US Bridges

Britton HWY over Macon River

Fair

Lenawee County, Michigan · 0.5 MI North of Welch RD · Structure no. 000000000005605

Built
1989
36 years old
Condition
Fair
inspected February 2025
Type
Slab
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
1,130
2011 count
Owner
County
County Highway Agency

About this bridge

Britton HWY over Macon River is a wood or timber slab carrying Britton HWY over Macon River in Lenawee County, Michigan. It was built in 1989, so it is 36 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 1,130 vehicles a day, roughly 2% of them trucks, projected to reach 2,500 by 2031. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesBritton HWY
CrossesMacon River
Location0.5 MI North of Welch RD
RouteCounty Highway 4685
CountyLenawee County
StateMichigan
Coordinates42.0469, -83.83146
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.2 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,130 (2011)
Projected traffic2,500 by 2031
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Britton HWY over Macon River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Britton HWY over Macon 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 February 2025.

How much traffic does Britton HWY over Macon River carry?

About 1,130 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Britton HWY over Macon River?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns Britton HWY over Macon River?

It is owned by the County Highway Agency.