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.
All bridges (262)
US-23 SB
FairOver: I-94
@ US-23, Washtenaw, MI
Built 1962 Load: 0.0 t ADT: 27,274
LIMA CENTER ROAD
FairOver: MILL CREEK
LIMA TWP SEC 33 & 34, Washtenaw, MI
Built 1941 Load: 10.1 t ADT: 43
DANCER ROAD
FairOver: MILL CREEK
LIMA TWP SEC 26 & 27, Washtenaw, MI
Built 1928 Load: 10.1 t ADT: 149
WALDO RD
FairOver: MILL CREEK
SHARON TWP SEC 1, Washtenaw, MI
Built 1970 Load: 10.1 t ADT: 154
NOTTEN RD
FairOver: I-94
0.4 MI E OF JACKSON COL, Washtenaw, MI
Built 1960 Load: 12.6 t ADT: 75
MAPLE ROAD
FairOver: HURON RIVER
ANN ARBOR TWP SEC 7, Washtenaw, MI
Built 1876 Load: 13.6 t ADT: 1,963
GUENTHER RD
FairOver: MILL CREEK
LIMA TWP SEC 34, Washtenaw, MI
Built 1944 Load: 14.3 t ADT: 139
EAST DELHI ROAD
FairOver: HURON RIVER
SCIO TWP SEC 2, Washtenaw, MI
Built 1900 Load: 19.1 t ADT: 750
JOY RD
FairOver: US-23
1.5 MI N OF M-14, Washtenaw, MI
Built 1962 Load: 20.4 t ADT: 150
US-23 NB
FairOver: BARKER RD
0.7 MI S OF CO LINE, Washtenaw, MI
Built 1958 Load: 21.4 t ADT: 33,375
US-23 SB
FairOver: BARKER RD
0.7 MI S OF CO LINE, Washtenaw, MI
Built 1958 Load: 21.4 t ADT: 33,375
PRATT RD
FairOver: HONEY CREEK
SCIO TWP SEC 14 & 23, Washtenaw, MI
Built 1980 Load: 25.0 t ADT: 233
MARTZ RD
FairOver: PAINT CREEK
YPSILANTI TWP SEC 34, Washtenaw, MI
Built 1965 Load: 25.7 t ADT: 4,021
EARHART RD
FairOver: US-23
3.0 MI N OF M-17 & US-23, Washtenaw, MI
Built 1962 Load: 25.9 t ADT: 2,226
TEXTILE ROAD
FairOver: PAINT CREEK
YPSILANTI TWP SEC 21, Washtenaw, MI
Built 1930 Load: 26.0 t ADT: 7,252
DANCER ROAD
FairOver: MILL CREEK
LIMA TWP SEC 22 & 23, Washtenaw, MI
Built 1980 Load: 26.0 t ADT: 167
AUSTIN ROAD
FairOver: RIVER RAISIN
MANCHESTER TWP SEC 1, Washtenaw, MI
Built 1987 Load: 26.4 t ADT: 4,366
FREER RD
FairOver: I-94
1.0 MI E OF M-52, Washtenaw, MI
Built 1960 Load: 26.6 t ADT: 150
BEMIS RD
FairOver: US-23
2.5 MI S OF US-12, Washtenaw, MI
Built 1962 Load: 27.5 t ADT: 150
SHARON HOLLOW RD
FairOver: RIVER RAISIN
SHARON TWP SEC 29, Washtenaw, MI
Built 1980 Load: 27.7 t ADT: 1,949
JUDD ROAD (EAST)
FairOver: PAINT CREEK
AUGUSTA TWP SEC 10 & 15 W, Washtenaw, MI
Built 1984 Load: 28.1 t ADT: 163
JUDD ROAD (WEST)
FairOver: PAINT CREEK
AUGUSTA TWP SEC 10 & 15 E, Washtenaw, MI
Built 1984 Load: 28.1 t ADT: 142
LIBERTY RD
FairOver: I-94
0.7 MI S OF I-94 BL, Washtenaw, MI
Built 1956 Load: 28.2 t ADT: 10,376
STEINBACH ROAD
FairOver: MILL CREEK
LIMA TWP SEC 23 & 24, Washtenaw, MI
Built 1984 Load: 28.3 t ADT: 87
ARKONA ROAD
FairOver: SUGARCREEK
AUGUSTA TWP SEC 29 & 32, Washtenaw, MI
Built 1927 Load: 29.2 t ADT: 100
MAPLE ROAD
FairOver: SALINE RIVER
YORK TWP SEC 18, Washtenaw, MI
Built 1984 Load: 29.4 t ADT: 128
M-14 EB
FairOver: EARHART RD
0.5 MI E OF US-23, Washtenaw, MI
Built 1964 Load: 29.5 t ADT: 29,770
I-94 EB
FairOver: DANCER RD
4.5 MI E OF M-52, Washtenaw, MI
Built 1961 Load: 29.5 t ADT: 33,463
M-14 EB
FairOver: BEECHWOOD DRIVE
IN ANN ARBOR, Washtenaw, MI
Built 1966 Load: 29.5 t ADT: 19,982
SCIO CHURCH RD
FairOver: I-94
1.9 MI SW OF I-94 BL, Washtenaw, MI
Built 1956 Load: 29.8 t ADT: 11,472
WILLOW ROAD
FairOver: PAINT CREEK
AUGUSTA TWP SEC 22 & 27, Washtenaw, MI
Built 1986 Load: 30.0 t ADT: 3,340
PETERSBURG ROAD
FairOver: SALINE RIVER
YORK TWP SEC 33 & 34, Washtenaw, MI
Built 1989 Load: 30.1 t ADT: 447
WARREN RD
FairOver: US-23
0.5 MI N OF M-14, Washtenaw, MI
Built 1962 Load: 30.5 t ADT: 100
ZEEB ROAD
FairOver: HURON RIVER
SC10 TWP SEC 9 & 10, Washtenaw, MI
Built 1961 Load: 30.5 t ADT: 7,241
HURON RIVER DRIVE
FairOver: PITTSFIELD ANN ARBOR DRN
ANN ARBOR TWP SEC 35, Washtenaw, MI
Built 1979 Load: 30.8 t ADT: 5,954
STONE SCHOOL RD
FairOver: I-94
IN ANN ARBOR, Washtenaw, MI
Built 1954 Load: 31.4 t ADT: 350
ELLSWORTH RD
FairOver: I-94
SOUTH LIMITS OF ANN ARBOR, Washtenaw, MI
Built 1995 Load: 31.4 t ADT: 14,670
M-14
FairOver: US-23 BR HURON RIVER DRV
IN ANN ARBOR, Washtenaw, MI
Built 2000 Load: 31.4 t ADT: 39,963
DIXBORO RD
FairOver: M-14
1.6 MI E OF E JCT US-23, Washtenaw, MI
Built 1964 Load: 31.8 t ADT: 5,047
PARKER RD
FairOver: I-94
4.9 MI W OF M-14, Washtenaw, MI
Built 1961 Load: 32.1 t ADT: 2,534
WAGNER RD
FairOver: I-94
0.5 MI E OF M-14, Washtenaw, MI
Built 1960 Load: 32.4 t ADT: 12,183
SIBLEY ROAD (WEST)
FairOver: LETTS CREEK
SYLVAN TWP SEC 2, Washtenaw, MI
Built 1968 Load: 32.4 t ADT: 200
I-94 WB
FairOver: DANCER RD
4.5 MI E OF M-52, Washtenaw, MI
Built 1961 Load: 32.7 t ADT: 33,463
JACKSON AVE
FairOver: MILL CREEK
LIMA TWP SECTION 21, Washtenaw, MI
Built 1937 Load: 32.7 t ADT: 5,031
TORREY ROAD
FairOver: BIG MARSH DRAIN
AUGUSTA TWP SEC 35, Washtenaw, MI
Built 1996 Load: 32.7 t ADT: 450
GOODING RD
FairOver: SUGAR CREEK
AUGUSTA TWP SEC 29 & 30, Washtenaw, MI
Built 1978 Load: 32.7 t ADT: 73
KILKENNY COURT
FairOver: U OF M LAKE DRAIN
SCIO TWP SEC 27, Washtenaw, MI
Built 1990 Load: 32.7 t ADT: 133
BEACON LANE
FairOver: JOHNSON CREEK
SALEM TWP SEC 15, Washtenaw, MI
Built 1985 Load: 32.7 t ADT: 50
NIXON RD
FairOver: US-23 M-14
2.0 MI NE OF ANN ARBOR, Washtenaw, MI
Built 1962 Load: 33.7 t ADT: 775
M-153
FairOver: FLEMING CREEK
BTWN M-14 & PLYMOUTH-AA, Washtenaw, MI
Built 1964 Load: 34.7 t ADT: 13,388
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.