US Bridges

Grant Line RD over California Aqueduct

Poor

Alameda County, California · 0.1 MI NE of I-580 · Structure no. 33C0127

Built
1963
62 years old
Condition
Poor
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
2 main spans
Daily traffic
1,000
2010 count
Owner
Local
Other Local Agency

About this bridge

Grant Line RD over California Aqueduct is a prestressed concrete stringer/multi-beam or girder carrying Grant Line RD over California Aqueduct in Alameda County, California. It was built in 1963, so it is 62 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 1,000 vehicles a day, roughly 25% of them trucks, projected to reach 2,040 by 2041. The structure is 154 ft (46.9 m) long and 37 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesGrant Line RD
CrossesCalifornia Aqueduct
Location0.1 MI NE of I-580
RouteCounty Highway 0
CountyAlameda County
StateCalifornia
Coordinates37.75062, -121.57604
Functional classRural Major Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionNovember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span79 ft (24.1 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2010)
Projected traffic2,040 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$890,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grant Line RD over California Aqueduct built?

It was built in 1963, making it 62 years old in 2025.

What condition is Grant Line RD over California Aqueduct 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 November 2023.

How much traffic does Grant Line RD over California Aqueduct carry?

About 1,000 vehicles per day (2010 count), of which roughly 25% are trucks.

How long is Grant Line RD over California Aqueduct?

The structure is 154 ft (46.9 m) long with a longest span of 79 ft (24.1 m) and a deck 37 ft wide.

Who owns Grant Line RD over California Aqueduct?

It is owned by the Other Local Agency.