US Bridges

Silo Road over Drainage Canal

FairPosted for load

Panola County, Mississippi · Sec_ 4_T 8S_R 9W · Structure no. SA5400000000090

Built
1977
48 years old
Condition
Fair
inspected November 2024
Type
Girder and Floorbeam System
Steel
Length
47 ft
1 main span
Daily traffic
100
2021 count
Owner
County
County Highway Agency

About this bridge

Silo Road over Drainage Canal is a steel girder and floorbeam system carrying Silo Road over Drainage Canal in Panola County, Mississippi. It was built in 1977, so it is 48 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 8% of them trucks, projected to reach 150 by 2043. The structure is 47 ft (14.3 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSilo Road
CrossesDrainage Canal
LocationSec_ 4_T 8S_R 9W
RouteCounty Highway 179
CountyPanola County
StateMississippi
Coordinates34.42306, -90.15386
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11.7 US tons
Inventory rating8.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length47 ft (14.3 m)
Longest span45 ft (13.7 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic150 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$337,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Silo Road over Drainage Canal built?

It was built in 1977, making it 48 years old in 2025.

What condition is Silo Road over Drainage Canal 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 November 2024.

How much traffic does Silo Road over Drainage Canal carry?

About 100 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Silo Road over Drainage Canal?

The structure is 47 ft (14.3 m) long with a longest span of 45 ft (13.7 m) and a deck 20 ft wide.

Who owns Silo Road over Drainage Canal?

It is owned by the County Highway Agency.