US Bridges

Norman Road over Black River

Fair

St. Clair County, Michigan · SEC.29-32 Grant Twp. · Structure no. 000000000010074

Built
1935
90 years old, rebuilt 1982
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
2 main spans
Daily traffic
310
2012 count
Owner
County
County Highway Agency

About this bridge

Norman Road over Black River is a steel stringer/multi-beam or girder carrying Norman Road over Black River in St. Clair County, Michigan. It was built in 1935 and reconstructed in 1982, so it is 90 years old, older 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 310 vehicles a day, roughly 8% of them trucks, projected to reach 375 by 2032. The structure is 150 ft (45.7 m) long and 26 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesNorman Road
CrossesBlack River
LocationSEC.29-32 Grant Twp.
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.09253, -82.61797
Functional classRural Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating100.8 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span73 ft (22.3 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic310 (2012)
Projected traffic375 by 2032
Trucks8%
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 Norman Road over Black River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1982.

What condition is Norman Road over Black 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 August 2023.

How much traffic does Norman Road over Black River carry?

About 310 vehicles per day (2012 count), of which roughly 8% are trucks.

How long is Norman Road over Black River?

The structure is 150 ft (45.7 m) long with a longest span of 73 ft (22.3 m) and a deck 26 ft wide.

Who owns Norman Road over Black River?

It is owned by the County Highway Agency.