US Bridges

FAS 104 over Bayou Portage

Fair

Harrison County, Mississippi · Sec 14 T 8S R13W B · Structure no. SA2400000000167

Built
2004
21 years old
Condition
Fair
inspected November 2023
Type
Movable - Bascule
Steel
Length
1,372 ft
1 main span
Daily traffic
4,000
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 104 over Bayou Portage is a steel movable - bascule carrying FAS 104 over Bayou Portage in Harrison County, Mississippi. It was built in 2004, so it is 21 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 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 4,000 vehicles a day, roughly 8% of them trucks, projected to reach 6,000 by 2044. The structure is 1,372 ft (418.1 m) long and 38 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFAS 104
CrossesBayou Portage
LocationSec 14 T 8S R13W B
RouteCounty Highway 104
CountyHarrison County
StateMississippi
Coordinates30.34232, -89.26443
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+20 approach)
Design loadHS 20
Structure length1,372 ft (418.1 m)
Longest span131 ft (40 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deck95 ft (29 m)

Traffic and service

Average daily traffic4,000 (2024)
Projected traffic6,000 by 2044
Trucks8%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$16 million (2024 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was FAS 104 over Bayou Portage built?

It was built in 2004, making it 21 years old in 2025.

What condition is FAS 104 over Bayou Portage 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 November 2023.

How much traffic does FAS 104 over Bayou Portage carry?

About 4,000 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is FAS 104 over Bayou Portage?

The structure is 1,372 ft (418.1 m) long with a longest span of 131 ft (40 m) and a deck 38 ft wide.

Who owns FAS 104 over Bayou Portage?

It is owned by the County Highway Agency.