US Bridges

I40 Rmp over I40-EB Rmp / 21st. St.

Good

Knox County, Tennessee · In Knoxville · Structure no. 47I00400127

Built
1981
44 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
142 ft
3 main spans
Daily traffic
139,697
2021 count
Owner
State
State Highway Agency

About this bridge

I40 Rmp over I40-EB Rmp / 21st. St. is a prestressed concrete box beam or girders - single or spread carrying I40 Rmp over I40-EB Rmp / 21st. St. in Knox County, Tennessee. It was built in 1981, so it is 44 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 139,697 vehicles a day, roughly 6% of them trucks, projected to reach 27,552 by 2041. The structure is 142 ft (43.4 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesI40 Rmp
CrossesI40-EB Rmp / 21st. St.
LocationIn Knoxville
RouteInterstate 40
CountyKnox County
StateTennessee
Coordinates35.96247, -83.94302
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length142 ft (43.4 m)
Longest span64 ft (19.4 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic139,697 (2021)
Projected traffic27,552 by 2041
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1 million (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 Rmp over I40-EB Rmp / 21st. St. built?

It was built in 1981, making it 44 years old in 2025.

What condition is I40 Rmp over I40-EB Rmp / 21st. St. 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 October 2024.

How much traffic does I40 Rmp over I40-EB Rmp / 21st. St. carry?

About 139,697 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I40 Rmp over I40-EB Rmp / 21st. St.?

The structure is 142 ft (43.4 m) long with a longest span of 64 ft (19.4 m) and a deck 32 ft wide.

Who owns I40 Rmp over I40-EB Rmp / 21st. St.?

It is owned by the State Highway Agency.