US Bridges

SR 490 over Big Slough Tributary

Fair

Winston County, Mississippi · 6.8 MI E SR 15 · Structure no. 310049008000680

Built
1992
33 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
770
2023 count
Owner
State
State Highway Agency

About this bridge

SR 490 over Big Slough Tributary is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 490 over Big Slough Tributary in Winston County, Mississippi. It was built in 1992, so it is 33 years old, younger 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 770 vehicles a day, roughly 11% of them trucks, projected to reach 770 by 2043. The structure is 122 ft (37.1 m) long and 31 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesSR 490
CrossesBig Slough Tributary
Location6.8 MI E SR 15
RouteState Highway 490
CountyWinston County
StateMississippi
Coordinates32.97688, -88.95779
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.1 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2023)
Projected traffic770 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 490 over Big Slough Tributary built?

It was built in 1992, making it 33 years old in 2025.

What condition is SR 490 over Big Slough Tributary 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 April 2024.

How much traffic does SR 490 over Big Slough Tributary carry?

About 770 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 490 over Big Slough Tributary?

The structure is 122 ft (37.1 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns SR 490 over Big Slough Tributary?

It is owned by the State Highway Agency.