US Bridges

Fdr 558 over School House Branch

Fair

Grant Parish, Louisiana · Logmi 0.41 FR 569 to · Structure no. 080604000002452

Built
1965
60 years old
Condition
Fair
inspected October 2022
Type
Channel Beam
Prestressed Concrete
Length
52 ft
3 main spans
Daily traffic
34
1979 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 558 over School House Branch is a prestressed concrete channel beam carrying Fdr 558 over School House Branch in Grant Parish, Louisiana. It was built in 1965, so it is 60 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 34 vehicles a day, projected to reach 51 by 2045. The structure is 52 ft (15.8 m) long and 17 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFdr 558
CrossesSchool House Branch
LocationLogmi 0.41 FR 569 to
RouteFederal Lands Road 558
CountyGrant Parish
StateLouisiana
Coordinates31.71654, -92.61365
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2022
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 geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.8 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 width17 ft (5.1 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (1979)
Projected traffic51 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 558 over School House Branch built?

It was built in 1965, making it 60 years old in 2025.

What condition is Fdr 558 over School House 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 October 2022.

How much traffic does Fdr 558 over School House Branch carry?

About 34 vehicles per day (1979 count).

How long is Fdr 558 over School House Branch?

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

Who owns Fdr 558 over School House Branch?

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