US Bridges

Fourth ST over Fife Creek

Fair

Sonoma County, California · Near Brookside LN · Structure no. 20C0318

Built
1926
99 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete
Length
35 ft
1 main span
Daily traffic
1,800
2015 count
Owner
County
County Highway Agency

About this bridge

Fourth ST over Fife Creek is a concrete tee beam carrying Fourth ST over Fife Creek in Sonoma County, California. It was built in 1926, so it is 99 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 1,800 vehicles a day, roughly 2% of them trucks, projected to reach 1,938 by 2046. The structure is 35 ft (10.7 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFourth ST
CrossesFife Creek
LocationNear Brookside LN
RouteCounty Highway 0
Coordinates38.50311, -123.00154
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating25.7 US tons
Inventory rating19.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,800 (2015)
Projected traffic1,938 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Fourth ST over Fife Creek built?

It was built in 1926, making it 99 years old in 2025.

What condition is Fourth ST over Fife Creek 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 Fourth ST over Fife Creek carry?

About 1,800 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Fourth ST over Fife Creek?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 30 ft wide.

Who owns Fourth ST over Fife Creek?

It is owned by the County Highway Agency.