US Bridges

Cannonsburg Road over Lum Bayou

Good

Jefferson County, Mississippi · Sec 4 T 8N R 1W B · Structure no. SA3200000000001

Built
1997
28 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
213 ft
5 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

Cannonsburg Road over Lum Bayou is a prestressed concrete stringer/multi-beam or girder carrying Cannonsburg Road over Lum Bayou in Jefferson County, Mississippi. It was built in 1997, so it is 28 years old, younger than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 8% of them trucks, projected to reach 150 by 2043. The structure is 213 ft (64.9 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCannonsburg Road
CrossesLum Bayou
LocationSec 4 T 8N R 1W B
RouteCounty Highway 75
Coordinates31.69458, -91.18811
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.1 US tons
Inventory rating31 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length213 ft (64.9 m)
Longest span80 ft (24.4 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$996,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cannonsburg Road over Lum Bayou built?

It was built in 1997, making it 28 years old in 2025.

What condition is Cannonsburg Road over Lum Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Cannonsburg Road over Lum Bayou carry?

About 100 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Cannonsburg Road over Lum Bayou?

The structure is 213 ft (64.9 m) long with a longest span of 80 ft (24.4 m) and a deck 29 ft wide.

Who owns Cannonsburg Road over Lum Bayou?

It is owned by the County Highway Agency.