US Bridges

SR 18 over Natchez Trace

Fair

Claiborne County, Mississippi · 1.3 MI E US 61 · Structure no. 310001801100130

Built
1963
62 years old
Condition
Fair
inspected August 2024
Type
Arch - Deck
Concrete
Length
85 ft
1 main span
Daily traffic
2,700
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Natchez Trace is a concrete arch - deck carrying SR 18 over Natchez Trace in Claiborne County, Mississippi. It was built in 1963, so it is 62 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 6 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 2,700 vehicles a day, roughly 13% of them trucks, projected to reach 2,700 by 2043. The structure is 85 ft (25.9 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSR 18
CrossesNatchez Trace
Location1.3 MI E US 61
RouteState Highway 18
Coordinates31.96564, -90.95799
Functional classRural Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span85 ft (25.9 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2023)
Projected traffic2,700 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 18 over Natchez Trace built?

It was built in 1963, making it 62 years old in 2025.

What condition is SR 18 over Natchez Trace 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 August 2024.

How much traffic does SR 18 over Natchez Trace carry?

About 2,700 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 18 over Natchez Trace?

The structure is 85 ft (25.9 m) long with a longest span of 85 ft (25.9 m) and a deck 34 ft wide.

Who owns SR 18 over Natchez Trace?

It is owned by the State Highway Agency.