US Bridges

Birnwick RD over Wolf Creek

FairPosted for load

Lenawee County, Michigan · 0.2 MI E of Tipton HWY · Structure no. 000000000005618

Built
1966
59 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
120
2001 count
Owner
County
County Highway Agency

About this bridge

Birnwick RD over Wolf Creek is a prestressed concrete box beam or girders - multiple carrying Birnwick RD over Wolf Creek in Lenawee County, Michigan. It was built in 1966, so it is 59 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 120 vehicles a day, projected to reach 180 by 2031. The structure is 40 ft (12.2 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesBirnwick RD
CrossesWolf Creek
Location0.2 MI E of Tipton HWY
RouteCounty Highway 0
CountyLenawee County
StateMichigan
Coordinates41.91849, -84.05939
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.9 US tons
Inventory rating15.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span38 ft (11.5 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2001)
Projected traffic180 by 2031
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Birnwick RD over Wolf Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Birnwick RD over Wolf Creek 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 April 2024.

How much traffic does Birnwick RD over Wolf Creek carry?

About 120 vehicles per day (2001 count).

How long is Birnwick RD over Wolf Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.5 m) and a deck 24 ft wide.

Who owns Birnwick RD over Wolf Creek?

It is owned by the County Highway Agency.