US Bridges

State Route 61 over San Leandro Bay

Fair

Alameda County, California · 04-ALA-061-18.55-ALA · Structure no. 33 0086

Built
1953
72 years old
Condition
Fair
inspected March 2023
Type
Movable - Bascule
Steel
Length
963 ft
1 main span
Daily traffic
43,600
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 61 over San Leandro Bay is a steel movable - bascule carrying State Route 61 over San Leandro Bay in Alameda County, California. It was built in 1953, so it is 72 years old, older 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 43,600 vehicles a day, roughly 5% of them trucks, projected to reach 89,255 by 2045. The structure is 963 ft (293.5 m) long and 65 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesState Route 61
CrossesSan Leandro Bay
Location04-ALA-061-18.55-ALA
RouteState Highway 61
CountyAlameda County
StateCalifornia
Coordinates37.74745, -122.23601
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating51.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+21 approach)
Design loadHS 20
Structure length963 ft (293.5 m)
Longest span105 ft (31.9 m)
Deck width65 ft (19.9 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,600 (2019)
Projected traffic89,255 by 2045
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was State Route 61 over San Leandro Bay built?

It was built in 1953, making it 72 years old in 2025.

What condition is State Route 61 over San Leandro Bay 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 March 2023.

How much traffic does State Route 61 over San Leandro Bay carry?

About 43,600 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is State Route 61 over San Leandro Bay?

The structure is 963 ft (293.5 m) long with a longest span of 105 ft (31.9 m) and a deck 65 ft wide.

Who owns State Route 61 over San Leandro Bay?

It is owned by the State Highway Agency.