US Bridges

Blackmore RD over Grants Bayou West Fork

FairPosted for load

West Feliciana Parish, Louisiana · 0.2 M N of LA 965 · Structure no. 616330473912031

Built
1999
26 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
3 main spans
Daily traffic
78
2022 count
Owner
County
County Highway Agency

About this bridge

Blackmore RD over Grants Bayou West Fork is a steel stringer/multi-beam or girder carrying Blackmore RD over Grants Bayou West Fork in West Feliciana Parish, Louisiana. It was built in 1999, so it is 26 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 78 vehicles a day, projected to reach 85 by 2042. The structure is 80 ft (24.4 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesBlackmore RD
CrossesGrants Bayou West Fork
Location0.2 M N of LA 965
RouteCounty Highway 0
CountyWest Feliciana Parish
StateLouisiana
Coordinates30.78781, -91.33973
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating6.8 US tons
Inventory rating5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span40 ft (12.2 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78 (2022)
Projected traffic85 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$288,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Blackmore RD over Grants Bayou West Fork built?

It was built in 1999, making it 26 years old in 2025.

What condition is Blackmore RD over Grants Bayou West Fork 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 Blackmore RD over Grants Bayou West Fork carry?

About 78 vehicles per day (2022 count).

How long is Blackmore RD over Grants Bayou West Fork?

The structure is 80 ft (24.4 m) long with a longest span of 40 ft (12.2 m) and a deck 20 ft wide.

Who owns Blackmore RD over Grants Bayou West Fork?

It is owned by the County Highway Agency.