
1981
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.

Lenawee County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lenawee County ranks #50 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 12.9%). Lenawee County, Michigan contains 225 public highway bridges. Roughly 47.6% are rated “Good,” 39.6% “Fair,” and 12.9% “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

225

Public highway bridges in Lenawee County

Good condition

47.6%

107 of 225 rated 7-9

Fair condition

39.6%

89 of 225 rated 5-6

Poor condition

12.9%

29 of 225 rated 4 or below

In-state Poor-share rank

#50 of 83

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

Condition distribution

Share of 225 NBI-tracked bridges by lowest applicable component rating.

Good
47.6% (107)
Fair
39.6% (89)
Poor
12.9% (29)

Lenawee County's Poor-condition bridges carry 63,116 vehicle crossings a day

That is 14% of the county's reported daily bridge traffic on 12.9% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,176 crossings a day against 1,047 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 225 of 225 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

29.8% of Lenawee County's bridges have passed the 50-year mark

67 of the 225 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 47.6% 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 26.1% of the county's Poor-condition bridge traffic

US-223 over NORFOLK SOUTHERN RR, built 1941, carries 16,443 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 29-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 63,116 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Lenawee County's bridges were built

225 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 52 of the county's bridges still in the inventory were built, which is 23.1% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1981, 5 years newer than the Michigan average of 1976.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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

The 5 Michigan counties nearest Lenawee County in number of bridges, with their condition splits. Its 12.9% Poor share is the 2nd-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1975 is 6 years newer.

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

Bridge inventory size and condition shares for Lenawee County and the 5 Michigan counties closest to it in inventory size
County Bridges Poor
Allegan County 244 16.8%
Tuscola County 242 5%
Ingham County 241 15.4%
Lenawee County (this page) 225 12.9%
Clinton County 216 15.7%
Calhoun County 213 18.3%

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

Similar inventory size

Nearest county inventories outside MI (225 bridges here).

Similar average build year

Nearest mean year-built outside MI (1981 here).

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

All 225 Good 107 Fair 89 Poor 29

All bridges (225)

NELSON RD

Good

Over: BEAN CREEK

0.1 MI E OF CRAMER HWY, Lenawee, MI

Built 1990 Load: 31.5 t ADT: 185

CARLETON RD

Good

Over: SOUTH BRANCH RAISIN RIVR

0.5 MI EAST OF WHIG HWY, Lenawee, MI

Built 1974 Load: 31.6 t ADT: 171

M-52

Good

Over: BLACK CREEK

0.5 MI S OF JASPER, Lenawee, MI

Built 1947 Load: 31.8 t ADT: 3,862

CANANDAIGUA ROAD

Good

Over: BEAN CREEK

0.10 MI E OF HARRIS HWY, Lenawee, MI

Built 1981 Load: 31.8 t ADT: 368

SORBY HWY

Good

Over: FITTS CREEK

0.1 MI N OF RAYMOND RD, Lenawee, MI

Built 1985 Load: 32.1 t ADT: 105

DEMINGS LAKE RD

Good

Over: S BRANCH RAISIN RIVER

0.1 MI E OF WHIG HWY, Lenawee, MI

Built 1991 Load: 32.4 t ADT: 236

US-12

Good

Over: PEDESTRIAN WALKWAY

AT MIS SPEEDWAY, Lenawee, MI

Built 2004 Load: 32.4 t ADT: 4,500

PACKARD RD

Good

Over: BEAN CREEK

0.4 MI W OF M-156, Lenawee, MI

Built 1989 Load: 32.6 t ADT: 76

LAWRENCE RD

Good

Over: BEAN CREEK

EAST OF DILLON HWY, Lenawee, MI

Built 1993 Load: 32.7 t ADT: 243

MUNSON HWY

Good

Over: LIME CREEK

0.2 MI SOUTH OF LIME CRK, Lenawee, MI

Built 1985 Load: 32.7 t ADT: 185

MOORE RD

Good

Over: BEAVER CREEK

0.1 MI W OF CARSON HWY, Lenawee, MI

Built 1994 Load: 32.7 t ADT: 675

GROSVENOR HWY

Good

Over: SWAMP RAISIN DRAIN

0.2 MI SOUTH OF MITCHELL, Lenawee, MI

Built 2008 Load: 32.7 t ADT: 192

HOAGLAND HWY

Good

Over: SCHENK BEN KELLY DRAIN

0.1 MI NORTH OF HOLLOWAY, Lenawee, MI

Built 2003 Load: 32.7 t ADT: 36

HODDINOTT RD

Good

Over: WALKER CREEK

0.5 MI W OF SPRINGVILLE, Lenawee, MI

Built 1983 Load: 32.7 t ADT: 35

W YANKEE RD

Good

Over: SILVERCREEK

0.2 MI WEST OF WESTON RD, Lenawee, MI

Built 1987 Load: 32.7 t ADT: 828

MATTHEWS HWY

Good

Over: EVANS CREEK

0.5 MI S OF MUNGER RD, Lenawee, MI

Built 2000 Load: 32.7 t ADT: 2,379

MEDINA ROAD

Good

Over: BEAR CREEK

0.2 MI E OF M-156, Lenawee, MI

Built 1988 Load: 32.9 t ADT: 46

GARNO RD

Good

Over: SWAMP RAISIN

0.5 MI W OF SISSION HWY, Lenawee, MI

Built 1990 Load: 33.1 t ADT: 61

MILLS-MACON HWY

Good

Over: MACON RIVER

0.3 MI N OF PENNINGTON, Lenawee, MI

Built 1988 Load: 33.1 t ADT: 40

RIDGE HWY

Good

Over: MACON RIVER

WEST OF BRITTON HWY, Lenawee, MI

Built 1997 Load: 33.2 t ADT: 5,309

LIME CREEK ROAD

Good

Over: LIME CREEK

0.25 MI W OF MUNSON HWY, Lenawee, MI

Built 1986 Load: 33.3 t ADT: 294

MULBERRY RD

Good

Over: NILE DRAIN

0.1 MI W OF SAND CRK HWY, Lenawee, MI

Built 1969 Load: 33.4 t ADT: 87

MACON HWY

Good

Over: MIDDLE BR OF MACON RIVER

0.2 MI S OF HACK RD, Lenawee, MI

Built 1998 Load: 33.5 t ADT: 562

HODGES HWY

Good

Over: BEAR CREEK

0.5 MI S OF RIDGEVILLE, Lenawee, MI

Built 1991 Load: 33.6 t ADT: 61

GILBERT HWY

Good

Over: WOLF CREEK

NORTH OF REED RD, Lenawee, MI

Built 1998 Load: 33.6 t ADT: 1,204

PENNINGTON RD

Good

Over: MIDDLE BR OF MACON RIVER

0.4 MI E OF MILLS-MACON, Lenawee, MI

Built 1990 Load: 34.0 t ADT: 97

BRITTON HWY

Good

Over: MACON RIVER

0.5 MI SOUTH OF WELCH RD, Lenawee, MI

Built 1964 Load: 34.8 t ADT: 1,130

FORRISTER RD

Good

Over: WILKES CREEK

WEST OF SPRINGVILLE HWY, Lenawee, MI

Built 1966 Load: 35.0 t ADT: 559

BLISSFIELD HWY

Good

Over: SWAMP RAISIN DRAIN

0.1 MI NORTH OF MCMAHON, Lenawee, MI

Built 1968 Load: 35.0 t ADT: 954

TIPTON HWY

Good

Over: WOLF CREEK

0.3 MI N OF COUNTRY CLUBR, Lenawee, MI

Built 1986 Load: 35.2 t ADT: 3,827

WARWICK ROAD

Good

Over: BEAN CREEK

0.5 MI SOUTH OF MEDINA RD, Lenawee, MI

Built 1980 Load: 35.6 t ADT: 236

M-50

Good

Over: WILSON CREEK

1.0 MI W OF M-52, Lenawee, MI

Built 1997 Load: 36.3 t ADT: 7,076

MECHANIC STEET

Good

Over: BEAN CREEK

645 E OF MARKET ST, Lenawee, MI

Built 1977 Load: 36.3 t ADT: 570

LIME CREEK ROAD

Good

Over: BEAN CREEK

0.3 MI WEST OF M-156, Lenawee, MI

Built 2002 Load: 36.5 t ADT: 476

BEECHER RD

Good

Over: FITTS CREEK

0.25 MI EAST OF KEIL HWY, Lenawee, MI

Built 1967 Load: 36.6 t ADT: 1,234

ELLIOTT HWY

Good

Over: BLACK CREEK

0.4 MI NORTH OF WESTON RD, Lenawee, MI

Built 2006 Load: 36.8 t ADT: 347

W MAIN STREET

Good

Over: BEAN CREEK

0.17 MI WEST OF M-156, Lenawee, MI

Built 1949 Load: 36.9 t ADT: 3,500

INGALL HWY

Good

Over: LIME CREEK

0.5 MI N OF RIDGEVILLE RD, Lenawee, MI

Built 1974 Load: 37.7 t ADT: 162

M-34

Good

Over: S BR RAISIN RIVER

3.2 MI E OF M-156, Lenawee, MI

Built 1991 Load: 37.9 t ADT: 4,413

M-50

Good

Over: WILSON SPRING DRAIN

WEST LIMITS OF BRITTON, Lenawee, MI

Built 2000 Load: 37.9 t ADT: 6,842

BRAZEE RD

Good

Over: BLACK CREEK

0.4 MI W OF KNIGHT HWY, Lenawee, MI

Built 1965 Load: 38.1 t ADT: 86

SOUTHARD HWY

Good

Over: HAZEN CREEK

0.4 MI S OF BURTON RD, Lenawee, MI

Built 1988 Load: 39.2 t ADT: 48

STEARNS HWY

Good

Over: SWAMP RAISIN DRAIN

0.3 MI N OF LABERDEE RD, Lenawee, MI

Built 1996 Load: 39.3 t ADT: 245

BUCHOLTZ HWY

Good

Over: S BR LITTLE RIVER RAISIN

0.3 MI S OF LABERDEE RD, Lenawee, MI

Built 2005 Load: 39.6 t ADT: 990

LIPP HWY

Good

Over: DRAPER DRAIN

0.2 MI NORTH OF RIDGEVILL, Lenawee, MI

Built 2004 Load: 40.2 t ADT: 50

HAMILTON HWY

Good

Over: WOLF CREEK

0.2 MI N OF US-223, Lenawee, MI

Built 1989 Load: 40.3 t ADT: 130

BOTHWELL HWY

Good

Over: BEAN CREEK

0.2 MI S OF MEDINA RD, Lenawee, MI

Built 1980 Load: 40.5 t ADT: 91

VALLEY RD

Good

Over: BEAVER CREEK

0.1 MI WEST OF CARSON HWY, Lenawee, MI

Built 2005 Load: 40.8 t ADT: 3,350

FIKE ROAD

Good

Over: BLACK CREEK

0.2 MI E OF BAKER HWY, Lenawee, MI

Built 1990 Load: 40.9 t ADT: 93

TEACHOUT RD

Good

Over: WOLF CREEK

0.3 MI E OF GILBERT HWY, Lenawee, MI

Built 2006 Load: 41.3 t ADT: 145

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

Related

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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.