US Bridges

Mines RD over Arroyo Mocho

Fair

Alameda County, California · 12.6 MI S/E Tesla RD · Structure no. 33C0122

Built
1988
37 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete Continuous
Length
82 ft
2 main spans
Daily traffic
500
2014 count
Owner
County
County Highway Agency

About this bridge

Mines RD over Arroyo Mocho is a concrete continuous tee beam carrying Mines RD over Arroyo Mocho in Alameda County, California. It was built in 1988, so it is 37 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 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 500 vehicles a day, roughly 5% of them trucks, projected to reach 546 by 2041. The structure is 82 ft (25 m) long and 36 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMines RD
CrossesArroyo Mocho
Location12.6 MI S/E Tesla RD
RouteCounty Highway 0
CountyAlameda County
StateCalifornia
Coordinates37.55331, -121.57291
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span37 ft (11.3 m)
Deck width36 ft (11 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2014)
Projected traffic546 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 1988, making it 37 years old in 2025.

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

How long is Mines RD over Arroyo Mocho?

The structure is 82 ft (25 m) long with a longest span of 37 ft (11.3 m) and a deck 36 ft wide.

Who owns Mines RD over Arroyo Mocho?

It is owned by the County Highway Agency.