US Bridges

NB SR 242 On-Ramp over Concord Avenue

Fair

Contra Costa County, California · 04-CC-242-R1.40-CND · Structure no. 28 0185S

Built
1996
29 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
148 ft
3 main spans
Daily traffic
5,200
2012 count
Owner
State
State Highway Agency

About this bridge

NB SR 242 On-Ramp over Concord Avenue is a prestressed concrete continuous stringer/multi-beam or girder carrying NB SR 242 On-Ramp over Concord Avenue in Contra Costa County, California. It was built in 1996, so it is 29 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 5,200 vehicles a day, roughly 5% of them trucks, projected to reach 6,244 by 2044. The structure is 148 ft (45 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNB SR 242 On-Ramp
CrossesConcord Avenue
Location04-CC-242-R1.40-CND
RouteState Highway 242
CountyContra Costa County
StateCalifornia
Coordinates37.9787, -122.04308
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length148 ft (45 m)
Longest span84 ft (25.5 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2012)
Projected traffic6,244 by 2044
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NB SR 242 On-Ramp over Concord Avenue built?

It was built in 1996, making it 29 years old in 2025.

What condition is NB SR 242 On-Ramp over Concord Avenue 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 NB SR 242 On-Ramp over Concord Avenue carry?

About 5,200 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is NB SR 242 On-Ramp over Concord Avenue?

The structure is 148 ft (45 m) long with a longest span of 84 ft (25.5 m) and a deck 39 ft wide.

Who owns NB SR 242 On-Ramp over Concord Avenue?

It is owned by the State Highway Agency.