US Bridges

I0020 over Cow Bayou

Fair

Richland Parish, Louisiana · .3 MI East of LA 583 · Structure no. 054204510714501

Built
1969
56 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
38,890
2021 count
Owner
State
State Highway Agency

About this bridge

I0020 over Cow Bayou is a concrete culvert carrying I0020 over Cow Bayou in Richland Parish, Louisiana. It was built in 1969, so it is 56 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 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 38,890 vehicles a day, roughly 37% of them trucks, projected to reach 42,779 by 2041. The structure is 26 ft (7.9 m) long and 192 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI0020
CrossesCow Bayou
Location.3 MI East of LA 583
RouteInterstate 20
Coordinates32.45617, -91.691
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width192 ft (58.5 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,890 (2021)
Projected traffic42,779 by 2041
Trucks37%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0020 over Cow Bayou built?

It was built in 1969, making it 56 years old in 2025.

What condition is I0020 over Cow Bayou 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 October 2023.

How much traffic does I0020 over Cow Bayou carry?

About 38,890 vehicles per day (2021 count), of which roughly 37% are trucks.

How long is I0020 over Cow Bayou?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m) and a deck 192 ft wide.

Who owns I0020 over Cow Bayou?

It is owned by the State Highway Agency.