US Bridges

21 Mile Road over North Br Clinton River

Fair

Macomb County, Michigan · 0.1 MI West of North Ave · Structure no. 000000000012655

Built
1996
29 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
224 ft
4 main spans
Daily traffic
18,841
2022 count
Owner
County
County Highway Agency

About this bridge

21 Mile Road over North Br Clinton River is a prestressed concrete stringer/multi-beam or girder carrying 21 Mile Road over North Br Clinton River in Macomb County, Michigan. It was built in 1996, so it is 29 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 18,841 vehicles a day, roughly 3% of them trucks, projected to reach 20,500 by 2041. The structure is 224 ft (68.3 m) long and 78 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries21 Mile Road
CrossesNorth Br Clinton River
Location0.1 MI West of North Ave
RouteCounty Highway 0
CountyMacomb County
StateMichigan
Coordinates42.6442, -82.87823
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length224 ft (68.3 m)
Longest span53 ft (16.3 m)
Deck width78 ft (23.9 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,841 (2022)
Projected traffic20,500 by 2041
Trucks3%
Lanes on structure5
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

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 21 Mile Road over North Br Clinton River built?

It was built in 1996, making it 29 years old in 2025.

What condition is 21 Mile Road over North Br Clinton 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 2024.

How much traffic does 21 Mile Road over North Br Clinton River carry?

About 18,841 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 21 Mile Road over North Br Clinton River?

The structure is 224 ft (68.3 m) long with a longest span of 53 ft (16.3 m) and a deck 78 ft wide.

Who owns 21 Mile Road over North Br Clinton River?

It is owned by the County Highway Agency.