US Bridges

State Route 128 over Wragg Creek

Good

Napa County, California · 04-NAP-128-27.90 · Structure no. 21 0081

Built
1955
70 years old
Condition
Good
inspected April 2024
Type
Culvert
Steel
Length
26 ft
2 main spans
Daily traffic
1,675
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Wragg Creek is a steel culvert carrying State Route 128 over Wragg Creek in Napa County, California. It was built in 1955, so it is 70 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 1,675 vehicles a day, roughly 9% of them trucks, projected to reach 1,734 by 2046. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 49.7 mi (80 km).

CarriesState Route 128
CrossesWragg Creek
Location04-NAP-128-27.90
RouteState Highway 128
Coordinates38.44927, -122.15188
Functional classRural Minor Arterial

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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,675 (2009)
Projected traffic1,734 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

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 128 over Wragg Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is State Route 128 over Wragg 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 2024.

How much traffic does State Route 128 over Wragg Creek carry?

About 1,675 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is State Route 128 over Wragg Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns State Route 128 over Wragg Creek?

It is owned by the State Highway Agency.