US Bridges

State Route 29 over California Drive

Fair

Napa County, California · 04-NAP-029-19.04-YNTV · Structure no. 21 0047

Built
1959
66 years old, rebuilt 1970
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
114 ft
3 main spans
Daily traffic
24,900
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 29 over California Drive is a concrete continuous tee beam carrying State Route 29 over California Drive in Napa County, California. It was built in 1959 and reconstructed in 1970, so it is 66 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 24,900 vehicles a day, projected to reach 42,894 by 2045. The structure is 114 ft (34.7 m) long and 91 ft wide.

Location

Open in Google Maps
CarriesState Route 29
CrossesCalifornia Drive
Location04-NAP-029-19.04-YNTV
RouteState Highway 29
CountyNapa County
StateCalifornia
Coordinates38.39759, -122.35888
Functional classRural Principal Arterial - Other

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length114 ft (34.7 m)
Longest span60 ft (18.3 m)
Deck width91 ft (27.7 m)
Roadway width87 ft (26.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,900 (2009)
Projected traffic42,894 by 2045
Trucks0%
Lanes on structure4
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 29 over California Drive built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1970.

What condition is State Route 29 over California Drive 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 April 2023.

How much traffic does State Route 29 over California Drive carry?

About 24,900 vehicles per day (2009 count).

How long is State Route 29 over California Drive?

The structure is 114 ft (34.7 m) long with a longest span of 60 ft (18.3 m) and a deck 91 ft wide.

Who owns State Route 29 over California Drive?

It is owned by the State Highway Agency.