US Bridges

Imperial Hts Road over Spurr River

Good

Baraga County, Michigan · 1 MI S of Michigamme · Structure no. 000000000000502

Built
1987
38 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
1 main span
Daily traffic
237
2014 count
Owner
County
County Highway Agency

About this bridge

Imperial Hts Road over Spurr River is a steel stringer/multi-beam or girder carrying Imperial Hts Road over Spurr River in Baraga County, Michigan. It was built in 1987, so it is 38 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 237 vehicles a day, roughly 7% of them trucks, projected to reach 300 by 2034. The structure is 80 ft (24.3 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesImperial Hts Road
CrossesSpurr River
Location1 MI S of Michigamme
RouteCounty Highway 785
CountyBaraga County
StateMichigan
Coordinates46.52568, -88.12327
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating87.2 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length80 ft (24.3 m)
Longest span74 ft (22.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic237 (2014)
Projected traffic300 by 2034
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Imperial Hts Road over Spurr River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Imperial Hts Road over Spurr River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Imperial Hts Road over Spurr River carry?

About 237 vehicles per day (2014 count), of which roughly 7% are trucks.

How long is Imperial Hts Road over Spurr River?

The structure is 80 ft (24.3 m) long with a longest span of 74 ft (22.6 m) and a deck 32 ft wide.

Who owns Imperial Hts Road over Spurr River?

It is owned by the County Highway Agency.