US Bridges

Fdr 570 over Saline Bayou Trib.

Fair

Natchitoches Parish, Louisiana · Strange Road · Structure no. 080604000002478

Built
1968
57 years old
Condition
Fair
inspected February 2025
Type
Channel Beam
Prestressed Concrete
Length
46 ft
3 main spans
Daily traffic
30
1976 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 570 over Saline Bayou Trib. is a prestressed concrete channel beam carrying Fdr 570 over Saline Bayou Trib. in Natchitoches Parish, Louisiana. It was built in 1968, so it is 57 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 30 vehicles a day, projected to reach 45 by 2045. The structure is 46 ft (14 m) long and 25 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesFdr 570
CrossesSaline Bayou Trib.
LocationStrange Road
RouteFederal Lands Road 570.2
CountyNatchitoches Parish
StateLouisiana
Coordinates32.07314, -92.93866
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 inspectionFebruary 2025
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating22.2 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length46 ft (14 m)
Longest span16 ft (4.9 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (1976)
Projected traffic45 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 570 over Saline Bayou Trib. built?

It was built in 1968, making it 57 years old in 2025.

What condition is Fdr 570 over Saline 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 February 2025.

How much traffic does Fdr 570 over Saline Bayou Trib. carry?

About 30 vehicles per day (1976 count).

How long is Fdr 570 over Saline Bayou Trib.?

The structure is 46 ft (14 m) long with a longest span of 16 ft (4.9 m) and a deck 25 ft wide.

Who owns Fdr 570 over Saline Bayou Trib.?

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