US Bridges

E12-N101 Connector over SR 12 & US 101

Fair

Sonoma County, California · 04-SON-012-R15.99-SRO · Structure no. 20 0207G

Built
1964
61 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
825 ft
8 main spans
Daily traffic
7,800
2016 count
Owner
State
State Highway Agency

About this bridge

E12-N101 Connector over SR 12 & US 101 is a concrete continuous box beam or girders - multiple carrying E12-N101 Connector over SR 12 & US 101 in Sonoma County, California. It was built in 1964, so it is 61 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 7,800 vehicles a day, roughly 3% of them trucks, projected to reach 10,688 by 2046. The structure is 825 ft (251.5 m) long and 26 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesE12-N101 Connector
CrossesSR 12 & US 101
Location04-SON-012-R15.99-SRO
RouteState Highway 12
CountySonoma County
StateCalifornia
Coordinates38.43169, -122.71773
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length825 ft (251.5 m)
Longest span127 ft (38.7 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,800 (2016)
Projected traffic10,688 by 2046
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 E12-N101 Connector over SR 12 & US 101 built?

It was built in 1964, making it 61 years old in 2025.

What condition is E12-N101 Connector over SR 12 & US 101 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 September 2024.

How much traffic does E12-N101 Connector over SR 12 & US 101 carry?

About 7,800 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is E12-N101 Connector over SR 12 & US 101?

The structure is 825 ft (251.5 m) long with a longest span of 127 ft (38.7 m) and a deck 26 ft wide.

Who owns E12-N101 Connector over SR 12 & US 101?

It is owned by the State Highway Agency.