US Bridges

State Route 12 over Chadbourne Road

Fair

Solano County, California · 04-SOL-012-L2.22 · Structure no. 23 0200

Built
1987
38 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
139 ft
1 main span
Daily traffic
40,500
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 12 over Chadbourne Road is a prestressed concrete box beam or girders - multiple carrying State Route 12 over Chadbourne Road in Solano County, California. It was built in 1987, so it is 38 years old, younger 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 40,500 vehicles a day, roughly 7% of them trucks, projected to reach 45,528 by 2044. The structure is 139 ft (42.4 m) long and 100 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesState Route 12
CrossesChadbourne Road
Location04-SOL-012-L2.22
RouteState Highway 12
CountySolano County
StateCalifornia
Coordinates38.23963, -122.08437
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length139 ft (42.4 m)
Longest span136 ft (41.5 m)
Deck width100 ft (30.5 m)
Roadway width94 ft (28.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,500 (2019)
Projected traffic45,528 by 2044
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 12 over Chadbourne Road built?

It was built in 1987, making it 38 years old in 2025.

What condition is State Route 12 over Chadbourne Road 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 March 2024.

How much traffic does State Route 12 over Chadbourne Road carry?

About 40,500 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is State Route 12 over Chadbourne Road?

The structure is 139 ft (42.4 m) long with a longest span of 136 ft (41.5 m) and a deck 100 ft wide.

Who owns State Route 12 over Chadbourne Road?

It is owned by the State Highway Agency.