US Bridges

Kniffin RD over Middle Br of Macon River

Fair

Lenawee County, Michigan · 0.5 MI W of N County Line · Structure no. 000000000005690

Built
1995
30 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
28
2011 count
Owner
County
County Highway Agency

About this bridge

Kniffin RD over Middle Br of Macon River is a prestressed concrete box beam or girders - multiple carrying Kniffin RD over Middle Br of Macon River in Lenawee County, Michigan. It was built in 1995, so it is 30 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 28 vehicles a day, projected to reach 110 by 2031. The structure is 55 ft (16.7 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesKniffin RD
CrossesMiddle Br of Macon River
Location0.5 MI W of N County Line
RouteCounty Highway 0
CountyLenawee County
StateMichigan
Coordinates41.99508, -83.78034
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.8 US tons
Inventory rating51.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length55 ft (16.7 m)
Longest span51 ft (15.5 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2011)
Projected traffic110 by 2031
Trucks0%
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 Kniffin RD over Middle Br of Macon River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Kniffin RD over Middle Br of 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 January 2025.

How much traffic does Kniffin RD over Middle Br of Macon River carry?

About 28 vehicles per day (2011 count).

How long is Kniffin RD over Middle Br of Macon River?

The structure is 55 ft (16.7 m) long with a longest span of 51 ft (15.5 m) and a deck 31 ft wide.

Who owns Kniffin RD over Middle Br of Macon River?

It is owned by the County Highway Agency.