US Bridges

State Route 13 SB over N13-W24 Connector Ramp

Good

Alameda County, California · 04-ALA-013-R9.69-OAK · Structure no. 33 0606L

Built
1996
29 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
319 ft
3 main spans
Daily traffic
49,000
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 13 SB over N13-W24 Connector Ramp is a prestressed concrete continuous box beam or girders - multiple carrying State Route 13 SB over N13-W24 Connector Ramp in Alameda 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 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 49,000 vehicles a day, roughly 10% of them trucks, projected to reach 73,078 by 2043. The structure is 319 ft (97.1 m) long and 43 ft wide.

CarriesState Route 13 SB
CrossesN13-W24 Connector Ramp
Location04-ALA-013-R9.69-OAK
RouteState Highway 13
Coordinates37.84933, -122.22954
Functional classUrban Other Principal 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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length319 ft (97.1 m)
Longest span155 ft (47.2 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,000 (2019)
Projected traffic73,078 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 State Route 13 SB over N13-W24 Connector Ramp built?

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

What condition is State Route 13 SB over N13-W24 Connector Ramp 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 March 2023.

How much traffic does State Route 13 SB over N13-W24 Connector Ramp carry?

About 49,000 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is State Route 13 SB over N13-W24 Connector Ramp?

The structure is 319 ft (97.1 m) long with a longest span of 155 ft (47.2 m) and a deck 43 ft wide.

Who owns State Route 13 SB over N13-W24 Connector Ramp?

It is owned by the State Highway Agency.