US Bridges

Denham RD over New River Canal

Fair

Ascension Parish, Louisiana · 1.4 Mi. N-LA30 US61 Jct. · Structure no. 610330139905321

Built
2000
25 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
76 ft
4 main spans
Daily traffic
100
2019 count
Owner
County
County Highway Agency

About this bridge

Denham RD over New River Canal is a concrete slab carrying Denham RD over New River Canal in Ascension Parish, Louisiana. It was built in 2000, so it is 25 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.

It carries about 100 vehicles a day, projected to reach 110 by 2039. The structure is 76 ft (23.2 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesDenham RD
CrossesNew River Canal
Location1.4 Mi. N-LA30 US61 Jct.
RouteCounty Highway 0
CountyAscension Parish
StateLouisiana
Coordinates30.23191, -90.88684
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating60 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span19 ft (5.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2019)
Projected traffic110 by 2039
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Denham RD over New River Canal built?

It was built in 2000, making it 25 years old in 2025.

What condition is Denham RD over New River Canal 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 March 2023.

How much traffic does Denham RD over New River Canal carry?

About 100 vehicles per day (2019 count).

How long is Denham RD over New River Canal?

The structure is 76 ft (23.2 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns Denham RD over New River Canal?

It is owned by the County Highway Agency.