US Bridges

Santa Rosa Ave over Hillside

Fair

Sonoma County, California · 1/4 MI E Old Monte Rio RD · Structure no. 20C0498

Built
1990
35 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
5 main spans
Daily traffic
100
2015 count
Owner
County
County Highway Agency

About this bridge

Santa Rosa Ave over Hillside is a steel stringer/multi-beam or girder carrying Santa Rosa Ave over Hillside in Sonoma County, California. It was built in 1990, so it is 35 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 6 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 100 vehicles a day, projected to reach 217 by 2042. The structure is 95 ft (29 m) long and 13 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSanta Rosa Ave
CrossesHillside
Location1/4 MI E Old Monte Rio RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.48821, -123.01796
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating48.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans5
Design loadHS 20
Structure length95 ft (29 m)
Longest span19 ft (5.8 m)
Deck width13 ft (4 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2015)
Projected traffic217 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Santa Rosa Ave over Hillside built?

It was built in 1990, making it 35 years old in 2025.

What condition is Santa Rosa Ave over Hillside 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 November 2024.

How much traffic does Santa Rosa Ave over Hillside carry?

About 100 vehicles per day (2015 count).

How long is Santa Rosa Ave over Hillside?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 13 ft wide.

Who owns Santa Rosa Ave over Hillside?

It is owned by the County Highway Agency.