US Bridges

SR 18 over Strong River

Good

Rankin County, Mississippi · 2.1 MI E SR 13 · Structure no. 310001806109420

Built
1975
50 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
362 ft
1 main span
Daily traffic
2,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Strong River is a prestressed concrete stringer/multi-beam or girder carrying SR 18 over Strong River in Rankin County, Mississippi. It was built in 1975, so it is 50 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 2,600 vehicles a day, roughly 14% of them trucks, projected to reach 3,100 by 2043. The structure is 362 ft (110.3 m) long and 42 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

CarriesSR 18
CrossesStrong River
Location2.1 MI E SR 13
RouteState Highway 18
Coordinates32.06373, -89.74759
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating33.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadHS 20
Structure length362 ft (110.3 m)
Longest span60 ft (18.3 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic3,100 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 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 Strong River built?

It was built in 1975, making it 50 years old in 2025.

What condition is SR 18 over Strong River 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 Strong River carry?

About 2,600 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 18 over Strong River?

The structure is 362 ft (110.3 m) long with a longest span of 60 ft (18.3 m) and a deck 42 ft wide.

Who owns SR 18 over Strong River?

It is owned by the State Highway Agency.