US Bridges

US29 US70 I85B Lp over Michael Branch

Fair

Davidson County, North Carolina · .5 Mi. N. Jct. SR1147 · Structure no. 000000000570065

Built
1950
75 years old, rebuilt 1993
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
34 ft
3 main spans
Daily traffic
34,500
2020 count
Owner
State
State Highway Agency

About this bridge

US29 US70 I85B Lp over Michael Branch is a concrete continuous culvert carrying US29 US70 I85B Lp over Michael Branch in Davidson County, North Carolina. It was built in 1950 and reconstructed in 1993, so it is 75 years old, older than the North Carolina average of 38.7 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 34,500 vehicles a day, roughly 16% of them trucks, projected to reach 69,000 by 2040. The structure is 34 ft (10.3 m) long.

Location

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CarriesUS29 US70 I85B Lp
CrossesMichael Branch
Location.5 Mi. N. Jct. SR1147
RouteInterstate 85
CountyDavidson County
StateNorth Carolina
Coordinates35.80797, -80.28898
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating34.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length34 ft (10.3 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,500 (2020)
Projected traffic69,000 by 2040
Trucks16%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US29 US70 I85B Lp over Michael Branch built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1993.

What condition is US29 US70 I85B Lp over Michael Branch 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 March 2023.

How much traffic does US29 US70 I85B Lp over Michael Branch carry?

About 34,500 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is US29 US70 I85B Lp over Michael Branch?

The structure is 34 ft (10.3 m) long with a longest span of 11 ft (3.3 m).

Who owns US29 US70 I85B Lp over Michael Branch?

It is owned by the State Highway Agency.