US Bridges

State Route 12 over Laguna De Santa Rosa

Fair

Sonoma County, California · 04-SON-012-9.63-SEB · Structure no. 20 0296

Built
2017
8 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
236 ft
3 main spans
Daily traffic
23,050
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 12 over Laguna De Santa Rosa is a prestressed concrete continuous stringer/multi-beam or girder carrying State Route 12 over Laguna De Santa Rosa in Sonoma County, California. It was built in 2017, so it is 8 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 23,050 vehicles a day, roughly 4% of them trucks, projected to reach 38,766 by 2044. The structure is 236 ft (71.9 m) long and 58 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesState Route 12
CrossesLaguna De Santa Rosa
Location04-SON-012-9.63-SEB
RouteState Highway 12
CountySonoma County
StateCalifornia
Coordinates38.40322, -122.81717
Functional classUrban Other Principal 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
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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length236 ft (71.9 m)
Longest span80 ft (24.5 m)
Deck width58 ft (17.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,050 (2016)
Projected traffic38,766 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 Laguna De Santa Rosa built?

It was built in 2017, making it 8 years old in 2025.

What condition is State Route 12 over Laguna De Santa Rosa 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 June 2024.

How much traffic does State Route 12 over Laguna De Santa Rosa carry?

About 23,050 vehicles per day (2016 count), of which roughly 4% are trucks.

How long is State Route 12 over Laguna De Santa Rosa?

The structure is 236 ft (71.9 m) long with a longest span of 80 ft (24.5 m) and a deck 58 ft wide.

Who owns State Route 12 over Laguna De Santa Rosa?

It is owned by the State Highway Agency.