US Bridges

State Route 29 over Perfume Creek

Good

Napa County, California · 04-NAP-029-17.81-YNTV · Structure no. 21 0051

Built
1963
62 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
43,000
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 29 over Perfume Creek is a concrete continuous culvert carrying State Route 29 over Perfume Creek in Napa 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 43,000 vehicles a day, projected to reach 56,838 by 2045. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 8.7 mi (14 km).

CarriesState Route 29
CrossesPerfume Creek
Location04-NAP-029-17.81-YNTV
RouteState Highway 29
Coordinates38.38284, -122.34737
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,000 (2017)
Projected traffic56,838 by 2045
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 29 over Perfume Creek built?

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

What condition is State Route 29 over Perfume Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does State Route 29 over Perfume Creek carry?

About 43,000 vehicles per day (2017 count).

How long is State Route 29 over Perfume Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns State Route 29 over Perfume Creek?

It is owned by the State Highway Agency.