US Bridges

Nfa B322 over Rock Springs Branch

Fair

Sullivan County, Tennessee · N of SR137-SE of Kingspor · Structure no. 820B3220001

Built
1975
50 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
225
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa B322 over Rock Springs Branch is a prestressed concrete box beam or girders - multiple carrying Nfa B322 over Rock Springs Branch in Sullivan County, Tennessee. It was built in 1975, so it is 50 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 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 225 vehicles a day, roughly 2% of them trucks, projected to reach 360 by 2042. The structure is 23 ft (6.9 m) long and 18 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNfa B322
CrossesRock Springs Branch
LocationN of SR137-SE of Kingspor
RouteCounty Highway 322
CountySullivan County
StateTennessee
Coordinates36.4793, -82.53941
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span22 ft (6.6 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2020)
Projected traffic360 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$128,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa B322 over Rock Springs Branch built?

It was built in 1975, making it 50 years old in 2025.

What condition is Nfa B322 over Rock Springs 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 January 2024.

How much traffic does Nfa B322 over Rock Springs Branch carry?

About 225 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa B322 over Rock Springs Branch?

The structure is 23 ft (6.9 m) long with a longest span of 22 ft (6.6 m) and a deck 18 ft wide.

Who owns Nfa B322 over Rock Springs Branch?

It is owned by the County Highway Agency.