US Bridges

Nfa A429 over Dark Shrum Branch

Good

Macon County, Tennessee · 4.5 M SE of Lafayette · Structure no. 560A4290001

Built
1983
42 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
46 ft
2 main spans
Daily traffic
30
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A429 over Dark Shrum Branch is a concrete continuous culvert carrying Nfa A429 over Dark Shrum Branch in Macon County, Tennessee. It was built in 1983, so it is 42 years old, younger than the Tennessee average of 47.4 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.

It carries about 30 vehicles a day, roughly 2% of them trucks, projected to reach 48 by 2041. The structure is 46 ft (14 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesNfa A429
CrossesDark Shrum Branch
Location4.5 M SE of Lafayette
RouteCounty Highway 429
Coordinates36.47352, -85.97532
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating28.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length46 ft (14 m)
Longest span15 ft (4.6 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2020)
Projected traffic48 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A429 over Dark Shrum Branch built?

It was built in 1983, making it 42 years old in 2025.

What condition is Nfa A429 over Dark Shrum Branch 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 September 2023.

How much traffic does Nfa A429 over Dark Shrum Branch carry?

About 30 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A429 over Dark Shrum Branch?

The structure is 46 ft (14 m) long with a longest span of 15 ft (4.6 m) and a deck 27 ft wide.

Who owns Nfa A429 over Dark Shrum Branch?

It is owned by the County Highway Agency.