US Bridges

Santa Rosa AV-S101 over U.S. Highway 101

Fair

Sonoma County, California · 04-SON-101-15.53 · Structure no. 20 0171K

Built
1957
68 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
159 ft
2 main spans
Daily traffic
3,000
2016 count
Owner
State
State Highway Agency

About this bridge

Santa Rosa AV-S101 over U.S. Highway 101 is a concrete continuous box beam or girders - multiple carrying Santa Rosa AV-S101 over U.S. Highway 101 in Sonoma County, California. It was built in 1957, so it is 68 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 8,735 by 2046. The structure is 159 ft (48.5 m) long and 27 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSanta Rosa AV-S101
CrossesU.S. Highway 101
Location04-SON-101-15.53
RouteU.S. Route 101
CountySonoma County
StateCalifornia
Coordinates38.37176, -122.71444
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.3 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span77 ft (23.5 m)
Deck width27 ft (8.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2016)
Projected traffic8,735 by 2046
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 Santa Rosa AV-S101 over U.S. Highway 101 built?

It was built in 1957, making it 68 years old in 2025.

What condition is Santa Rosa AV-S101 over U.S. Highway 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 April 2024.

How much traffic does Santa Rosa AV-S101 over U.S. Highway 101 carry?

About 3,000 vehicles per day (2016 count), of which roughly 2% are trucks.

How long is Santa Rosa AV-S101 over U.S. Highway 101?

The structure is 159 ft (48.5 m) long with a longest span of 77 ft (23.5 m) and a deck 27 ft wide.

Who owns Santa Rosa AV-S101 over U.S. Highway 101?

It is owned by the State Highway Agency.