US Bridges

I-75 NB over Hesr

Poor

Bay County, Michigan · 1.5 MI W of Bay City · Structure no. 000000000000624

Built
1960
65 years old, rebuilt 2001
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
139 ft
3 main spans
Daily traffic
44,350
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Hesr is a steel stringer/multi-beam or girder carrying I-75 NB over Hesr in Bay County, Michigan. It was built in 1960 and reconstructed in 2001, so it is 65 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 44,350 vehicles a day, roughly 9% of them trucks, projected to reach 49,000 by 2044. The structure is 139 ft (42.4 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 NB
CrossesHesr
Location1.5 MI W of Bay City
RouteInterstate 75
CountyBay County
StateMichigan
Coordinates43.60602, -83.94772
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length139 ft (42.4 m)
Longest span46 ft (14.1 m)
Deck width73 ft (22.1 m)
Roadway width69 ft (21.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,350 (2024)
Projected traffic49,000 by 2044
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 NB over Hesr built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2001.

What condition is I-75 NB over Hesr in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does I-75 NB over Hesr carry?

About 44,350 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is I-75 NB over Hesr?

The structure is 139 ft (42.4 m) long with a longest span of 46 ft (14.1 m) and a deck 73 ft wide.

Who owns I-75 NB over Hesr?

It is owned by the State Highway Agency.