US Bridges

Royal 18th DR over Creek

FairPosted for load

St. Tammany Parish, Louisiana · Royal 18 Estates Sub · Structure no. 625230203894911

Built
1990
35 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
3 main spans
Daily traffic
200
1989 count
Owner
County
County Highway Agency

About this bridge

Royal 18th DR over Creek is a steel stringer/multi-beam or girder carrying Royal 18th DR over Creek in St. Tammany Parish, Louisiana. It was built in 1990, so it is 35 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 200 vehicles a day, projected to reach 220 by 2009. The structure is 85 ft (25.9 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesRoyal 18th DR
CrossesCreek
LocationRoyal 18 Estates Sub
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.33531, -89.83472
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating16.8 US tons
Inventory rating13.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span62 ft (18.9 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (1989)
Projected traffic220 by 2009
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$303,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Royal 18th DR over Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is Royal 18th DR over Creek 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 January 2025.

How much traffic does Royal 18th DR over Creek carry?

About 200 vehicles per day (1989 count).

How long is Royal 18th DR over Creek?

The structure is 85 ft (25.9 m) long with a longest span of 62 ft (18.9 m) and a deck 18 ft wide.

Who owns Royal 18th DR over Creek?

It is owned by the County Highway Agency.