US Bridges

Greenwood Ave over Garnett Creek

PoorClosed to traffic

Napa County, California · .2 MI Ne/O Myrtledale RD · Structure no. 21C0042

Built
1904
121 years old
Condition
Poor
inspected August 2023
Type
Arch - Deck
Masonry
Length
50 ft
1 main span
Daily traffic
162
2014 count
Owner
County
County Highway Agency

About this bridge

Greenwood Ave over Garnett Creek is a masonry arch - deck carrying Greenwood Ave over Garnett Creek in Napa County, California. It was built in 1904, so it is 121 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 162 vehicles a day, roughly 10% of them trucks, projected to reach 546 by 2041. The structure is 50 ft (15.2 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGreenwood Ave
CrossesGarnett Creek
Location.2 MI Ne/O Myrtledale RD
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.59289, -122.59156
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span32 ft (9.8 m)
Deck width20 ft (6.2 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic162 (2014)
Projected traffic546 by 2041
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$370,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Greenwood Ave over Garnett Creek built?

It was built in 1904, making it 121 years old in 2025.

What condition is Greenwood Ave over Garnett Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does Greenwood Ave over Garnett Creek carry?

About 162 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Greenwood Ave over Garnett Creek?

The structure is 50 ft (15.2 m) long with a longest span of 32 ft (9.8 m) and a deck 20 ft wide.

Who owns Greenwood Ave over Garnett Creek?

It is owned by the County Highway Agency.