US Bridges

County Road 121 over I 22

Good

Union County, Mississippi · 4.0 MI E SR 15 · Structure no. 410007807307000

Built
1979
46 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
421 ft
4 main spans
Daily traffic
220
2023 count
Owner
State
State Highway Agency

About this bridge

County Road 121 over I 22 is a prestressed concrete continuous stringer/multi-beam or girder carrying County Road 121 over I 22 in Union County, Mississippi. It was built in 1979, so it is 46 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 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 220 vehicles a day, roughly 8% of them trucks, projected to reach 230 by 2043. The structure is 421 ft (128.2 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty Road 121
CrossesI 22
Location4.0 MI E SR 15
RouteCounty Highway 0
CountyUnion County
StateMississippi
Coordinates34.42911, -88.96025
Functional classRural Local

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.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length421 ft (128.2 m)
Longest span110 ft (33.5 m)
Deck width29 ft (8.9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic220 (2023)
Projected traffic230 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$538 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 121 over I 22 built?

It was built in 1979, making it 46 years old in 2025.

What condition is County Road 121 over I 22 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 December 2023.

How much traffic does County Road 121 over I 22 carry?

About 220 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is County Road 121 over I 22?

The structure is 421 ft (128.2 m) long with a longest span of 110 ft (33.5 m) and a deck 29 ft wide.

Who owns County Road 121 over I 22?

It is owned by the State Highway Agency.