County profile · official public datasets

Saginaw County, MI

315 public highway bridges tracked in the FHWA National Bridge Inventory: 28.9% rated Good, 52.7% Fair, 18.4% Poor.

315
Public bridges
28.9%
Good condition
18.4%
Poor condition

The verdict

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

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

72nd
of 83 on Poor share
18.4%
Poor-condition share
315
public highway bridges
1979
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.

Saginaw County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Saginaw County ranks #72 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 18.4%). Saginaw County, Michigan contains 315 public highway bridges. Roughly 28.9% are rated “Good,” 52.7% “Fair,” and 18.4% “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

315

Public highway bridges in Saginaw County

Good condition

28.9%

91 of 315 rated 7-9

Fair condition

52.7%

166 of 315 rated 5-6

Poor condition

18.4%

58 of 315 rated 4 or below

In-state Poor-share rank

#72 of 83

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

Condition distribution

Share of 315 NBI-tracked bridges by lowest applicable component rating.

Good
28.9% (91)
Fair
52.7% (166)
Poor
18.4% (58)

Saginaw County's Poor-condition bridges carry 63,494 vehicle crossings a day

That is 3.8% of the county's reported daily bridge traffic on 18.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,114 crossings a day against 6,745 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 313 of 315 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

45.4% of Saginaw County's bridges have passed the 50-year mark

143 of the 315 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 28.9% 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

GENESEE AVE over SAGINAW RIVER, built 1973, carries 16,546 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 58-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 63,494 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Saginaw County's bridges were built

315 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 75 of the county's bridges still in the inventory were built, which is 23.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1979) matches the Michigan average (1976).

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

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

The 5 Michigan counties nearest Saginaw County in number of bridges, with their condition splits. Its 18.4% Poor share is the 5th-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1976 is in line with the group.

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

Bridge inventory size and condition shares for Saginaw County and the 5 Michigan counties closest to it in inventory size
County Bridges Poor
Genesee County 371 15.4%
St. Clair County 327 8.3%
Saginaw County (this page) 315 18.4%
Monroe County 297 15.5%
Berrien County 272 5.9%
Washtenaw County 262 20.2%

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

Similar inventory size

Nearest county inventories outside MI (315 bridges here).

Similar average build year

Nearest mean year-built outside MI (1979 here).

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

All 315 Good 91 Fair 166 Poor 58

All bridges (315)

LAKEFIELD ROAD

Fair

Over: BEAVER CREEK

0.2 MI E OF FENMORE ROAD, Saginaw, MI

Built 1985 Load: 51.8 t ADT: 236

JOHNSON STREET

Fair

Over: SAGINAW RIVER

CITY OF SAGINAW, Saginaw, MI

Built 1983 Load: 51.9 t ADT: 12,150

HEMLOCK ROAD

Fair

Over: NORTH BRANCH BAD RIVER

0.1 MI N OF COLVIN ROAD, Saginaw, MI

Built 1998 Load: 52.8 t ADT: 1,831

SPENCER ROAD

Fair

Over: MARSH CREEK

1.3 MI E OF ORR ROAD, Saginaw, MI

Built 1977 Load: 53.8 t ADT: 840

FOWLER ROAD

Fair

Over: LAMB CREEK

0.1 MI N OF BALDWIN ROAD, Saginaw, MI

Built 2001 Load: 54.1 t ADT: 109

I-675 NB

Fair

Over: I-75

N JCT I-75, Saginaw, MI

Built 1971 Load: 55.1 t ADT: 3,061

PORTSMOUTH RD

Fair

Over: CHEBOYGANING CREEK

0.3 MI N OF BECKER ROAD, Saginaw, MI

Built 2006 Load: 56.0 t ADT: 2,750

MOORISH ROAD

Fair

Over: BIRCH RUN CREEK

0.5 MI N OF RATHBUN ROAD, Saginaw, MI

Built 1990 Load: 57.0 t ADT: 1,240

LUNNEY ROAD

Fair

Over: WHITMORE DRAIN

0.8 MI E OF IVA ROAD, Saginaw, MI

Built 2001 Load: 58.6 t ADT: 136

MERIDIAN ROAD

Fair

Over: NORTH BRANCH BAD RIVER

0.9 MI N OF COLVIN ROAD, Saginaw, MI

Built 2003 Load: 60.2 t ADT: 75

STATE ROAD

Fair

Over: TITTABAWASSEE OVERFLOW 1

0.1 MI E OF RIVER ROAD, Saginaw, MI

Built 1963 Load: 64.0 t ADT: 10,588

FORDNEY ROAD

Fair

Over: BEAVER CREEK

0.1 MI N OF BEAVER ROAD, Saginaw, MI

Built 1954 Load: 74.2 t ADT: 1,102

BURT ROAD

Fair

Over: FLINT RIVER

0.45 MI E OF SEYMOUR ROAD, Saginaw, MI

Built 2006 Load: 88.8 t ADT: 1,016

M-52

Fair

Over: SAWYER DRAIN

0.4 MI SOUTH OF OACKLEY, Saginaw, MI

Built 1964 Load: 97.2 t ADT: 6,000

FOWLER ROAD

Fair

Over: LITTLE POTATO CREEK

0.5 MI N OF MARION ROAD, Saginaw, MI

Built 1986 Load: 97.2 t ADT: 147

IVA ROAD

Fair

Over: WHITMORE DRAIN

0.2 MI N OF GEDDES ROAD, Saginaw, MI

Built 1975 Load: 97.2 t ADT: 185

IVA ROAD

Good

Over: WEEKS DRAIN

0.1 MI N OF DICE ROAD, Saginaw, MI

Built 1992 Load: 5.5 t ADT: 76

STEEL ROAD

Good

Over: LAMB CREEK

1.3 MI N OF KRAMER ROAD, Saginaw, MI

Built 1978 Load: 18.1 t ADT: 46

LONE ROAD

Good

Over: MCCLELLAN RUN

0.5 MI N OF GEDDES ROAD, Saginaw, MI

Built 1987 Load: 22.0 t ADT: 290

VOLKMER ROAD

Good

Over: NORTHWOOD CREEK

0.2 MI E OF BUECHE ROAD, Saginaw, MI

Built 1993 Load: 27.2 t ADT: 173

GARY ROAD

Good

Over: DEER CREEK

0.7 MI E OF MCKEIGHAN RD, Saginaw, MI

Built 1977 Load: 27.2 t ADT: 753

BEYER ROAD

Good

Over: HALF MOON DRAIN

0.1 MI N OF CANADA ROAD, Saginaw, MI

Built 2002 Load: 28.0 t ADT: 100

DICE ROAD

Good

Over: WHITMORE DRAIN

0.3 MI E OF FEHN ROAD, Saginaw, MI

Built 2003 Load: 29.0 t ADT: 86

BIRCH RUN ROAD

Good

Over: MISTEGUAY CREEK

1.8 MI E OF BISHOP ROAD, Saginaw, MI

Built 2004 Load: 29.3 t ADT: 162

CHAPIN RD

Good

Over: LAMB CREEK

CHAPIN TWP SEC 35/36, Saginaw, MI

Built 2005 Load: 29.5 t ADT: 560

CURTIS ROAD

Good

Over: BIRCH RUN CREEK

1.0 MI E OF TOM CRESSWELL, Saginaw, MI

Built 2004 Load: 29.8 t ADT: 210

BLOCK ROAD

Good

Over: DEAD CREEK

0.8 MI N OF BUSCH ROAD, Saginaw, MI

Built 1993 Load: 29.8 t ADT: 210

GARY ROAD

Good

Over: FAIRCHILD DRAIN

0.4 MI E OF GASPER ROAD, Saginaw, MI

Built 1993 Load: 30.1 t ADT: 1,272

ELMS ROAD

Good

Over: SILVER CREEK

0.7 MI N OF BIRCH RUN RD, Saginaw, MI

Built 1997 Load: 31.4 t ADT: 281

MARION ROAD

Good

Over: PICKEREL CREEK

0.2 MI E OF FRANDSCHE RD, Saginaw, MI

Built 1991 Load: 32.1 t ADT: 171

CURTIS ROAD

Good

Over: BIRCH RUN CREEK OVERFLOW

0.5 MI E OF TOM CRESSWELL, Saginaw, MI

Built 2004 Load: 32.4 t ADT: 210

M-52

Good

Over: MARSH CREEK

4.0 MI N OF ST CHARLES, Saginaw, MI

Built 2021 Load: 33.0 t ADT: 9,375

BURT ROAD

Good

Over: LAMB CREEK

0.9 MI E OF FOWLER ROAD, Saginaw, MI

Built 1983 Load: 33.0 t ADT: 153

CANADA ROAD

Good

Over: SILVER CREEK

0.3 MI W OF MOORISH, Saginaw, MI

Built 1997 Load: 35.8 t ADT: 234

M-13

Good

Over: BIRCH RUN OUTLET DRN

7.1 MI S OF M-46, Saginaw, MI

Built 2016 Load: 36.0 t ADT: 6,275

I-675 NB

Good

Over: WEISS ST

IN SAGINAW AT N CTY LMTS, Saginaw, MI

Built 1971 Load: 36.0 t ADT: 13,032

KOCHVILLE ROAD

Good

Over: KOCHVILLE DRAIN

0.4 MI E OF N MICHIGAN, Saginaw, MI

Built 2001 Load: 36.0 t ADT: 3,437

PETTIT ROAD

Good

Over: BIRCH RUN CREEK

0.4 MI N OF BUSCH ROAD, Saginaw, MI

Built 1990 Load: 36.0 t ADT: 224

I-675 NB

Good

Over: 5TH ST

IN SAGINAW, Saginaw, MI

Built 2011 Load: 36.3 t ADT: 11,654

HOULIHAN ROAD

Good

Over: BIRCH RUN DRAIN

SEC 15 T11N R4E, Saginaw, MI

Built 1999 Load: 36.3 t ADT: 10

MERIDIAN ROAD

Good

Over: SOUTH BRANCH BAD RIVER

0.1 MI N OF FERDEN ROAD, Saginaw, MI

Built 1984 Load: 36.4 t ADT: 120

JANES RD

Good

Over: I-75

1.0 MI N OF M-46 & I-75 B, Saginaw, MI

Built 2012 Load: 36.6 t ADT: 1,000

I-675 NB

Good

Over: 6TH ST

IN SAGINAW, Saginaw, MI

Built 2011 Load: 36.9 t ADT: 11,654

MARSHALL ROAD

Good

Over: SILVER CREEK

0.1 MI N OF CANADA ROAD, Saginaw, MI

Built 1986 Load: 36.9 t ADT: 169

I-675 SB

Good

Over: 6TH ST

IN SAGINAW, Saginaw, MI

Built 2011 Load: 37.6 t ADT: 11,654

I-675 NB

Good

Over: WARREN AVENUE

IN SAGINAW, Saginaw, MI

Built 2011 Load: 37.9 t ADT: 10,646

M-46

Good

Over: I-75

@ M-46, Saginaw, MI

Built 2021 Load: 37.9 t ADT: 16,800

DIXIE HIGHWAY

Good

Over: CASS RIVER

0.1 MI N OF NOTT ROAD, Saginaw, MI

Built 2011 Load: 37.9 t ADT: 6,823

I-675 SB

Good

Over: WARREN AVENUE

IN SAGINAW, Saginaw, MI

Built 2011 Load: 37.9 t ADT: 10,646

I-75 NB

Good

Over: CSX RR

0.3 MI S OF M-46, Saginaw, MI

Built 2021 Load: 37.9 t ADT: 32,900

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.