US Bridges

Camino Alto over Ayo Corte Madera Del Pre

Good

Marin County, California · 0.15 MI N Miller Ave · Structure no. 27C0030

Built
1970
55 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
54 ft
2 main spans
Daily traffic
4,000
2004 count
Owner
City
City or Municipal Highway Agency

About this bridge

Camino Alto over Ayo Corte Madera Del Pre is a concrete continuous slab carrying Camino Alto over Ayo Corte Madera Del Pre in Marin County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,000 vehicles a day, roughly 10% of them trucks, projected to reach 7,206 by 2041. The structure is 54 ft (16.5 m) long and 94 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCamino Alto
CrossesAyo Corte Madera Del Pre
Location0.15 MI N Miller Ave
RouteCity Street 0
Coordinates37.89521, -122.5299
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length54 ft (16.5 m)
Longest span27 ft (8.1 m)
Deck width94 ft (28.6 m)
Roadway width56 ft (17 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2004)
Projected traffic7,206 by 2041
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Camino Alto over Ayo Corte Madera Del Pre built?

It was built in 1970, making it 55 years old in 2025.

What condition is Camino Alto over Ayo Corte Madera Del Pre in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Camino Alto over Ayo Corte Madera Del Pre carry?

About 4,000 vehicles per day (2004 count), of which roughly 10% are trucks.

How long is Camino Alto over Ayo Corte Madera Del Pre?

The structure is 54 ft (16.5 m) long with a longest span of 27 ft (8.1 m) and a deck 94 ft wide.

Who owns Camino Alto over Ayo Corte Madera Del Pre?

It is owned by the City or Municipal Highway Agency.