US Bridges

Nfa A770 over Centenary Creek

Fair

Blount County, Tennessee · 7 M. Sw. Maryville. · Structure no. 050A7700001

Built
1902
123 years old
Condition
Fair
inspected December 2023
Type
Arch - Deck
Concrete
Length
33 ft
1 main span
Daily traffic
80
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A770 over Centenary Creek is a concrete arch - deck carrying Nfa A770 over Centenary Creek in Blount County, Tennessee. It was built in 1902, so it is 123 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 80 vehicles a day, roughly 2% of them trucks, projected to reach 128 by 2042. The structure is 33 ft (10.2 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A770
CrossesCentenary Creek
Location7 M. Sw. Maryville.
RouteCounty Highway 770
CountyBlount County
StateTennessee
Coordinates35.66408, -84.04587
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.2 m)
Longest span31 ft (9.4 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic128 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 A770 over Centenary Creek built?

It was built in 1902, making it 123 years old in 2025.

What condition is Nfa A770 over Centenary Creek 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 December 2023.

How much traffic does Nfa A770 over Centenary Creek carry?

About 80 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A770 over Centenary Creek?

The structure is 33 ft (10.2 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.

Who owns Nfa A770 over Centenary Creek?

It is owned by the County Highway Agency.