US Bridges

I840 over I840-LL / SR 106

Good

Williamson County, Tennessee · 0.6MI W Jct. I65&SR840 · Structure no. 94SR8400058

Built
2001
24 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
174 ft
3 main spans
Daily traffic
30,377
2021 count
Owner
State
State Highway Agency

About this bridge

I840 over I840-LL / SR 106 is a prestressed concrete continuous stringer/multi-beam or girder carrying I840 over I840-LL / SR 106 in Williamson County, Tennessee. It was built in 2001, so it is 24 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 30,377 vehicles a day, roughly 7% of them trucks, projected to reach 41,246 by 2041. The structure is 174 ft (52.9 m) long and 52 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesI840
CrossesI840-LL / SR 106
Location0.6MI W Jct. I65&SR840
RouteInterstate 840
Coordinates35.82167, -86.85122
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length174 ft (52.9 m)
Longest span103 ft (31.4 m)
Deck width52 ft (15.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,377 (2021)
Projected traffic41,246 by 2041
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I840 over I840-LL / SR 106 built?

It was built in 2001, making it 24 years old in 2025.

What condition is I840 over I840-LL / SR 106 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 March 2023.

How much traffic does I840 over I840-LL / SR 106 carry?

About 30,377 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I840 over I840-LL / SR 106?

The structure is 174 ft (52.9 m) long with a longest span of 103 ft (31.4 m) and a deck 52 ft wide.

Who owns I840 over I840-LL / SR 106?

It is owned by the State Highway Agency.