US Bridges

Fdr 120 over Gray Branch

Fair

Grant Parish, Louisiana · No Data Entered · Structure no. 080601000002117

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Prestressed Concrete
Length
52 ft
3 main spans
Daily traffic
28
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 120 over Gray Branch is a prestressed concrete channel beam carrying Fdr 120 over Gray Branch in Grant Parish, Louisiana. It was built in 1970, so it is 55 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 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 28 vehicles a day, projected to reach 42 by 2045. The structure is 52 ft (15.8 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesFdr 120
CrossesGray Branch
LocationNo Data Entered
RouteFederal Lands Road 120.4
CountyGrant Parish
StateLouisiana
Coordinates31.63766, -92.46686
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating21.1 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span17 ft (5.3 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (—)
Projected traffic42 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 120 over Gray Branch built?

It was built in 1970, making it 55 years old in 2025.

What condition is Fdr 120 over Gray Branch 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 Gray Branch carry?

About 28 vehicles per day (latest count).

How long is Fdr 120 over Gray Branch?

The structure is 52 ft (15.8 m) long with a longest span of 17 ft (5.3 m) and a deck 25 ft wide.

Who owns Fdr 120 over Gray Branch?

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