US Bridges

10th Street over Black River

Fair

St. Clair County, Michigan · In Port Huron · Structure no. 000000000010257

Built
1957
68 years old, rebuilt 2002
Condition
Fair
inspected October 2024
Type
Movable - Bascule
Steel
Length
375 ft
1 main span
Daily traffic
15,710
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

10th Street over Black River is a steel movable - bascule carrying 10th Street over Black River in St. Clair County, Michigan. It was built in 1957 and reconstructed in 2002, so it is 68 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 5 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 15,710 vehicles a day, roughly 8% of them trucks, projected to reach 18,852 by 2037. The structure is 375 ft (114.3 m) long and 57 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries10th Street
CrossesBlack River
LocationIn Port Huron
RouteCity Street 2012
CountySt. Clair County
StateMichigan
Coordinates42.98053, -82.43352
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+2 approach)
Design loadHS 20
Structure length375 ft (114.3 m)
Longest span190 ft (57.9 m)
Deck width57 ft (17.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,710 (2017)
Projected traffic18,852 by 2037
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.5 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was 10th Street over Black River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2002.

What condition is 10th Street 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 October 2024.

How much traffic does 10th Street over Black River carry?

About 15,710 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is 10th Street over Black River?

The structure is 375 ft (114.3 m) long with a longest span of 190 ft (57.9 m) and a deck 57 ft wide.

Who owns 10th Street over Black River?

It is owned by the City or Municipal Highway Agency.