US Bridges

I40 over Mulherrin Crk.&new Mid.R

Good

Smith County, Tennessee · In Smith Co. · Structure no. 80I00400007

Built
1963
62 years old, rebuilt 1991
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
201 ft
3 main spans
Daily traffic
45,338
2021 count
Owner
State
State Highway Agency

About this bridge

I40 over Mulherrin Crk.&new Mid.R is a steel continuous stringer/multi-beam or girder carrying I40 over Mulherrin Crk.&new Mid.R in Smith County, Tennessee. It was built in 1963 and reconstructed in 1991, so it is 62 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 45,338 vehicles a day, roughly 7% of them trucks, projected to reach 65,798 by 2041. The structure is 201 ft (61.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI40
CrossesMulherrin Crk.&new Mid.R
LocationIn Smith Co.
RouteInterstate 40
CountySmith County
StateTennessee
Coordinates36.17755, -86.00446
Functional classRural 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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length201 ft (61.3 m)
Longest span66 ft (20.1 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,338 (2021)
Projected traffic65,798 by 2041
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I40 over Mulherrin Crk.&new Mid.R built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1991.

What condition is I40 over Mulherrin Crk.&new Mid.R 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 May 2023.

How much traffic does I40 over Mulherrin Crk.&new Mid.R carry?

About 45,338 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I40 over Mulherrin Crk.&new Mid.R?

The structure is 201 ft (61.3 m) long with a longest span of 66 ft (20.1 m) and a deck 44 ft wide.

Who owns I40 over Mulherrin Crk.&new Mid.R?

It is owned by the State Highway Agency.