US Bridges

Deerfield Road over Siloam Bayou

Fair

Adams County, Mississippi · Sec 35 T 5N R 1W B · Structure no. SA0100000000009

Built
1975
50 years old
Condition
Fair
inspected October 2024
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

Deerfield Road over Siloam Bayou is a concrete channel beam carrying Deerfield Road over Siloam Bayou in Adams County, Mississippi. It was built in 1975, so it is 50 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 100 vehicles a day, projected to reach 150 by 2042. The structure is 31 ft (9.4 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesDeerfield Road
CrossesSiloam Bayou
LocationSec 35 T 5N R 1W B
RouteCounty Highway 1
CountyAdams County
StateMississippi
Coordinates31.37409, -91.20144
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.6 US tons
Inventory rating49.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic150 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$230,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Deerfield Road over Siloam Bayou built?

It was built in 1975, making it 50 years old in 2025.

What condition is Deerfield Road over Siloam Bayou 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 October 2024.

How much traffic does Deerfield Road over Siloam Bayou carry?

About 100 vehicles per day (2022 count).

How long is Deerfield Road over Siloam Bayou?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Deerfield Road over Siloam Bayou?

It is owned by the County Highway Agency.