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

Good-condition bridges (107)

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

ACADEMY RD

Good

Over: RIVER RAISIN

1.5 MI E OF ADRIAN, Lenawee, MI

Built 1982 Load: 41.4 t ADT: 349

DOWNING HWY

Good

Over: LITTLE RIVER RAISIN

0.2 MI NORTH OF SUTTON RD, Lenawee, MI

Built 2007 Load: 41.5 t ADT: 34

CANANDAIGUA RD

Good

Over: BEAR CREEK

0.25 MI EAST OF M-156, Lenawee, MI

Built 2006 Load: 42.0 t ADT: 190

BUCHOLTZ HWY

Good

Over: SCHENK BEN KELLY DRAIN

0.1 MI S OF SUTTON RD, Lenawee, MI

Built 2003 Load: 42.0 t ADT: 49

M-34

Good

Over: BEAN CREEK

IN HUDSON, Lenawee, MI

Built 1998 Load: 42.1 t ADT: 6,285

BRAMBLE HWY

Good

Over: EVANS CREEK

0.5 MI N OF M-50, Lenawee, MI

Built 2003 Load: 42.5 t ADT: 144

HOAGLAND HWY

Good

Over: LITTLE RIVER RAISIN

0.5 MI NORTH OF SUTTON RD, Lenawee, MI

Built 2007 Load: 42.5 t ADT: 79

SISSON RD

Good

Over: S BR LITTLE RIVER RAISIN

0.3 MI N OF FORCHE RD, Lenawee, MI

Built 2013 Load: 42.8 t ADT: 75

EGAN HWY

Good

Over: WAMPLERS LAKE CHANNEL

1.2 MI N-E OF US-12, Lenawee, MI

Built 1988 Load: 43.0 t ADT: 1,208

COUNTRY CLUB

Good

Over: WOLF CREEK

0.1 MI WEST OF TIPTON HWY, Lenawee, MI

Built 2021 Load: 43.4 t ADT: 4,075

HORTON RD

Good

Over: BEAR CREEK

0.2 MI E OF PENCE HWY, Lenawee, MI

Built 1973 Load: 43.5 t ADT: 396

LIME CREEK ROAD

Good

Over: DEWEY LAKE DRAIN

0.25 MI E OF MUNSON HWY, Lenawee, MI

Built 1989 Load: 43.6 t ADT: 273

RIXOM HWY

Good

Over: SCHENK BEN KELLY DRAIN

0.4 MI S OF SUTTON RD, Lenawee, MI

Built 1997 Load: 43.8 t ADT: 80

BENNER HWY

Good

Over: HAZEN CREEK

0.3 MI NORTH OF BEECHER R, Lenawee, MI

Built 2006 Load: 43.9 t ADT: 634

LOWE RD

Good

Over: BEAN CREEK

0.2 MI E OF MUNSON HWY, Lenawee, MI

Built 1997 Load: 44.0 t ADT: 94

WHITE PINE HWY

Good

Over: LIME CREEK

0.4 MI N OF RIDGEVILLE RD, Lenawee, MI

Built 2003 Load: 44.9 t ADT: 43

HACK RD

Good

Over: N MACON CREEK

0.2 MI W OF CO. LINE HWY, Lenawee, MI

Built 2005 Load: 45.3 t ADT: 98

WELLSVILLE HWY

Good

Over: SWAMP RAISIN DRAIN

0.3 MI S OF MITCHELL RD, Lenawee, MI

Built 1989 Load: 45.7 t ADT: 165

BRITTON HWY

Good

Over: MACON RIVER

0.5 MI NORTH OF WELCH RD, Lenawee, MI

Built 1989 Load: 46.3 t ADT: 1,130

TERRY HWY

Good

Over: BLACK CREEK

0.3 MI N OF WESTON RD, Lenawee, MI

Built 1987 Load: 47.6 t ADT: 40

N ADRIAN HWY

Good

Over: EVANS CREEK

0.3 MI SOUTH OF MUNGER RD, Lenawee, MI

Built 2004 Load: 47.6 t ADT: 385

BENT OAK HWY

Good

Over: BEAVER CREEK

0.3 MI NORTH OF MOORE RD, Lenawee, MI

Built 2016 Load: 48.0 t ADT: 1,059

ROME ROAD

Good

Over: FITTS CREEK

0.25 MI EAST OF KEIL HWY, Lenawee, MI

Built 1988 Load: 48.1 t ADT: 1,003

GILBERT HWY

Good

Over: WOLF CREEK

0.5 MI NORTH OF TEACHOUT, Lenawee, MI

Built 1988 Load: 48.1 t ADT: 894

ARNOLD HWY

Good

Over: NILE DRAIN

0.1 MI S OF STAUP RD, Lenawee, MI

Built 1973 Load: 48.5 t ADT: 49

TECUMSEH SCHOOL

Good

Over: EVANS CREEK

TECUMSEH HIGH SCHOOL, Lenawee, MI

Built 2001 Load: 49.2 t ADT: 2,502

RIDGEVILLE RD

Good

Over: BEAN CREEK

0.1 MI S OF MOREY HWY, Lenawee, MI

Built 1987 Load: 49.3 t ADT: 58

BRUCE HWY

Good

Over: GLEASON BROOK

0 4 MI N OF HORTON, Lenawee, MI

Built 1988 Load: 49.9 t ADT: 57

SENECA HWY

Good

Over: HARRISON DRAIN

0.5 MI N OF M-34, Lenawee, MI

Built 1995 Load: 51.3 t ADT: 45

LYONS HWY

Good

Over: S BRANCH RIVER RAISIN

0.1 MI S OF SAND CRK HWY, Lenawee, MI

Built 2007 Load: 52.7 t ADT: 1,808

LIVESAY RD

Good

Over: STONEY CREEK

0.1 MI W OF SAND CRK HWY, Lenawee, MI

Built 1964 Load: 53.5 t ADT: 99

ARNOLD HWY

Good

Over: NILE DRAIN

0.1 MI E OF M-52, Lenawee, MI

Built 2002 Load: 54.5 t ADT: 65

TUTTLE HWY

Good

Over: BEAR CREEK DRAIN

0.1 MI NORTH OF HORTON RD, Lenawee, MI

Built 1995 Load: 55.3 t ADT: 175

BENNER HWY

Good

Over: RIVER RAISIN SOUTH BR

CARLETON RD INTERSECTION, Lenawee, MI

Built 2012 Load: 56.4 t ADT: 735

RIDGEVILLE RD

Good

Over: LIME CREEK

0.1 MI E OF RANGER HWY, Lenawee, MI

Built 1999 Load: 56.6 t ADT: 91

LABERDEE RD

Good

Over: RIVER RAISIN

0.5 MI W OF WILMOTH HWY, Lenawee, MI

Built 2008 Load: 56.9 t ADT: 1,382

LYONS HWY

Good

Over: BLACK CREEK

0.4 MI S OF PACKARD RD, Lenawee, MI

Built 2009 Load: 57.1 t ADT: 1,117

WILMOTH HWY

Good

Over: RIVER RAISIN

0.4 MI SOUTH OF E VALLEY, Lenawee, MI

Built 2017 Load: 57.3 t ADT: 1,503

CROCKETT HWY

Good

Over: BLACK CREEK

0.5 MI SOUTH OF GORMAN RD, Lenawee, MI

Built 2016 Load: 57.7 t ADT: 874

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

Related

Browse all → | Rankings →
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.