US Bridges

Dennison RD over N DR Mid Br Macon R

Good

Monroe County, Michigan · 1.25 MI N of M 50 · Structure no. 000000000007249

Built
2011
14 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
430
2015 count
Owner
County
County Highway Agency

About this bridge

Dennison RD over N DR Mid Br Macon R is a prestressed concrete box beam or girders - multiple carrying Dennison RD over N DR Mid Br Macon R in Monroe County, Michigan. It was built in 2011, so it is 14 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 430 vehicles a day, roughly 14% of them trucks, projected to reach 495 by 2035. The structure is 62 ft (18.9 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesDennison RD
CrossesN DR Mid Br Macon R
Location1.25 MI N of M 50
RouteCounty Highway 5809
Coordinates41.98667, -83.73192
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating77.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length62 ft (18.9 m)
Longest span61 ft (18.5 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic430 (2015)
Projected traffic495 by 2035
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dennison RD over N DR Mid Br Macon R built?

It was built in 2011, making it 14 years old in 2025.

What condition is Dennison RD over N DR Mid Br Macon R 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 May 2023.

How much traffic does Dennison RD over N DR Mid Br Macon R carry?

About 430 vehicles per day (2015 count), of which roughly 14% are trucks.

How long is Dennison RD over N DR Mid Br Macon R?

The structure is 62 ft (18.9 m) long with a longest span of 61 ft (18.5 m) and a deck 31 ft wide.

Who owns Dennison RD over N DR Mid Br Macon R?

It is owned by the County Highway Agency.