US Bridges

Isola Road over Jackson Bayou

Good

Humphreys County, Mississippi · Sec 22 T16N R 3W B · Structure no. SA270000000A081

Built
2022
3 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
650
2023 count
Owner
County
County Highway Agency

About this bridge

Isola Road over Jackson Bayou is a concrete culvert carrying Isola Road over Jackson Bayou in Humphreys County, Mississippi. It was built in 2022, so it is 3 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 650 vehicles a day, roughly 8% of them trucks, projected to reach 975 by 2035. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIsola Road
CrossesJackson Bayou
LocationSec 22 T16N R 3W B
RouteCounty Highway 1640
CountyHumphreys County
StateMississippi
Coordinates33.22704, -90.50144
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.7 US tons
Inventory rating72.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length22 ft (6.8 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2023)
Projected traffic975 by 2035
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Isola Road over Jackson Bayou built?

It was built in 2022, making it 3 years old in 2025.

What condition is Isola Road over Jackson 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 April 2023.

How much traffic does Isola Road over Jackson Bayou carry?

About 650 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Isola Road over Jackson Bayou?

The structure is 22 ft (6.8 m) long with a longest span of 20 ft (6.1 m).

Who owns Isola Road over Jackson Bayou?

It is owned by the County Highway Agency.