US Bridges

LA0471 over Summerfield Branch

Fair

Grant Parish, Louisiana · 1.22 MI North of US 71 · Structure no. 082201230101221

Built
1954
71 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
38 ft
2 main spans
Daily traffic
432
2021 count
Owner
State
State Highway Agency

About this bridge

LA0471 over Summerfield Branch is a wood or timber stringer/multi-beam or girder carrying LA0471 over Summerfield Branch in Grant Parish, Louisiana. It was built in 1954, so it is 71 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 432 vehicles a day, roughly 14% of them trucks, projected to reach 475 by 2041. The structure is 38 ft (11.6 m) long and 23 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLA0471
CrossesSummerfield Branch
Location1.22 MI North of US 71
RouteState Highway 471
CountyGrant Parish
StateLouisiana
Coordinates31.58171, -92.722
Functional classRural Minor Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 10
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic432 (2021)
Projected traffic475 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$229,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0471 over Summerfield Branch built?

It was built in 1954, making it 71 years old in 2025.

What condition is LA0471 over Summerfield 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 July 2024.

How much traffic does LA0471 over Summerfield Branch carry?

About 432 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0471 over Summerfield Branch?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 23 ft wide.

Who owns LA0471 over Summerfield Branch?

It is owned by the State Highway Agency.