US Bridges

Tharp Road over Tupper Bayou

FairPosted for load

Humphreys County, Mississippi · Sec 24 T16N R 4W B · Structure no. SA2700000000090

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Concrete
Length
39 ft
200 main spans
Daily traffic
140
2021 count
Owner
County
County Highway Agency

About this bridge

Tharp Road over Tupper Bayou is a concrete channel beam carrying Tharp Road over Tupper Bayou in Humphreys 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 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 140 vehicles a day, roughly 8% of them trucks, projected to reach 210 by 2043. The structure is 39 ft (12 m) long and 26 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesTharp Road
CrossesTupper Bayou
LocationSec 24 T16N R 4W B
RouteCounty Highway 1641
CountyHumphreys County
StateMississippi
Coordinates33.21576, -90.57272
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.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.9 US tons
Inventory rating24.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans200
Design loadH 15
Structure length39 ft (12 m)
Longest span20 ft (6 m)
Deck width26 ft (8 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2021)
Projected traffic210 by 2043
Trucks8%
Lanes on structure20
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$127,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Tharp Road over Tupper Bayou built?

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

What condition is Tharp Road over Tupper 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 September 2024.

How much traffic does Tharp Road over Tupper Bayou carry?

About 140 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Tharp Road over Tupper Bayou?

The structure is 39 ft (12 m) long with a longest span of 20 ft (6 m) and a deck 26 ft wide.

Who owns Tharp Road over Tupper Bayou?

It is owned by the County Highway Agency.