US Bridges

Oakville Cross RD over Conn Creek

Fair

Napa County, California · 0.9 MI W Silverado Trail · Structure no. 21C0083

Built
1967
58 years old
Condition
Fair
inspected May 2022
Type
Slab
Concrete Continuous
Length
114 ft
4 main spans
Daily traffic
483
2012 count
Owner
County
County Highway Agency

About this bridge

Oakville Cross RD over Conn Creek is a concrete continuous slab carrying Oakville Cross RD over Conn Creek in Napa County, California. It was built in 1967, so it is 58 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 6 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 483 vehicles a day, roughly 10% of them trucks, projected to reach 806 by 2042. The structure is 114 ft (34.7 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesOakville Cross RD
CrossesConn Creek
Location0.9 MI W Silverado Trail
RouteCounty Highway 0
Coordinates38.44728, -122.38069
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length114 ft (34.7 m)
Longest span28 ft (8.5 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic483 (2012)
Projected traffic806 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Oakville Cross RD over Conn Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Oakville Cross RD over Conn Creek 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 May 2022.

How much traffic does Oakville Cross RD over Conn Creek carry?

About 483 vehicles per day (2012 count), of which roughly 10% are trucks.

How long is Oakville Cross RD over Conn Creek?

The structure is 114 ft (34.7 m) long with a longest span of 28 ft (8.5 m) and a deck 32 ft wide.

Who owns Oakville Cross RD over Conn Creek?

It is owned by the County Highway Agency.