US Bridges

I 55 over Cnic RR

Fair

Yalobusha County, Mississippi · 3.2 MI N Grenada Cl · Structure no. 11000550812171A

Built
1960
65 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
364 ft
2 main spans
Daily traffic
8,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 55 over Cnic RR is a steel stringer/multi-beam or girder carrying I 55 over Cnic RR in Yalobusha County, Mississippi. It was built in 1960, so it is 65 years old, older than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 8,500 vehicles a day, roughly 31% of them trucks, projected to reach 8,500 by 2043. The structure is 364 ft (110.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 55
CrossesCnic RR
Location3.2 MI N Grenada Cl
RouteInterstate 55
CountyYalobusha County
StateMississippi
Coordinates33.9442, -89.86691
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating33.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+5 approach)
Design loadHS 20 + Mod
Structure length364 ft (110.9 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,500 (2023)
Projected traffic8,500 by 2043
Trucks31%
Lanes on structure2
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$360 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 55 over Cnic RR built?

It was built in 1960, making it 65 years old in 2025.

What condition is I 55 over Cnic RR 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 January 2024.

How much traffic does I 55 over Cnic RR carry?

About 8,500 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I 55 over Cnic RR?

The structure is 364 ft (110.9 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns I 55 over Cnic RR?

It is owned by the State Highway Agency.