US Bridges

Froberg Road over Sturgeon River

Fair

Baraga County, Michigan · 7.5 MI NW of Baraga · Structure no. 000000000000506

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
170 ft
3 main spans
Daily traffic
105
2014 count
Owner
County
County Highway Agency

About this bridge

Froberg Road over Sturgeon River is a steel stringer/multi-beam or girder carrying Froberg Road over Sturgeon River in Baraga County, Michigan. It was built in 1978, so it is 47 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 105 vehicles a day, roughly 5% of them trucks, projected to reach 240 by 2034. The structure is 170 ft (51.8 m) long and 32 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesFroberg Road
CrossesSturgeon River
Location7.5 MI NW of Baraga
RouteCounty Highway 723
CountyBaraga County
StateMichigan
Coordinates46.83708, -88.59041
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span72 ft (22 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2014)
Projected traffic240 by 2034
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$400 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Froberg Road over Sturgeon River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Froberg Road over Sturgeon River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Froberg Road over Sturgeon River carry?

About 105 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is Froberg Road over Sturgeon River?

The structure is 170 ft (51.8 m) long with a longest span of 72 ft (22 m) and a deck 32 ft wide.

Who owns Froberg Road over Sturgeon River?

It is owned by the County Highway Agency.