US Bridges

Fdr 120 over Panther Bayou

Poor

Grant Parish, Louisiana · No Data Entered · Structure no. 080601000002120

Built
1981
44 years old, rebuilt 1998
Condition
Poor
inspected December 2024
Type
Channel Beam
Prestressed Concrete
Length
133 ft
7 main spans
Daily traffic
15
1979 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 120 over Panther Bayou is a prestressed concrete channel beam carrying Fdr 120 over Panther Bayou in Grant Parish, Louisiana. It was built in 1981 and reconstructed in 1998, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 15 vehicles a day, projected to reach 100 by 2010. The structure is 133 ft (40.5 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
LocationNo Data Entered
RouteFederal Lands Road 120.6
CountyGrant Parish
StateLouisiana
Coordinates31.65403, -92.4798
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 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 alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans7
Design loadHS 20
Structure length133 ft (40.5 m)
Longest span19 ft (5.8 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (1979)
Projected traffic100 by 2010
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$24 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 120 over Panther Bayou built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 1998.

What condition is Fdr 120 over Panther Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Fdr 120 over Panther Bayou carry?

About 15 vehicles per day (1979 count).

How long is Fdr 120 over Panther Bayou?

The structure is 133 ft (40.5 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?

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