US Bridges

Fitch Mountain RD over Hillside

Fair

Sonoma County, California · 1.3 MI E JCT Unv ST Heldg · Structure no. 20C0518

Built
1999
26 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
3 main spans
Daily traffic
400
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 1999, so it is 26 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 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 400 vehicles a day, roughly 1% of them trucks, projected to reach 918 by 2042. The structure is 76 ft (23.1 m) long and 16 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesFitch Mountain RD
CrossesHillside
Location1.3 MI E JCT Unv ST Heldg
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.61359, -122.83802
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length76 ft (23.1 m)
Longest span25 ft (7.7 m)
Deck width16 ft (4.9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2015)
Projected traffic918 by 2042
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 1999, making it 26 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 October 2024.

How much traffic does Fitch Mountain RD over Hillside carry?

About 400 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Fitch Mountain RD over Hillside?

The structure is 76 ft (23.1 m) long with a longest span of 25 ft (7.7 m) and a deck 16 ft wide.

Who owns Fitch Mountain RD over Hillside?

It is owned by the County Highway Agency.