US Bridges

SR 503 over I 20

Fair

Newton County, Mississippi · SR 503 over I 20 · Structure no. 310050305103280

Built
1960
65 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
281 ft
4 main spans
Daily traffic
1,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR 503 over I 20 is a concrete continuous tee beam carrying SR 503 over I 20 in Newton 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 1,600 vehicles a day, roughly 11% of them trucks, projected to reach 1,600 by 2043. The structure is 281 ft (85.6 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 503
CrossesI 20
LocationSR 503 over I 20
RouteState Highway 503
CountyNewton County
StateMississippi
Coordinates32.34437, -89.04415
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length281 ft (85.6 m)
Longest span82 ft (25 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2023)
Projected traffic1,600 by 2043
Trucks11%
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$250 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 503 over I 20 built?

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

What condition is SR 503 over I 20 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 2025.

How much traffic does SR 503 over I 20 carry?

About 1,600 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 503 over I 20?

The structure is 281 ft (85.6 m) long with a longest span of 82 ft (25 m) and a deck 32 ft wide.

Who owns SR 503 over I 20?

It is owned by the State Highway Agency.