US Bridges

Fitch Mountain RD over Hillside

Fair

Sonoma County, California · 1.6 MI E JCT Healdsbg Ave · Structure no. 20C0417

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
5 main spans
Daily traffic
525
2015 count
Owner
County
County Highway Agency

About this bridge

Fitch Mountain RD over Hillside is a steel stringer/multi-beam or girder carrying Fitch Mountain RD over Hillside in Sonoma County, California. It was built in 1970, 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 525 vehicles a day, roughly 1% of them trucks, projected to reach 650 by 2040. The structure is 100 ft (30.5 m) long and 9 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesFitch Mountain RD
CrossesHillside
Location1.6 MI E JCT Healdsbg Ave
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.6241, -122.84792
Functional classUrban 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 inspectionMay 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.2 m)
Deck width9 ft (2.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic525 (2015)
Projected traffic650 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed9.9 mi (16 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 Fitch Mountain RD over Hillside built?

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

What condition is Fitch Mountain 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 May 2023.

How much traffic does Fitch Mountain RD over Hillside carry?

About 525 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Fitch Mountain RD over Hillside?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.2 m) and a deck 9 ft wide.

Who owns Fitch Mountain RD over Hillside?

It is owned by the County Highway Agency.