US Bridges

Clark Bridge Road over Black River

Fair

Cheboygan County, Michigan · Sec 29 T33NR1E · Structure no. 000000000001546

Built
1987
38 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
230
2005 count
Owner
County
County Highway Agency

About this bridge

Clark Bridge Road over Black River is a prestressed concrete box beam or girders - multiple carrying Clark Bridge Road over Black River in Cheboygan 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 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 230 vehicles a day, projected to reach 410 by 2025. The structure is 64 ft (19.5 m) long and 31 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesClark Bridge Road
CrossesBlack River
LocationSec 29 T33NR1E
RouteCounty Highway 0
Coordinates45.2243, -84.331
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.1 US tons
Inventory rating44 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length64 ft (19.5 m)
Longest span64 ft (19.5 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2005)
Projected traffic410 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 Clark Bridge Road over Black River built?

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

What condition is Clark Bridge 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 July 2023.

How much traffic does Clark Bridge Road over Black River carry?

About 230 vehicles per day (2005 count).

How long is Clark Bridge Road over Black River?

The structure is 64 ft (19.5 m) long with a longest span of 64 ft (19.5 m) and a deck 31 ft wide.

Who owns Clark Bridge Road over Black River?

It is owned by the County Highway Agency.