US Bridges

I155 over Mississippi River

Fair

Dyer County, Tennessee · S 11 T 17 N R 13 E · Structure no. 23I01550001

Built
1975
50 years old, rebuilt 1987
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel Continuous
Length
7,102 ft
2 main spans
Daily traffic
11,561
2021 count
Owner
State
State Highway Agency

About this bridge

I155 over Mississippi River is a steel continuous truss - thru carrying I155 over Mississippi River in Dyer County, Tennessee. It was built in 1975 and reconstructed in 1987, so it is 50 years old, older 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 11,561 vehicles a day, roughly 8% of them trucks, projected to reach 18,117 by 2042. The structure is 7,102 ft (2,164.7 m) long and 81 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesI155
CrossesMississippi River
LocationS 11 T 17 N R 13 E
RouteInterstate 155
CountyDyer County
StateTennessee
Coordinates36.11833, -89.615
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating31.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+57 approach)
Design loadHS 20 + Mod
Structure length7,102 ft (2,164.7 m)
Longest span919 ft (280.1 m)
Deck width81 ft (24.7 m)
Roadway width79 ft (24.1 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic11,561 (2021)
Projected traffic18,117 by 2042
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$648.2 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I155 over Mississippi River built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1987.

What condition is I155 over Mississippi River 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 October 2023.

How much traffic does I155 over Mississippi River carry?

About 11,561 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is I155 over Mississippi River?

The structure is 7,102 ft (2,164.7 m) long with a longest span of 919 ft (280.1 m) and a deck 81 ft wide.

Who owns I155 over Mississippi River?

It is owned by the State Highway Agency.