US Bridges

Ridge HWY over Macon River

Good

Lenawee County, Michigan · West of Britton HWY · Structure no. 000000000005602

Built
1997
28 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
49 ft
1 main span
Daily traffic
5,309
2011 count
Owner
County
County Highway Agency

About this bridge

Ridge HWY over Macon River is a prestressed concrete box beam or girders - multiple carrying Ridge HWY over Macon River in Lenawee County, Michigan. It was built in 1997, so it is 28 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 5,309 vehicles a day, roughly 3% of them trucks, projected to reach 7,500 by 2031. The structure is 49 ft (14.9 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesRidge HWY
CrossesMacon River
LocationWest of Britton HWY
RouteCounty Highway 4675
Coordinates42.02199, -83.83532
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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating61 US tons
Inventory rating36.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span45 ft (13.7 m)
Deck width34 ft (10.5 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,309 (2011)
Projected traffic7,500 by 2031
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Ridge HWY over Macon River built?

It was built in 1997, making it 28 years old in 2025.

What condition is Ridge HWY over Macon River 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 February 2025.

How much traffic does Ridge HWY over Macon River carry?

About 5,309 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Ridge HWY over Macon River?

The structure is 49 ft (14.9 m) long with a longest span of 45 ft (13.7 m) and a deck 34 ft wide.

Who owns Ridge HWY over Macon River?

It is owned by the County Highway Agency.