County profile · official public datasets

Washtenaw County, MI

262 public highway bridges tracked in the FHWA National Bridge Inventory: 23.3% rated Good, 56.5% Fair, 20.2% Poor.

262
Public bridges
23.3%
Good condition
20.2%
Poor condition

The verdict

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

Washtenaw County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

79th
of 83 on Poor share
20.2%
Poor-condition share
262
public highway bridges
1975
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.

Washtenaw County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Washtenaw County ranks #79 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 20.2%). Washtenaw County, Michigan contains 262 public highway bridges. Roughly 23.3% are rated “Good,” 56.5% “Fair,” and 20.2% “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

262

Public highway bridges in Washtenaw County

Good condition

23.3%

61 of 262 rated 7-9

Fair condition

56.5%

148 of 262 rated 5-6

Poor condition

20.2%

53 of 262 rated 4 or below

In-state Poor-share rank

#79 of 83

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

Condition distribution

Share of 262 NBI-tracked bridges by lowest applicable component rating.

Good
23.3% (61)
Fair
56.5% (148)
Poor
20.2% (53)

Washtenaw County's Poor-condition bridges carry 546,750 vehicle crossings a day

That is 17.6% of the county's reported daily bridge traffic on 20% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 10,514 crossings a day against 5,943 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 260 of 262 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

53.1% of Washtenaw County's bridges have passed the 50-year mark

139 of the 262 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 23.3% 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 7.2% of the county's Poor-condition bridge traffic

US-23NB I-94BL over PACKARD RD, built 1962, carries 39,120 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 53-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 546,750 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Washtenaw County's bridges were built

262 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 83 of the county's bridges still in the inventory were built, which is 31.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1975) matches the Michigan average (1976).

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

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

The 5 Michigan counties nearest Washtenaw County in number of bridges, with their condition splits. Its 20.2% Poor share is the 6th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1977 is in line with the group.

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

Bridge inventory size and condition shares for Washtenaw County and the 5 Michigan counties closest to it in inventory size
County Bridges Poor
Berrien County 272 5.9%
Washtenaw County (this page) 262 20.2%
Ottawa County 254 6.3%
Allegan County 244 16.8%
Tuscola County 242 5%
Ingham County 241 15.4%

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

Similar inventory size

Nearest county inventories outside MI (262 bridges here).

Similar average build year

Nearest mean year-built outside MI (1975 here).

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

All 262 Good 61 Fair 148 Poor 53

Good-condition bridges (61)

PECKINS RD

Good

Over: MILL CREEK

SHARON TWP. SEC. 12, Washtenaw, MI

Built 1972 Load: 26.2 t ADT: 387

BANDEMER PARK

Good

Over: HURON RIVER

BANDEMER PARK, Washtenaw, MI

Built 1995 Load: 26.2 t

BRIDGE ROAD

Good

Over: HURON RIVER

YPSILANTI TWP SEC 24, Washtenaw, MI

Built 1992 Load: 27.3 t ADT: 7,289

CHALMERS RD

Good

Over: PITTSFIELD ANN ARBOR DRN

ANN ARBOR TWP SEC 35, Washtenaw, MI

Built 1951 Load: 29.0 t ADT: 350

ISLAND DRIVE

Good

Over: TRAVER CREEK

0.75 MI E OF US-23 BR, Washtenaw, MI

Built 1962 Load: 29.5 t ADT: 959

SOUTH FIFTH AVE

Good

Over: PARKING STRUCTURE

BTWN LIBERTY & WILLIAMS, Washtenaw, MI

Built 2011 Load: 31.1 t ADT: 10,544

JACKSON RD (WB)

Good

Over: HONEY CREEK

SECTION 21 SCIO TOWNSHIP, Washtenaw, MI

Built 1999 Load: 32.7 t ADT: 10,088

ZEEB ROAD

Good

Over: HONEY CREEK

SCIO TWP SEC 21, Washtenaw, MI

Built 1993 Load: 32.7 t ADT: 21,634

SEITZ DRIVE

Good

Over: LUICK CREEK

LIMA TWP SEC 16, Washtenaw, MI

Built 1961 Load: 32.7 t ADT: 233

JUDD ROAD

Good

Over: ANN ARBOR RAILROAD

YORK TWP SEC 10 & 15, Washtenaw, MI

Built 2006 Load: 32.7 t ADT: 425

JACKSON RD (EB)

Good

Over: HONEY CREEK

SECTION 21 SCIO TOWNSHIP, Washtenaw, MI

Built 1999 Load: 32.7 t ADT: 9,850

POLO FIELDS DRIVE

Good

Over: U OF M LAKE DRAIN

SCIO TWP SEC 27, Washtenaw, MI

Built 1990 Load: 32.7 t ADT: 1,595

BIRKDALE DRIVE

Good

Over: U OF M LAKE DRAIN

SCIO TWP SEC 27, Washtenaw, MI

Built 1990 Load: 32.7 t ADT: 266

DORNOCH DRIVE

Good

Over: U OF M LAKE DRAIN

SCIO TWP SEC 27, Washtenaw, MI

Built 1990 Load: 32.7 t ADT: 1,003

RIDGE ROAD

Good

Over: FOWLER CREEK

SUPERIOR TWP SEC 36, Washtenaw, MI

Built 2013 Load: 32.7 t ADT: 150

MAST RD

Good

Over: ARMS CREEK

0.5 MI N OF WALSH RD, Washtenaw, MI

Built 2018 Load: 34.7 t ADT: 3,435

MAIN STREET

Good

Over: RIVER RAISIN

IN MANCHESTER, Washtenaw, MI

Built 2016 Load: 35.0 t ADT: 2,800

VAN TUYLE ROAD

Good

Over: IRON CREEK

MANCHESTER TWP SEC 25, Washtenaw, MI

Built 2018 Load: 36.3 t ADT: 250

STAEBLER ROAD

Good

Over: HONEY CREEK

SCIO TWP SEC 20, Washtenaw, MI

Built 2004 Load: 37.0 t ADT: 726

ALLEN ROAD

Good

Over: RIVER RAISIN

BRIDGEWATER TWP SEC 29&32, Washtenaw, MI

Built 1993 Load: 38.0 t ADT: 287

N TERRITORIAL RD

Good

Over: US-23

3.7 MI S OF LIVINGSTON CO, Washtenaw, MI

Built 2017 Load: 38.2 t ADT: 9,666

FORD BOULEVARD

Good

Over: MDOT RR CORRIDOR

YPSILANTI TWP SEC 11, Washtenaw, MI

Built 2013 Load: 39.9 t ADT: 16,513

FOREST AVENUE

Good

Over: HURON RIVER

IN CITY OF YPSILANTI, Washtenaw, MI

Built 1964 Load: 41.1 t ADT: 5,254

GEDDES ROAD

Good

Over: FLEMING CREEK

ANN ARBOR TWP SEC 25, Washtenaw, MI

Built 1989 Load: 41.6 t ADT: 10,439

DEXTER-PINCKNEY RD

Good

Over: PORTAGE LAKE CANAL

DEXTER TWP SECTION 2, Washtenaw, MI

Built 2010 Load: 41.8 t ADT: 7,407

PARKER RD

Good

Over: MILL CREEK

SCIO TWP SEC 18, Washtenaw, MI

Built 2007 Load: 42.6 t ADT: 2,867

WHITTAKER ROAD

Good

Over: PAINT CREEK

YPSILANTI TWP SEC 28, Washtenaw, MI

Built 2007 Load: 42.7 t ADT: 11,389

6 MI RD

Good

Over: US-23

2.7 MI S OF LIVINGSTON CO, Washtenaw, MI

Built 2017 Load: 42.8 t ADT: 5,625

8 MILE ROAD

Good

Over: TOBIN DRAIN

NORTHFIELD TWP SEC 3, Washtenaw, MI

Built 1999 Load: 43.2 t ADT: 468

BROADWAY

Good

Over: DEPOT ST & MDOT RR COR

0.5 MI E OF MAIN STREET, Washtenaw, MI

Built 2004 Load: 45.4 t ADT: 20,630

TALLADAY ROAD

Good

Over: PAINT CREEK

AUGUSTA TWP SEC 15 & 22, Washtenaw, MI

Built 2003 Load: 45.9 t ADT: 357

MCKINLEY ROAD

Good

Over: MILL CREEK FORK

LIMA TWP SEC 6, Washtenaw, MI

Built 2012 Load: 47.0 t ADT: 200

WHITTAKER ROAD

Good

Over: PAINT CREEK

AUGUSTA TWP SEC 9 & 10, Washtenaw, MI

Built 2007 Load: 47.2 t ADT: 3,400

BROADWAY

Good

Over: HURON RIVER

0.5 MI E OF MAIN STREET, Washtenaw, MI

Built 2004 Load: 48.9 t ADT: 20,630

HURON RIVER DRIVE

Good

Over: HURON RIVER

SCIO TWP SECTION 11, Washtenaw, MI

Built 1994 Load: 49.4 t ADT: 3,534

HURON RIVER DRIVE

Good

Over: HONEY CREEK

SCIO TWP SEC 12, Washtenaw, MI

Built 1994 Load: 49.7 t ADT: 3,534

5 MILE RD

Good

Over: HORSESHOE DRAIN

450 FT N OF N TERRITORIAL, Washtenaw, MI

Built 2017 Load: 49.9 t ADT: 5,625

GEDDES ROAD

Good

Over: FOWLER CREEK

SUPERIOR TWP SECTION 25, Washtenaw, MI

Built 2021 Load: 51.2 t ADT: 9,991

MILLER ROAD

Good

Over: HONEY CREEK

SCIO TOWNSHIP SECTION 14, Washtenaw, MI

Built 2021 Load: 51.5 t ADT: 4,600

DENNISON ROAD

Good

Over: SALINE RIVER

YORK TWP SEC 28, Washtenaw, MI

Built 1965 Load: 51.8 t ADT: 1,049

SALINE-MILAN ROAD

Good

Over: KOCH DRAIN

YORK TWP SEC 6, Washtenaw, MI

Built 2019 Load: 52.2 t ADT: 3,237

HITCHINGHAM ROAD

Good

Over: BUCKCREEK

AUGUSTA TWP SEC 28 & 29, Washtenaw, MI

Built 2002 Load: 52.7 t ADT: 80

US-23 NB

Good

Over: MDOT RR CORRIDOR

0.5 MI S OF LIVINGSTON CO, Washtenaw, MI

Built 2017 Load: 53.1 t ADT: 33,375

SHARON VALLEY ROAD

Good

Over: RIVER RAISIN

SHARON TWP SEC 31, Washtenaw, MI

Built 2019 Load: 53.5 t ADT: 997

HURON PARKWAY

Good

Over: PEDESTRIAN/UTILITIES

0.25 MI S OF PLYMOUTH RD, Washtenaw, MI

Built 2001 Load: 53.8 t ADT: 13,428

FELDKAMP ROAD

Good

Over: SALINE RIVER

SALINE TWP SEC 17, Washtenaw, MI

Built 2014 Load: 55.1 t ADT: 108

SHIELD RD

Good

Over: MILL CREEK

SC10 TWP SEC 7, Washtenaw, MI

Built 2017 Load: 55.4 t ADT: 3,403

AUSTIN ROAD

Good

Over: SALINE RIVER

SALINE TWP SEC 4, Washtenaw, MI

Built 2015 Load: 55.7 t ADT: 3,335

STRAWBERRY LAKE RD

Good

Over: ARMS CREEK

WEBSTER TWP SEC 7, Washtenaw, MI

Built 2018 Load: 55.7 t ADT: 271

US-23 SB

Good

Over: MDOT RR CORRIDOR

0.5 MI S OF LIVINGSTON CO, Washtenaw, MI

Built 2017 Load: 58.6 t ADT: 33,375

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.