US Bridges

Mines RD over Arroyo Mocho

Fair

Alameda County, California · 3.2 MI SW Tesla RD · Structure no. 33C0124

Built
1925
100 years old, rebuilt 1987
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
122 ft
5 main spans
Daily traffic
1,930
2014 count
Owner
County
County Highway Agency

About this bridge

Mines RD over Arroyo Mocho is a concrete continuous slab carrying Mines RD over Arroyo Mocho in Alameda County, California. It was built in 1925 and reconstructed in 1987, so it is 100 years old, older 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 5 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 1,930 vehicles a day, roughly 5% of them trucks, projected to reach 2,180 by 2041. The structure is 122 ft (37.2 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMines RD
CrossesArroyo Mocho
Location3.2 MI SW Tesla RD
RouteCounty Highway 0
CountyAlameda County
StateCalifornia
Coordinates37.62631, -121.7042
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span24 ft (7.3 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,930 (2014)
Projected traffic2,180 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Mines RD over Arroyo Mocho built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1987.

What condition is Mines RD over Arroyo Mocho 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 November 2023.

How much traffic does Mines RD over Arroyo Mocho carry?

About 1,930 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is Mines RD over Arroyo Mocho?

The structure is 122 ft (37.2 m) long with a longest span of 24 ft (7.3 m) and a deck 44 ft wide.

Who owns Mines RD over Arroyo Mocho?

It is owned by the County Highway Agency.