US Bridges

Arnold Drive over BNSF RY

Fair

Contra Costa County, California · At Muir Tunnel · Structure no. 28C0084

Built
1975
50 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
105 ft
1 main span
Daily traffic
3,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Arnold Drive over BNSF RY is a prestressed concrete box beam or girders - multiple carrying Arnold Drive over BNSF RY in Contra Costa County, California. It was built in 1975, so it is 50 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 4,718 by 2047. The structure is 105 ft (32 m) long and 47 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesArnold Drive
CrossesBNSF RY
LocationAt Muir Tunnel
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.99671, -122.11961
Functional classUrban 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.
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.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating36.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length105 ft (32 m)
Longest span104 ft (31.7 m)
Deck width47 ft (14.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2020)
Projected traffic4,718 by 2047
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Arnold Drive over BNSF RY built?

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

What condition is Arnold Drive over BNSF RY 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 February 2025.

How much traffic does Arnold Drive over BNSF RY carry?

About 3,000 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Arnold Drive over BNSF RY?

The structure is 105 ft (32 m) long with a longest span of 104 ft (31.7 m) and a deck 47 ft wide.

Who owns Arnold Drive over BNSF RY?

It is owned by the City or Municipal Highway Agency.