US Bridges

I181 Rt LN over Rock Springs Rd.

Good

Sullivan County, Tennessee · 3.60 Mi.N.Of Washington · Structure no. 82I00260018

Built
1968
57 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
176 ft
3 main spans
Daily traffic
41,117
2021 count
Owner
State
State Highway Agency

About this bridge

I181 Rt LN over Rock Springs Rd. is a prestressed concrete continuous stringer/multi-beam or girder carrying I181 Rt LN over Rock Springs Rd. in Sullivan County, Tennessee. It was built in 1968, so it is 57 years old, older 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 41,117 vehicles a day, roughly 6% of them trucks, projected to reach 65,787 by 2042. The structure is 176 ft (53.6 m) long and 42 ft wide.

CarriesI181 Rt LN
CrossesRock Springs Rd.
Location3.60 Mi.N.Of Washington
RouteInterstate 26
Coordinates36.47333, -82.54334
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating42.5 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length176 ft (53.6 m)
Longest span64 ft (19.4 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,117 (2021)
Projected traffic65,787 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I181 Rt LN over Rock Springs Rd. built?

It was built in 1968, making it 57 years old in 2025.

What condition is I181 Rt LN over Rock Springs Rd. 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 August 2024.

How much traffic does I181 Rt LN over Rock Springs Rd. carry?

About 41,117 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I181 Rt LN over Rock Springs Rd.?

The structure is 176 ft (53.6 m) long with a longest span of 64 ft (19.4 m) and a deck 42 ft wide.

Who owns I181 Rt LN over Rock Springs Rd.?

It is owned by the State Highway Agency.