US Bridges

State Route 128 over Blossom Creek

Fair

Napa County, California · 04-NAP-128-2.80 · Structure no. 21 0068

Built
1901
124 years old, rebuilt 1993
Condition
Fair
inspected April 2024
Type
Arch - Deck
Masonry
Length
22 ft
1 main span
Daily traffic
2,775
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Blossom Creek is a masonry arch - deck carrying State Route 128 over Blossom Creek in Napa County, California. It was built in 1901 and reconstructed in 1993, so it is 124 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 2,775 vehicles a day, roughly 7% of them trucks, projected to reach 3,673 by 2046. The structure is 22 ft (6.8 m) long and 44 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesState Route 128
CrossesBlossom Creek
Location04-NAP-128-2.80
RouteState Highway 128
CountyNapa County
StateCalifornia
Coordinates38.58714, -122.60571
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
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length22 ft (6.8 m)
Longest span20 ft (6.1 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,775 (2009)
Projected traffic3,673 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Blossom Creek built?

It was built in 1901, making it 124 years old in 2025. It was reconstructed in 1993.

What condition is State Route 128 over Blossom 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 April 2024.

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

About 2,775 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 128 over Blossom Creek?

The structure is 22 ft (6.8 m) long with a longest span of 20 ft (6.1 m) and a deck 44 ft wide.

Who owns State Route 128 over Blossom Creek?

It is owned by the State Highway Agency.