US Bridges

Mills-Macon HWY over Macon River

Good

Lenawee County, Michigan · 0.3 MI N of Pennington · Structure no. 000000000005655

Built
1988
37 years old
Condition
Good
inspected January 2025
Type
Slab
Wood or Timber
Length
26 ft
1 main span
Daily traffic
40
2011 count
Owner
County
County Highway Agency

About this bridge

Mills-Macon HWY over Macon River is a wood or timber slab carrying Mills-Macon HWY over Macon River in Lenawee County, Michigan. It was built in 1988, so it is 37 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2025. The structure is 26 ft (7.9 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMills-Macon HWY
CrossesMacon River
Location0.3 MI N of Pennington
RouteCounty Highway 0
Coordinates42.05619, -83.85122
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.4 US tons
Inventory rating36.5 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2011)
Projected traffic150 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Mills-Macon HWY over Macon River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Mills-Macon 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 January 2025.

How much traffic does Mills-Macon HWY over Macon River carry?

About 40 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Mills-Macon HWY over Macon River?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 25 ft wide.

Who owns Mills-Macon HWY over Macon River?

It is owned by the County Highway Agency.