US Bridges

Starrett Hill DR over Hillside

Fair

Sonoma County, California · 0.7 MI E Int Moscow RD · Structure no. 20C0394

Built
1988
37 years old
Condition
Fair
inspected March 2024
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 1988, so it is 37 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 218 by 2042. The structure is 52 ft (15.8 m) long and 21 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStarrett Hill DR
CrossesHillside
Location0.7 MI E Int Moscow RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.46639, -123.01425
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span19 ft (5.8 m)
Deck width21 ft (6.3 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2011)
Projected traffic218 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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 1988, making it 37 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 March 2024.

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 (15.8 m) long with a longest span of 19 ft (5.8 m) and a deck 21 ft wide.

Who owns Starrett Hill DR over Hillside?

It is owned by the County Highway Agency.