US Bridges

SR 12 over Sunflower River

PoorPosted for load

Washington County, Mississippi · Washington/Humphreys Cl · Structure no. 310001207602390

Built
1940
85 years old
Condition
Poor
inspected May 2024
Type
Truss - Thru
Steel
Length
572 ft
2 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

SR 12 over Sunflower River is a steel truss - thru carrying SR 12 over Sunflower River in Washington County, Mississippi. It was built in 1940, so it is 85 years old, older than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,200 vehicles a day, roughly 25% of them trucks, projected to reach 2,200 by 2043. The structure is 572 ft (174.3 m) long and 26 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

Open in Google Maps
CarriesSR 12
CrossesSunflower River
LocationWashington/Humphreys Cl
RouteState Highway 12
CountyWashington County
StateMississippi
Coordinates33.18399, -90.68682
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadH 15
Structure length572 ft (174.3 m)
Longest span150 ft (45.7 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic2,200 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 12 over Sunflower River built?

It was built in 1940, making it 85 years old in 2025.

What condition is SR 12 over Sunflower River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does SR 12 over Sunflower River carry?

About 2,200 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is SR 12 over Sunflower River?

The structure is 572 ft (174.3 m) long with a longest span of 150 ft (45.7 m) and a deck 26 ft wide.

Who owns SR 12 over Sunflower River?

It is owned by the State Highway Agency.