US Bridges

Sterling Road over I-75 NB

Poor

Arenac County, Michigan · 2.0 MI W of Sterling · Structure no. 000000000000426

Built
1968
57 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
383 ft
6 main spans
Daily traffic
14,350
2002 count
Owner
State
State Highway Agency

About this bridge

Sterling Road over I-75 NB is a prestressed concrete stringer/multi-beam or girder carrying Sterling Road over I-75 NB in Arenac County, Michigan. It was built in 1968, so it is 57 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 14,350 vehicles a day, roughly 13% of them trucks, projected to reach 18,450 by 2024. The structure is 383 ft (116.7 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesSterling Road
CrossesI-75 NB
Location2.0 MI W of Sterling
RouteCounty Highway 0
CountyArenac County
StateMichigan
Coordinates44.03324, -84.05725
Functional classRural Major Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length383 ft (116.7 m)
Longest span70 ft (21.4 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,350 (2002)
Projected traffic18,450 by 2024
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Sterling Road over I-75 NB built?

It was built in 1968, making it 57 years old in 2025.

What condition is Sterling Road over I-75 NB 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 2024.

How much traffic does Sterling Road over I-75 NB carry?

About 14,350 vehicles per day (2002 count), of which roughly 13% are trucks.

How long is Sterling Road over I-75 NB?

The structure is 383 ft (116.7 m) long with a longest span of 70 ft (21.4 m) and a deck 32 ft wide.

Who owns Sterling Road over I-75 NB?

It is owned by the State Highway Agency.