US Bridges

High ST over Oakland Estuary

Poor

Alameda County, California · 0.4 MI S/W of I-880 · Structure no. 33C0026

Built
1939
86 years old
Condition
Poor
inspected April 2023
Type
Movable - Bascule
Steel
Length
505 ft
3 main spans
Daily traffic
19,900
2014 count
Owner
County
County Highway Agency

About this bridge

High ST over Oakland Estuary is a steel movable - bascule carrying High ST over Oakland Estuary in Alameda County, California. It was built in 1939, so it is 86 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 19,900 vehicles a day, roughly 10% of them trucks, projected to reach 23,282 by 2041. The structure is 505 ft (154 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHigh ST
CrossesOakland Estuary
Location0.4 MI S/W of I-880
RouteCounty Highway 0
CountyAlameda County
StateCalifornia
Coordinates37.76401, -122.22547
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans3 (+6 approach)
Design loadUnknown
Structure length505 ft (154 m)
Longest span296 ft (90.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck14 ft (4.4 m)

Traffic and service

Average daily traffic19,900 (2014)
Projected traffic23,282 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2017 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was High ST over Oakland Estuary built?

It was built in 1939, making it 86 years old in 2025.

What condition is High ST over Oakland Estuary in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does High ST over Oakland Estuary carry?

About 19,900 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is High ST over Oakland Estuary?

The structure is 505 ft (154 m) long with a longest span of 296 ft (90.2 m) and a deck 26 ft wide.

Who owns High ST over Oakland Estuary?

It is owned by the County Highway Agency.