US Bridges

Cazadero HWY over Hillside

Fair

Sonoma County, California · 3.6 MI N/O SR 116 · Structure no. 20C0554

Built
2011
14 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
3 main spans
Daily traffic
1,450
2015 count
Owner
County
County Highway Agency

About this bridge

Cazadero HWY over Hillside is a steel stringer/multi-beam or girder carrying Cazadero HWY over Hillside in Sonoma County, California. It was built in 2011, so it is 14 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 1,450 vehicles a day, roughly 4% of them trucks, projected to reach 1,769 by 2046. The structure is 59 ft (17.9 m) long and 10 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCazadero HWY
CrossesHillside
Location3.6 MI N/O SR 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.50961, -123.06915
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 inspectionJune 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadHS 20 + Mod
Structure length59 ft (17.9 m)
Longest span20 ft (6.1 m)
Deck width10 ft (3.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,450 (2015)
Projected traffic1,769 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed6.8 mi (11 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cazadero HWY over Hillside built?

It was built in 2011, making it 14 years old in 2025.

What condition is Cazadero HWY 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 June 2024.

How much traffic does Cazadero HWY over Hillside carry?

About 1,450 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Cazadero HWY over Hillside?

The structure is 59 ft (17.9 m) long with a longest span of 20 ft (6.1 m) and a deck 10 ft wide.

Who owns Cazadero HWY over Hillside?

It is owned by the County Highway Agency.