US Bridges

Lower Bay Road over Mulatto Bayou

Fair

Hancock County, Mississippi · Sec 18 T 9S R15W B · Structure no. SA2300000000059

Built
2009
16 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
1,248
2021 count
Owner
County
County Highway Agency

About this bridge

Lower Bay Road over Mulatto Bayou is a concrete culvert carrying Lower Bay Road over Mulatto Bayou in Hancock County, Mississippi. It was built in 2009, so it is 16 years old, younger 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.

It carries about 1,248 vehicles a day, roughly 8% of them trucks, projected to reach 1,872 by 2041. The structure is 29 ft (8.8 m) long and 40 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesLower Bay Road
CrossesMulatto Bayou
LocationSec 18 T 9S R15W B
RouteCounty Highway 1106
CountyHancock County
StateMississippi
Coordinates30.25688, -89.53804
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating53.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width40 ft (12.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,248 (2021)
Projected traffic1,872 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Bay Road over Mulatto Bayou built?

It was built in 2009, making it 16 years old in 2025.

What condition is Lower Bay Road over Mulatto 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 2023.

How much traffic does Lower Bay Road over Mulatto Bayou carry?

About 1,248 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Lower Bay Road over Mulatto Bayou?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 40 ft wide.

Who owns Lower Bay Road over Mulatto Bayou?

It is owned by the County Highway Agency.