US Bridges

Starrett Hill DR over Hillside

Fair

Sonoma County, California · 0.4 MI E Intx Moscow RD · Structure no. 20C0395

Built
1986
39 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
52 ft
3 main spans
Daily traffic
200
2011 count
Owner
County
County Highway Agency

About this bridge

Starrett Hill DR over Hillside is a steel stringer/multi-beam or girder carrying Starrett Hill DR over Hillside in Sonoma County, California. It was built in 1986, so it is 39 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 200 vehicles a day, roughly 1% of them trucks, projected to reach 229 by 2043. The structure is 52 ft (15.7 m) long and 9 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStarrett Hill DR
CrossesHillside
Location0.4 MI E Intx Moscow RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.46905, -123.01752
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating83.2 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length52 ft (15.7 m)
Longest span18 ft (5.4 m)
Deck width9 ft (2.8 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2011)
Projected traffic229 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 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 Starrett Hill DR over Hillside built?

It was built in 1986, making it 39 years old in 2025.

What condition is Starrett Hill DR 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 July 2023.

How much traffic does Starrett Hill DR over Hillside carry?

About 200 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Starrett Hill DR over Hillside?

The structure is 52 ft (15.7 m) long with a longest span of 18 ft (5.4 m) and a deck 9 ft wide.

Who owns Starrett Hill DR over Hillside?

It is owned by the County Highway Agency.