Total bridges
262
Public highway bridges in Washtenaw County
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.
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
- pre-1900 1
Built before 1900
1 bridges
- 1900s 1
1900–1909
1 bridges
- 1910s 1
1910–1919
1 bridges
- 1920s 12
1920–1929
12 bridges
- 1930s 7
1930–1939
7 bridges
- 1940s 6
1940–1949
6 bridges
- 1950s 14
1950–1959
14 bridges
- 1960s
1960–1969
83 bridges
- 1970s
1970–1979
34 bridges
- 1980s 26
1980–1989
26 bridges
- 1990s 27
1990–1999
27 bridges
- 2000s 20
2000–2009
20 bridges
- 2010s 26
2010–2019
26 bridges
- 2020s 4
2020–2029
4 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).
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Berrien County | 272 | 27.6% | 66.5% | 5.9% | 1979 |
| Washtenaw County (this page) | 262 | 23.3% | 56.5% | 20.2% | 1975 |
| Ottawa County | 254 | 40.9% | 52.8% | 6.3% | 1977 |
| Allegan County | 244 | 24.2% | 59% | 16.8% | 1978 |
| Tuscola County | 242 | 33.9% | 61.2% | 5% | 1980 |
| Ingham County | 241 | 15.8% | 68.9% | 15.4% | 1972 |
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).
- Yuma County, AZ · 262 bridges
- Rice County, KS · 262 bridges
- Lavaca County, TX · 262 bridges
- Albemarle County, VA · 262 bridges
Similar average build year
Nearest mean year-built outside MI (1975 here).
- San Bernardino County, CA · avg 1975 · 1,422 bridges
- Lane County, OR · avg 1975 · 1,010 bridges
- Fulton County, GA · avg 1975 · 775 bridges
- Westmoreland County, PA · avg 1975 · 620 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (53)
ROSBOLT RD
PoorOver: PAINT CREEK
AUGUSTA TWP SEC 15, Washtenaw, MI
Built 1928 Load: 8.1 t ADT: 69
GALLUP PARK ROAD
PoorOver: HURON RIVER
GALLUP PARK, Washtenaw, MI
Built 1976 Load: 8.1 t
BUSH ROAD
PoorOver: LETTS CREEK
SLVAN TWP SEC 2, Washtenaw, MI
Built 1968 Load: 9.7 t ADT: 200
PARKER ROAD
PoorOver: TRIB TO MILL CREEK
SCIO TWP SEC 30, Washtenaw, MI
Built 1968 Load: 10.7 t ADT: 300
SIBLEY ROAD (EAST)
PoorOver: LETTS CREEK
SYLVAN TWP SEC 2, Washtenaw, MI
Built 1968 Load: 12.0 t ADT: 200
SHARON VALLEY RD
PoorOver: RAISIN RIVER
SHARON TWP SEC. 33, Washtenaw, MI
Built 1960 Load: 12.9 t ADT: 151
OLD DIXBORO ROAD
PoorOver: HURON RIVER
ANN ARBOR TWP SEC 36, Washtenaw, MI
Built 1921 Load: 18.1 t ADT: 16,342
CROSS STREET
PoorOver: HURON RIVER
IN CITY OF YPSILANTI, Washtenaw, MI
Built 1984 Load: 19.4 t ADT: 5,000
STONY CREEK ROAD
PoorOver: PAINT CREEK
YPSILANTI TWP SEC 20 & 21, Washtenaw, MI
Built 1920 Load: 20.7 t ADT: 8,856
OLD DIXBORO ROAD
PoorOver: HURON RIVER
ANN ARBOR TWP SEC 36, Washtenaw, MI
Built 1921 Load: 20.8 t ADT: 16,342
MAIN ST-WHITMORE
PoorOver: HORSESHOE LAKE OUTLET
NORTHFIELD TWP SEC 5, Washtenaw, MI
Built 1920 Load: 21.6 t ADT: 5,803
JERUSALEM ROAD
PoorOver: MILL CREEK
LIMA TWP SEC 23 & 26, Washtenaw, MI
Built 1974 Load: 22.2 t ADT: 129
CHERRY HILL RD
PoorOver: FLEMING CREEK
SUPERIOR TWP SEC 18, Washtenaw, MI
Built 1980 Load: 22.4 t ADT: 1,941
US-12BR M-17
PoorOver: HURON RIVER
IN YPSILANTI (E MICH AVE), Washtenaw, MI
Built 1912 Load: 24.3 t ADT: 21,936
FORD ROAD
PoorOver: FLEMING CREEK
SUPERIOR TWP SEC 8 & 17, Washtenaw, MI
Built 1981 Load: 25.6 t ADT: 4,165
WILLIS ROAD
PoorOver: PAINT CREEK
AUGUSTA TWP SEC 3 & 10, Washtenaw, MI
Built 1924 Load: 26.8 t ADT: 6,209
LEFORGE STREET
PoorOver: HURON RIVER
IN CITY OF YPSILANTI, Washtenaw, MI
Built 1983 Load: 26.9 t ADT: 10,800
SAGER RD
PoorOver: MILL CREEK
LIMA TWP SEC 30 & 31, Washtenaw, MI
Built 1962 Load: 27.2 t ADT: 97
PROSPECT STREET
PoorOver: CONRAIL RAILROAD
IN CITY OF YPSILANTI, Washtenaw, MI
Built 1979 Load: 27.2 t ADT: 7,000
BEMIS
PoorOver: PAINT CREEK
YPSILANTI TWP SEC 34, Washtenaw, MI
Built 1964 Load: 28.1 t ADT: 449
DEXTER-CHELSEA RD
PoorOver: LETTS CREEK
LIMA TWP SEC 8, Washtenaw, MI
Built 1983 Load: 28.5 t ADT: 3,320
SHERIDAN ROAD
PoorOver: IRON CREEK
BRIDGEWATER TWP SEC 30, Washtenaw, MI
Built 1960 Load: 28.5 t ADT: 138
FULLER ROAD
PoorOver: SUGARCREEK
AUGUSTA TWP SEC 33, Washtenaw, MI
Built 1988 Load: 30.8 t ADT: 67
US-23 NB M-14 WB
PoorOver: MDOT RR CORRIDOR
0.9 MI E OF W JCT M-14, Washtenaw, MI
Built 1962 Load: 31.1 t ADT: 36,627
MERRITT RD
PoorOver: PAINT CREEK
YPSILANTI TWP SEC 28 & 33, Washtenaw, MI
Built 1965 Load: 31.2 t ADT: 230
PONTIAC TRAIL
PoorOver: US-23 SB M-14 EB
0.5 MI E OF W JCT M-14, Washtenaw, MI
Built 1962 Load: 31.8 t ADT: 2,300
DUNCAN ST
PoorOver: RIVER RAISIN
IN VILLAGE OF MANCHESTER, Washtenaw, MI
Built 1970 Load: 32.7 t ADT: 2,300
LISS ROAD
PoorOver: PAINT CREEK
AUGUSTA TWP SEC 34, Washtenaw, MI
Built 1924 Load: 32.8 t ADT: 112
ARKONA RD
PoorOver: STONYCREEK
AUGUSTA TWP SEC 28 33, Washtenaw, MI
Built 1926 Load: 33.5 t ADT: 146
US-23 NB
PoorOver: US-23 BR
0.1 MI E OF ANN ARBOR EX, Washtenaw, MI
Built 1962 Load: 33.7 t ADT: 39,120
US-23 SB
PoorOver: US-23 BR
0.1 MI N OF ANN ARBOR EX, Washtenaw, MI
Built 1962 Load: 33.7 t ADT: 39,120
US-23 SB/M-14 EB
PoorOver: M-14 W
@ W JCT US-23 (LOWER), Washtenaw, MI
Built 1962 Load: 33.7 t ADT: 24,781
US-23 NB
PoorOver: HURON RIVER DRIVE
0.8 MI N OF M-17, Washtenaw, MI
Built 1962 Load: 34.0 t ADT: 37,373
US-23 SB
PoorOver: HURON RIVER DRIVE
0.8 MI N OF M-17, Washtenaw, MI
Built 1962 Load: 34.0 t ADT: 37,373
NEWPORT RD
PoorOver: M-14
IN ANN ARBOR, Washtenaw, MI
Built 1966 Load: 34.3 t ADT: 1,624
US-23 SB M-14 EB
PoorOver: MDOT RR CORRIDOR
0.9 MI E OF W JCT M-14, Washtenaw, MI
Built 1962 Load: 34.7 t ADT: 36,627
GRASS RD
PoorOver: BAUERDRAIN
SALINE TWP SEC 4 & 5, Washtenaw, MI
Built 1961 Load: 35.5 t ADT: 133
WAGNER RD
PoorOver: M-14
0.4 MI NE OF I-94, Washtenaw, MI
Built 1966 Load: 36.3 t ADT: 12,183
HACK RD
PoorOver: MACON CREEK
SALINE TWP SEC 36, Washtenaw, MI
Built 1965 Load: 37.3 t ADT: 163
ELLSWORTH RD
PoorOver: US-23
0.3 MI N OF I-94, Washtenaw, MI
Built 1962 Load: 37.6 t ADT: 11,652
E MEDICAL CENTER
PoorOver: NORFOLK SOUTHERN RR
0.9 MI E OF US-23 BR, Washtenaw, MI
Built 1982 Load: 37.6 t ADT: 17,220
US-12
PoorOver: ANN ARBOR RR
3.4 MI NE OF SALINE, Washtenaw, MI
Built 1924 Load: 37.9 t ADT: 23,822
MILLER RD
PoorOver: M-14
1.3 MI NE OF I-94, Washtenaw, MI
Built 1966 Load: 39.2 t ADT: 8,611
MOHART
PoorOver: NORTH MACON CREEK
SALINE TWP SEC 35 & 36, Washtenaw, MI
Built 1956 Load: 39.4 t ADT: 112
KALMBACH RD
PoorOver: I-94
1.9 MI E OF JACKSON COL, Washtenaw, MI
Built 1960 Load: 39.5 t ADT: 1,349
DEXTER-ANN ARBR RD
PoorOver: HONEY CREEK
SCIO TWP SEC 22, Washtenaw, MI
Built 1975 Load: 40.8 t ADT: 6,651
US-23NB I-94BL
PoorOver: PACKARD RD
IN ANN ARBOR (PACKARD RD), Washtenaw, MI
Built 1962 Load: 41.1 t ADT: 39,120
US-23SB I-94BL
PoorOver: PACKARD RD
IN ANN ARBOR (PACKARD RD), Washtenaw, MI
Built 1962 Load: 41.1 t ADT: 39,120
M-52
PoorOver: I-94
1.5 MI S OF CHELSEA, Washtenaw, MI
Built 1960 Load: 41.1 t ADT: 6,756
STONY CREEK RD
PoorOver: US-23
3.4 MI N OF MONROE COL, Washtenaw, MI
Built 1962 Load: 62.2 t ADT: 3,115
Read our methodology - how this data is sourced, computed, and verified.
Related
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.