US Bridges

Zinfandel Lane over Napa River

Fair

Napa County, California · 1 MI E Rt 29 Wheeler Sta · Structure no. 21C0002

Built
1913
112 years old
Condition
Fair
inspected May 2023
Type
Arch - Deck
Masonry
Length
95 ft
2 main spans
Daily traffic
2,600
2005 count
Owner
County
County Highway Agency

About this bridge

Zinfandel Lane over Napa River is a masonry arch - deck carrying Zinfandel Lane over Napa River in Napa County, California. It was built in 1913, so it is 112 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 2,600 vehicles a day, roughly 10% of them trucks, projected to reach 3,979 by 2040. The structure is 95 ft (29 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesZinfandel Lane
CrossesNapa River
Location1 MI E Rt 29 Wheeler Sta
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.49518, -122.42572
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans2
Design loadUnknown
Structure length95 ft (29 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2005)
Projected traffic3,979 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

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

Frequently asked questions

When was Zinfandel Lane over Napa River built?

It was built in 1913, making it 112 years old in 2025.

What condition is Zinfandel Lane over Napa River 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 2023.

How much traffic does Zinfandel Lane over Napa River carry?

About 2,600 vehicles per day (2005 count), of which roughly 10% are trucks.

How long is Zinfandel Lane over Napa River?

The structure is 95 ft (29 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns Zinfandel Lane over Napa River?

It is owned by the County Highway Agency.