US Bridges

Morton Marathon RD over Robinson Creek

Good

Scott County, Mississippi · Sec 17 T 5N R 7E B · Structure no. SA6200000000015

Built
1976
49 years old
Condition
Good
inspected October 2024
Type
Channel Beam
Concrete
Length
95 ft
5 main spans
Daily traffic
410
2024 count
Owner
County
County Highway Agency

About this bridge

Morton Marathon RD over Robinson Creek is a concrete channel beam carrying Morton Marathon RD over Robinson Creek in Scott County, Mississippi. It was built in 1976, so it is 49 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 410 vehicles a day, roughly 8% of them trucks, projected to reach 550 by 2045. The structure is 95 ft (29 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMorton Marathon RD
CrossesRobinson Creek
LocationSec 17 T 5N R 7E B
RouteCounty Highway 484
Coordinates32.27258, -89.59664
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadH 15
Structure length95 ft (29 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic410 (2024)
Projected traffic550 by 2045
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$470,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Morton Marathon RD over Robinson Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Morton Marathon RD over Robinson Creek 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 Morton Marathon RD over Robinson Creek carry?

About 410 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Morton Marathon RD over Robinson Creek?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Morton Marathon RD over Robinson Creek?

It is owned by the County Highway Agency.