US Bridges

I 840 over I840/GARRISON CR

Fair

Williamson County, Tennessee · 1 MI S SR46 · Structure no. 94SR8400022

Built
2012
13 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
414 ft
3 main spans
Daily traffic
22,556
2021 count
Owner
State
State Highway Agency

About this bridge

I 840 over I840/GARRISON CR is a prestressed concrete continuous stringer/multi-beam or girder carrying I 840 over I840/GARRISON CR in Williamson County, Tennessee. It was built in 2012, so it is 13 years old, younger 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 22,556 vehicles a day, roughly 7% of them trucks, projected to reach 34,176 by 2041. The structure is 414 ft (126.2 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesI 840
CrossesI840/GARRISON CR
Location1 MI S SR46
RouteInterstate 840
CountyWilliamson County
StateTennessee
Coordinates35.8599, -87.08263
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length414 ft (126.2 m)
Longest span138 ft (42.1 m)
Deck width43 ft (13.2 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,556 (2021)
Projected traffic34,176 by 2041
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 840 over I840/GARRISON CR built?

It was built in 2012, making it 13 years old in 2025.

What condition is I 840 over I840/GARRISON CR 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 December 2024.

How much traffic does I 840 over I840/GARRISON CR carry?

About 22,556 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I 840 over I840/GARRISON CR?

The structure is 414 ft (126.2 m) long with a longest span of 138 ft (42.1 m) and a deck 43 ft wide.

Who owns I 840 over I840/GARRISON CR?

It is owned by the State Highway Agency.