US Bridges

SR 585 over Unnamed Stream

Fair

Walthall County, Mississippi · 3.8 MI N US 98 · Structure no. 310058507400380

Built
1974
51 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
4 main spans
Daily traffic
410
2023 count
Owner
State
State Highway Agency

About this bridge

SR 585 over Unnamed Stream is a prestressed concrete stringer/multi-beam or girder carrying SR 585 over Unnamed Stream in Walthall County, Mississippi. It was built in 1974, so it is 51 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 6 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 410 vehicles a day, roughly 11% of them trucks, projected to reach 410 by 2043. The structure is 160 ft (48.8 m) long and 29 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesSR 585
CrossesUnnamed Stream
Location3.8 MI N US 98
RouteState Highway 585
CountyWalthall County
StateMississippi
Coordinates31.19439, -90.07074
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating50 US tons
Inventory rating23.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length160 ft (48.8 m)
Longest span40 ft (12.2 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic410 (2023)
Projected traffic410 by 2043
Trucks11%
Lanes on structure20
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 585 over Unnamed Stream built?

It was built in 1974, making it 51 years old in 2025.

What condition is SR 585 over Unnamed Stream 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 August 2024.

How much traffic does SR 585 over Unnamed Stream carry?

About 410 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 585 over Unnamed Stream?

The structure is 160 ft (48.8 m) long with a longest span of 40 ft (12.2 m) and a deck 29 ft wide.

Who owns SR 585 over Unnamed Stream?

It is owned by the State Highway Agency.