US Bridges

Morton Marathon RD over Leaf River

Fair

Scott County, Mississippi · Sec 36 T 5N R 8E B · Structure no. SA6200000000028

Built
1962
63 years old
Condition
Fair
inspected February 2023
Type
Channel Beam
Concrete
Length
228 ft
12 main spans
Daily traffic
280
2017 count
Owner
County
County Highway Agency

About this bridge

Morton Marathon RD over Leaf River is a concrete channel beam carrying Morton Marathon RD over Leaf River in Scott County, Mississippi. It was built in 1962, so it is 63 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 280 vehicles a day, roughly 8% of them trucks, projected to reach 420 by 2040. The structure is 228 ft (69.5 m) long and 25 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesMorton Marathon RD
CrossesLeaf River
LocationSec 36 T 5N R 8E B
RouteCounty Highway 484
CountyScott County
StateMississippi
Coordinates32.22611, -89.42383
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans12
Design loadHS 20
Structure length228 ft (69.5 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.5 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2017)
Projected traffic420 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$910,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Morton Marathon RD over Leaf River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Morton Marathon RD over Leaf River 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 February 2023.

How much traffic does Morton Marathon RD over Leaf River carry?

About 280 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is Morton Marathon RD over Leaf River?

The structure is 228 ft (69.5 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Morton Marathon RD over Leaf River?

It is owned by the County Highway Agency.