US Bridges

Pearl ST over Napa Creek

Fair

Napa County, California · Btwn Main and Coombs Sts · Structure no. 21C0097

Built
1920
105 years old
Condition
Fair
inspected August 2023
Type
Arch - Deck
Masonry
Length
50 ft
1 main span
Daily traffic
3,400
1979 count
Owner
City
City or Municipal Highway Agency

About this bridge

Pearl ST over Napa Creek is a masonry arch - deck carrying Pearl ST over Napa Creek in Napa County, California. It was built in 1920, so it is 105 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 3,400 vehicles a day, roughly 10% of them trucks, projected to reach 5,561 by 2041. The structure is 50 ft (15.2 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPearl ST
CrossesNapa Creek
LocationBtwn Main and Coombs Sts
RouteCity Street 0
CountyNapa County
StateCalifornia
Coordinates38.30021, -122.28723
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating27.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span43 ft (13.1 m)
Deck width60 ft (18.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (1979)
Projected traffic5,561 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Pearl ST over Napa Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is Pearl ST over Napa 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 August 2023.

How much traffic does Pearl ST over Napa Creek carry?

About 3,400 vehicles per day (1979 count), of which roughly 10% are trucks.

How long is Pearl ST over Napa Creek?

The structure is 50 ft (15.2 m) long with a longest span of 43 ft (13.1 m) and a deck 60 ft wide.

Who owns Pearl ST over Napa Creek?

It is owned by the City or Municipal Highway Agency.