US Bridges

NB Mound RD over Plum Brook Drain

Good

Macomb County, Michigan · 0.3 MI N of 18 Mile RD · Structure no. 000000000006244

Built
1992
33 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
24,262
2022 count
Owner
County
County Highway Agency

About this bridge

NB Mound RD over Plum Brook Drain is a prestressed concrete stringer/multi-beam or girder carrying NB Mound RD over Plum Brook Drain in Macomb County, Michigan. It was built in 1992, so it is 33 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 24,262 vehicles a day, roughly 3% of them trucks. The structure is 34 ft (10.4 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB Mound RD
CrossesPlum Brook Drain
Location0.3 MI N of 18 Mile RD
RouteCounty Highway 0
Coordinates42.59768, -83.05058
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
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 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 rating89 US tons
Inventory rating54.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length34 ft (10.4 m)
Longest span31 ft (9.5 m)
Deck width57 ft (17.5 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,262 (2022)
Projected traffic—
Trucks3%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB Mound RD over Plum Brook Drain built?

It was built in 1992, making it 33 years old in 2025.

What condition is NB Mound RD over Plum Brook Drain 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 July 2024.

How much traffic does NB Mound RD over Plum Brook Drain carry?

About 24,262 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is NB Mound RD over Plum Brook Drain?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.5 m) and a deck 57 ft wide.

Who owns NB Mound RD over Plum Brook Drain?

It is owned by the County Highway Agency.