US Bridges

Fairgrove Road over Allen Extension Drain

Fair

Tuscola County, Michigan · Sec 15-22 Fairgrove Twp · Structure no. 000000000010469

Built
1971
54 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
1,650
2009 count
Owner
County
County Highway Agency

About this bridge

Fairgrove Road over Allen Extension Drain is a prestressed concrete box beam or girders - multiple carrying Fairgrove Road over Allen Extension Drain in Tuscola County, Michigan. It was built in 1971, so it is 54 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 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 1,650 vehicles a day, projected to reach 2,980 by 2029. The structure is 26 ft (7.9 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFairgrove Road
CrossesAllen Extension Drain
LocationSec 15-22 Fairgrove Twp
RouteCounty Highway 7970
CountyTuscola County
StateMichigan
Coordinates43.52381, -83.5075
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.2 US tons
Inventory rating49.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.5 m)
Deck width36 ft (11.1 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2009)
Projected traffic2,980 by 2029
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 Fairgrove Road over Allen Extension Drain built?

It was built in 1971, making it 54 years old in 2025.

What condition is Fairgrove Road over Allen Extension Drain 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 May 2023.

How much traffic does Fairgrove Road over Allen Extension Drain carry?

About 1,650 vehicles per day (2009 count).

How long is Fairgrove Road over Allen Extension Drain?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.5 m) and a deck 36 ft wide.

Who owns Fairgrove Road over Allen Extension Drain?

It is owned by the County Highway Agency.