US Bridges

I 55 over Cnic RR

Good

Lincoln County, Mississippi · 2.8 MI N US 84 · Structure no. 11000550430403B

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

About this bridge

I 55 over Cnic RR is a prestressed concrete stringer/multi-beam or girder carrying I 55 over Cnic RR 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 183 ft (55.8 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 55
CrossesCnic RR
Location2.8 MI N US 84
RouteInterstate 55
Coordinates31.58203, -90.47307
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.6 US tons
Inventory rating27.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length183 ft (55.8 m)
Longest span60 ft (18.3 m)
Deck width48 ft (14.6 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,500 (2023)
Projected traffic13,500 by 2043
Trucks29%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 55 over Cnic RR built?

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

What condition is I 55 over Cnic RR 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 January 2025.

How much traffic does I 55 over Cnic RR carry?

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

How long is I 55 over Cnic RR?

The structure is 183 ft (55.8 m) long with a longest span of 60 ft (18.3 m) and a deck 48 ft wide.

Who owns I 55 over Cnic RR?

It is owned by the State Highway Agency.