US Bridges

Fdr 120 over Panther Bayou Trib.

Fair

Grant Parish, Louisiana · No Data Entered · Structure no. 080601000002122

Built
1981
44 years old, rebuilt 2018
Condition
Fair
inspected September 2024
Type
Channel Beam
Prestressed Concrete
Length
57 ft
3 main spans
Daily traffic
15
1979 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 120 over Panther Bayou Trib. is a prestressed concrete channel beam carrying Fdr 120 over Panther Bayou Trib. in Grant Parish, Louisiana. It was built in 1981 and reconstructed in 2018, so it is 44 years old, older than the Louisiana average of 43 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 15 vehicles a day, projected to reach 22 by 2045. The structure is 57 ft (17.4 m) long and 17 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFdr 120
CrossesPanther Bayou Trib.
LocationNo Data Entered
RouteFederal Lands Road 120.7
CountyGrant Parish
StateLouisiana
Coordinates31.65697, -92.4817
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (1979)
Projected traffic22 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 120 over Panther Bayou Trib. built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2018.

What condition is Fdr 120 over Panther Bayou Trib. 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 Fdr 120 over Panther Bayou Trib. carry?

About 15 vehicles per day (1979 count).

How long is Fdr 120 over Panther Bayou Trib.?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 17 ft wide.

Who owns Fdr 120 over Panther Bayou Trib.?

It is owned by the U.S. Forest Service.