US Bridges

Summerhome Park RD over Hillside

Fair

Sonoma County, California · 0.4 MI SW River Road · Structure no. 20C0505

Built
1992
33 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
4 main spans
Daily traffic
150
2011 count
Owner
County
County Highway Agency

About this bridge

Summerhome Park RD over Hillside is a steel stringer/multi-beam or girder carrying Summerhome Park RD over Hillside in Sonoma County, California. It was built in 1992, so it is 33 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 150 vehicles a day, roughly 1% of them trucks, projected to reach 121 by 2042. The structure is 74 ft (22.7 m) long and 8 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSummerhome Park RD
CrossesHillside
Location0.4 MI SW River Road
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.50245, -122.93082
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 inspectionMarch 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans4
Design loadUnknown
Structure length74 ft (22.7 m)
Longest span19 ft (5.9 m)
Deck width8 ft (2.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2011)
Projected traffic121 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed123.7 mi (199 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 Summerhome Park RD over Hillside built?

It was built in 1992, making it 33 years old in 2025.

What condition is Summerhome Park RD 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 Summerhome Park RD over Hillside carry?

About 150 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Summerhome Park RD over Hillside?

The structure is 74 ft (22.7 m) long with a longest span of 19 ft (5.9 m) and a deck 8 ft wide.

Who owns Summerhome Park RD over Hillside?

It is owned by the County Highway Agency.