US Bridges

Warm Springs RD over Sonoma Creek

Fair

Sonoma County, California · 9.85 MI N of SR 116 · Structure no. 20C0216

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
101 ft
3 main spans
Daily traffic
3,000
2015 count
Owner
County
County Highway Agency

About this bridge

Warm Springs RD over Sonoma Creek is a prestressed concrete tee beam carrying Warm Springs RD over Sonoma Creek in Sonoma County, California. It was built in 1960, so it is 65 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 3,000 vehicles a day, roughly 5% of them trucks, projected to reach 1,918 by 2040. The structure is 101 ft (30.8 m) long and 37 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesWarm Springs RD
CrossesSonoma Creek
Location9.85 MI N of SR 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.36982, -122.53812
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span50 ft (15.2 m)
Deck width37 ft (11.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2015)
Projected traffic1,918 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 Warm Springs RD over Sonoma Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Warm Springs RD over Sonoma 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 May 2023.

How much traffic does Warm Springs RD over Sonoma Creek carry?

About 3,000 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Warm Springs RD over Sonoma Creek?

The structure is 101 ft (30.8 m) long with a longest span of 50 ft (15.2 m) and a deck 37 ft wide.

Who owns Warm Springs RD over Sonoma Creek?

It is owned by the County Highway Agency.