US Bridges

SR 18 over Ditch

Good

Rankin County, Mississippi · 12.6 MI E SR 468 · Structure no. 310001806108620

Built
1946
79 years old, rebuilt 1982
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
5,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Ditch is a concrete culvert carrying SR 18 over Ditch in Rankin County, Mississippi. It was built in 1946 and reconstructed in 1982, so it is 79 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 5,000 vehicles a day, roughly 13% of them trucks, projected to reach 5,900 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 31.7 mi (51 km).

CarriesSR 18
CrossesDitch
Location12.6 MI E SR 468
RouteState Highway 18
Coordinates32.13591, -89.8492
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating25.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic5,900 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 over Ditch built?

It was built in 1946, making it 79 years old in 2025. It was reconstructed in 1982.

What condition is SR 18 over Ditch 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 October 2024.

How much traffic does SR 18 over Ditch carry?

About 5,000 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 18 over Ditch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns SR 18 over Ditch?

It is owned by the State Highway Agency.