US Bridges

I 55 over Union Street

Good

Lincoln County, Mississippi · 4.6 MI N US 84 · Structure no. 11000550430419A

Built
1966
59 years old
Condition
Good
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
283 ft
4 main spans
Daily traffic
11,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 55 over Union Street is a prestressed concrete stringer/multi-beam or girder carrying I 55 over Union Street in Lincoln County, Mississippi. It was built in 1966, so it is 59 years old, older than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,500 vehicles a day, roughly 29% of them trucks, projected to reach 13,500 by 2043. The structure is 283 ft (86.3 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 55
CrossesUnion Street
Location4.6 MI N US 84
RouteInterstate 55
CountyLincoln County
StateMississippi
Coordinates31.60586, -90.46578
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating37.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length283 ft (86.3 m)
Longest span70 ft (21.3 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,500 (2023)
Projected traffic13,500 by 2043
Trucks29%
Lanes on structure20
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$425 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 55 over Union Street built?

It was built in 1966, making it 59 years old in 2025.

What condition is I 55 over Union Street 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 February 2025.

How much traffic does I 55 over Union Street carry?

About 11,500 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is I 55 over Union Street?

The structure is 283 ft (86.3 m) long with a longest span of 70 ft (21.3 m) and a deck 45 ft wide.

Who owns I 55 over Union Street?

It is owned by the State Highway Agency.