US Bridges

Nfa C520 over Cold Springs Branch

Good

Sullivan County, Tennessee · N Off US11W · Structure no. 820C5200005

Built
1984
41 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
250
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa C520 over Cold Springs Branch is a prestressed concrete box beam or girders - multiple carrying Nfa C520 over Cold Springs Branch in Sullivan County, Tennessee. It was built in 1984, so it is 41 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 250 vehicles a day, roughly 2% of them trucks, projected to reach 400 by 2042. The structure is 23 ft (6.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNfa C520
CrossesCold Springs Branch
LocationN Off US11W
RouteCounty Highway 520
Coordinates36.58288, -82.38278
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 protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2020)
Projected traffic400 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 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 Nfa C520 over Cold Springs Branch built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa C520 over Cold Springs 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 January 2024.

How much traffic does Nfa C520 over Cold Springs Branch carry?

About 250 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa C520 over Cold Springs Branch?

The structure is 23 ft (6.9 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns Nfa C520 over Cold Springs Branch?

It is owned by the County Highway Agency.