US Bridges

Grisby RD over Trib to Flat Lick Bayou

PoorPosted for load

Webster Parish, Louisiana · 1.88 Mi. E. of La. 1 · Structure no. 046032473931431

Built
1979
46 years old
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
3 main spans
Daily traffic
37
2020 count
Owner
County
County Highway Agency

About this bridge

Grisby RD over Trib to Flat Lick Bayou is a wood or timber stringer/multi-beam or girder carrying Grisby RD over Trib to Flat Lick Bayou in Webster Parish, Louisiana. It was built in 1979, so it is 46 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 37 vehicles a day, projected to reach 40 by 2040. The structure is 58 ft (17.7 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesGrisby RD
CrossesTrib to Flat Lick Bayou
Location1.88 Mi. E. of La. 1
RouteCounty Highway 0
Coordinates32.78812, -93.23916
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating13.8 US tons
Inventory rating10 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 10
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width23 ft (7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37 (2020)
Projected traffic40 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$220,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Grisby RD over Trib to Flat Lick Bayou built?

It was built in 1979, making it 46 years old in 2025.

What condition is Grisby RD over Trib to Flat Lick Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does Grisby RD over Trib to Flat Lick Bayou carry?

About 37 vehicles per day (2020 count).

How long is Grisby RD over Trib to Flat Lick Bayou?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 23 ft wide.

Who owns Grisby RD over Trib to Flat Lick Bayou?

It is owned by the County Highway Agency.