US Bridges

Summerhome Park RD over Hillside

Fair

Sonoma County, California · 0.1 MI NW Laurel RD · Structure no. 20C0379

Built
1930
95 years old, rebuilt 2022
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
4 main spans
Daily traffic
50
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 1930 and reconstructed in 2022, so it is 95 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 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 50 vehicles a day, projected to reach 112 by 2041. The structure is 74 ft (22.6 m) long and 9 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSummerhome Park RD
CrossesHillside
Location0.1 MI NW Laurel RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.4985, -122.94121
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans4
Design loadUnknown
Structure length74 ft (22.6 m)
Longest span18 ft (5.5 m)
Deck width9 ft (2.8 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2011)
Projected traffic112 by 2041
Trucks—
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 1930, making it 95 years old in 2025. It was reconstructed in 2022.

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 July 2023.

How much traffic does Summerhome Park RD over Hillside carry?

About 50 vehicles per day (2011 count).

How long is Summerhome Park RD over Hillside?

The structure is 74 ft (22.6 m) long with a longest span of 18 ft (5.5 m) and a deck 9 ft wide.

Who owns Summerhome Park RD over Hillside?

It is owned by the County Highway Agency.