US Bridges

Mound Bayou Road over Sunflower River

Good

Sunflower County, Mississippi · Sec 9 T23N R 4W B · Structure no. SA6700000000146

Built
1968
57 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
420 ft
7 main spans
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

Mound Bayou Road over Sunflower River is a prestressed concrete stringer/multi-beam or girder carrying Mound Bayou Road over Sunflower River in Sunflower County, Mississippi. It was built in 1968, so it is 57 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 40 vehicles a day, roughly 8% of them trucks, projected to reach 60 by 2044. The structure is 420 ft (128 m) long and 29 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesMound Bayou Road
CrossesSunflower River
LocationSec 9 T23N R 4W B
RouteCounty Highway 1611
Coordinates33.88254, -90.61153
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45.4 US tons
Inventory rating22.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length420 ft (128 m)
Longest span60 ft (18.3 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic60 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$2.2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mound Bayou Road over Sunflower River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Mound Bayou Road over Sunflower 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 Mound Bayou Road over Sunflower River carry?

About 40 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Mound Bayou Road over Sunflower River?

The structure is 420 ft (128 m) long with a longest span of 60 ft (18.3 m) and a deck 29 ft wide.

Who owns Mound Bayou Road over Sunflower River?

It is owned by the County Highway Agency.