US Bridges

US Highway 101 over West Railroad Avenue

Fair

Sonoma County, California · 04-SON-101-10.67 · Structure no. 20 0289

Built
2011
14 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
173 ft
1 main span
Daily traffic
90,000
2016 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 over West Railroad Avenue is a prestressed concrete box beam or girders - multiple carrying US Highway 101 over West Railroad Avenue in Sonoma County, California. It was built in 2011, so it is 14 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 90,000 vehicles a day, projected to reach 148,929 by 2046. The structure is 173 ft (52.8 m) long and 115 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesUS Highway 101
CrossesWest Railroad Avenue
Location04-SON-101-10.67
RouteU.S. Route 101
CountySonoma County
StateCalifornia
Coordinates38.30363, -122.70794
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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
Structure length173 ft (52.8 m)
Longest span173 ft (52.8 m)
Deck width115 ft (35.1 m)
Roadway width110 ft (33.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90,000 (2016)
Projected traffic148,929 by 2046
Trucks0%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 US Highway 101 over West Railroad Avenue built?

It was built in 2011, making it 14 years old in 2025.

What condition is US Highway 101 over West Railroad Avenue 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 US Highway 101 over West Railroad Avenue carry?

About 90,000 vehicles per day (2016 count).

How long is US Highway 101 over West Railroad Avenue?

The structure is 173 ft (52.8 m) long with a longest span of 173 ft (52.8 m) and a deck 115 ft wide.

Who owns US Highway 101 over West Railroad Avenue?

It is owned by the State Highway Agency.