US Bridges

Salzburg RD over M-47

Poor

Bay County, Michigan · 1.0 MI S of US-10 · Structure no. 000000000000651

Built
1966
59 years old
Condition
Poor
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
181 ft
4 main spans
Daily traffic
2,670
1997 count
Owner
State
State Highway Agency

About this bridge

Salzburg RD over M-47 is a prestressed concrete stringer/multi-beam or girder carrying Salzburg RD over M-47 in Bay County, Michigan. It was built in 1966, so it is 59 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 2,670 vehicles a day, roughly 3% of them trucks, projected to reach 9,999 by 1977. The structure is 181 ft (55.1 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesSalzburg RD
CrossesM-47
Location1.0 MI S of US-10
RouteCounty Highway 2015
CountyBay County
StateMichigan
Coordinates43.58281, -84.13942
Functional classUrban 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.7 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length181 ft (55.1 m)
Longest span60 ft (18.2 m)
Deck width32 ft (9.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,670 (1997)
Projected traffic9,999 by 1977
Trucks3%
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 Salzburg RD over M-47 built?

It was built in 1966, making it 59 years old in 2025.

What condition is Salzburg RD over M-47 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 Salzburg RD over M-47 carry?

About 2,670 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Salzburg RD over M-47?

The structure is 181 ft (55.1 m) long with a longest span of 60 ft (18.2 m) and a deck 32 ft wide.

Who owns Salzburg RD over M-47?

It is owned by the State Highway Agency.