US Bridges

Nfa A178 over East Rock Creek

Good

Marshall County, Tennessee · 3.9 MI SE JCT SR50&SR271 · Structure no. 590A1780001

Built
2006
19 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
38 ft
2 main spans
Daily traffic
40
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A178 over East Rock Creek is a concrete continuous culvert carrying Nfa A178 over East Rock Creek in Marshall County, Tennessee. It was built in 2006, so it is 19 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 40 vehicles a day, roughly 3% of them trucks, projected to reach 64 by 2040. The structure is 38 ft (11.6 m) long and 28 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesNfa A178
CrossesEast Rock Creek
Location3.9 MI SE JCT SR50&SR271
RouteCounty Highway 178
Coordinates35.39741, -86.64083
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span18 ft (5.5 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic64 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 A178 over East Rock Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is Nfa A178 over East Rock 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 July 2024.

How much traffic does Nfa A178 over East Rock Creek carry?

About 40 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Nfa A178 over East Rock Creek?

The structure is 38 ft (11.6 m) long with a longest span of 18 ft (5.5 m) and a deck 28 ft wide.

Who owns Nfa A178 over East Rock Creek?

It is owned by the County Highway Agency.