US Bridges

Stwrt Pt-Skgg Sprg over Hillside

Fair

Sonoma County, California · 9.7 MI E/O SR 1 · Structure no. 20C0143

Built
1970
55 years old, rebuilt 2010
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
5 main spans
Daily traffic
300
2015 count
Owner
County
County Highway Agency

About this bridge

Stwrt Pt-Skgg Sprg over Hillside is a steel stringer/multi-beam or girder carrying Stwrt Pt-Skgg Sprg over Hillside in Sonoma County, California. It was built in 1970 and reconstructed in 2010, so it is 55 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 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 300 vehicles a day, roughly 4% of them trucks, projected to reach 209 by 2040. The structure is 95 ft (29 m) long and 14 ft wide. If it were closed, the detour would be 78.9 mi (127 km).

Location

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CarriesStwrt Pt-Skgg Sprg
CrossesHillside
Location9.7 MI E/O SR 1
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.67814, -123.26957
Functional classRural Major Collector

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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans5
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span19 ft (5.9 m)
Deck width14 ft (4.3 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2015)
Projected traffic209 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed78.9 mi (127 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 Stwrt Pt-Skgg Sprg over Hillside built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2010.

What condition is Stwrt Pt-Skgg Sprg 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 Stwrt Pt-Skgg Sprg over Hillside carry?

About 300 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Stwrt Pt-Skgg Sprg over Hillside?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.9 m) and a deck 14 ft wide.

Who owns Stwrt Pt-Skgg Sprg over Hillside?

It is owned by the County Highway Agency.