US Bridges

Avenue 18 over Berenda Slough

Fair

Madera County, California · At Int RD 12 · Structure no. 41C0096

Built
1973
52 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
108 ft
4 main spans
Daily traffic
300
2020 count
Owner
County
County Highway Agency

About this bridge

Avenue 18 over Berenda Slough is a concrete continuous slab carrying Avenue 18 over Berenda Slough in Madera County, California. It was built in 1973, so it is 52 years old, younger than the California average of 54.8 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 300 vehicles a day, roughly 10% of them trucks, projected to reach 411 by 2042. The structure is 108 ft (32.9 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesAvenue 18
CrossesBerenda Slough
LocationAt Int RD 12
RouteCounty Highway 0
CountyMadera County
StateCalifornia
Coordinates37.01088, -120.32842
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
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 inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.8 US tons
Inventory rating46.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2020)
Projected traffic411 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Avenue 18 over Berenda Slough built?

It was built in 1973, making it 52 years old in 2025.

What condition is Avenue 18 over Berenda Slough 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 2024.

How much traffic does Avenue 18 over Berenda Slough carry?

About 300 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Avenue 18 over Berenda Slough?

The structure is 108 ft (32.9 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Avenue 18 over Berenda Slough?

It is owned by the County Highway Agency.