US Bridges

I0020 over Cypress Bayou Bridge

Fair

Madison Parish, Louisiana · .7 MI East of East Int of · Structure no. 053304510828631

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
150 ft
6 main spans
Daily traffic
28,276
2021 count
Owner
State
State Highway Agency

About this bridge

I0020 over Cypress Bayou Bridge is a concrete slab carrying I0020 over Cypress Bayou Bridge in Madison Parish, Louisiana. It was built in 1975, so it is 50 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 28,276 vehicles a day, roughly 37% of them trucks, projected to reach 31,103 by 2041. The structure is 150 ft (45.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI0020
CrossesCypress Bayou Bridge
Location.7 MI East of East Int of
RouteInterstate 20
Coordinates32.32779, -91.0122
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJuly 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 rating85 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span25 ft (7.6 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,276 (2021)
Projected traffic31,103 by 2041
Trucks37%
Lanes on structure2
Traffic directionOne-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 Cypress Bayou Bridge built?

It was built in 1975, making it 50 years old in 2025.

What condition is I0020 over Cypress Bayou Bridge 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 2023.

How much traffic does I0020 over Cypress Bayou Bridge carry?

About 28,276 vehicles per day (2021 count), of which roughly 37% are trucks.

How long is I0020 over Cypress Bayou Bridge?

The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 43 ft wide.

Who owns I0020 over Cypress Bayou Bridge?

It is owned by the State Highway Agency.