US Bridges

M-33|ALGER RD over I-75 NB

Poor

Arenac County, Michigan · 1.0 MI N of Alger · Structure no. 000000000000427

Built
1968
57 years old
Condition
Poor
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
379 ft
6 main spans
Daily traffic
4,124
2007 count
Owner
State
State Highway Agency

About this bridge

M-33|ALGER RD over I-75 NB is a prestressed concrete stringer/multi-beam or girder carrying M-33|ALGER RD 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.

It carries about 4,124 vehicles a day, roughly 9% of them trucks, projected to reach 5,381 by 2018. The structure is 379 ft (115.6 m) long and 49 ft wide.

Location

Open in Google Maps
CarriesM-33|ALGER RD
CrossesI-75 NB
Location1.0 MI N of Alger
RouteState Highway 33
CountyArenac County
StateMichigan
Coordinates44.13167, -84.13115
Functional classRural Minor Arterial

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2025
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length379 ft (115.6 m)
Longest span73 ft (22.3 m)
Deck width49 ft (14.8 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,124 (2007)
Projected traffic5,381 by 2018
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 M-33|ALGER RD over I-75 NB built?

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

What condition is M-33|ALGER RD 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 February 2025.

How much traffic does M-33|ALGER RD over I-75 NB carry?

About 4,124 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is M-33|ALGER RD over I-75 NB?

The structure is 379 ft (115.6 m) long with a longest span of 73 ft (22.3 m) and a deck 49 ft wide.

Who owns M-33|ALGER RD over I-75 NB?

It is owned by the State Highway Agency.