US Bridges

Reed Road over Porter Creek

GoodPosted for load

Shiawassee County, Michigan · 2.3 MI SW of New Lothrop · Structure no. 000000000009841

Built
1981
44 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
105
1992 count
Owner
County
County Highway Agency

About this bridge

Reed Road over Porter Creek is a prestressed concrete box beam or girders - multiple carrying Reed Road over Porter Creek in Shiawassee County, Michigan. It was built in 1981, so it is 44 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 105 vehicles a day, roughly 5% of them trucks, projected to reach 190 by 2012. 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).

CarriesReed Road
CrossesPorter Creek
Location2.3 MI SW of New Lothrop
RouteCounty Highway 0
Coordinates43.09593, -84.00702
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating52.1 US tons
Inventory rating31.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length55 ft (16.7 m)
Longest span51 ft (15.5 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (1992)
Projected traffic190 by 2012
Trucks5%
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 Reed Road over Porter Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Reed Road over Porter Creek 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 October 2024.

How much traffic does Reed Road over Porter Creek carry?

About 105 vehicles per day (1992 count), of which roughly 5% are trucks.

How long is Reed Road over Porter Creek?

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 Reed Road over Porter Creek?

It is owned by the County Highway Agency.