US Bridges

Riverside Ave over San Lorenzo River

Fair

Santa Cruz County, California · 50 S San Lorenzo Blvd · Structure no. 36C0099

Built
1990
35 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
284 ft
3 main spans
Daily traffic
22,577
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Riverside Ave over San Lorenzo River is a prestressed concrete continuous box beam or girders - multiple carrying Riverside Ave over San Lorenzo River in Santa Cruz County, California. It was built in 1990, so it is 35 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 22,577 vehicles a day, roughly 10% of them trucks, projected to reach 30,912 by 2040. The structure is 284 ft (86.6 m) long and 73 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesRiverside Ave
CrossesSan Lorenzo River
Location50 S San Lorenzo Blvd
RouteCity Street 0
Coordinates36.96861, -122.01921
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable 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 length284 ft (86.6 m)
Longest span107 ft (32.6 m)
Deck width73 ft (22.3 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,577 (2015)
Projected traffic30,912 by 2040
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed0.6 mi (1 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 Riverside Ave over San Lorenzo River built?

It was built in 1990, making it 35 years old in 2025.

What condition is Riverside Ave over San Lorenzo River 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 September 2023.

How much traffic does Riverside Ave over San Lorenzo River carry?

About 22,577 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is Riverside Ave over San Lorenzo River?

The structure is 284 ft (86.6 m) long with a longest span of 107 ft (32.6 m) and a deck 73 ft wide.

Who owns Riverside Ave over San Lorenzo River?

It is owned by the City or Municipal Highway Agency.