US Bridges

W Third ST over Santa Rosa Creek

Fair

Sonoma County, California · Btwn Rbts & Wlsn · Structure no. 20C0169

Built
1935
90 years old, rebuilt 1968
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
126 ft
2 main spans
Daily traffic
14,600
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

W Third ST over Santa Rosa Creek is a concrete continuous tee beam carrying W Third ST over Santa Rosa Creek in Sonoma County, California. It was built in 1935 and reconstructed in 1968, so it is 90 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 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 14,600 vehicles a day, roughly 4% of them trucks, projected to reach 20,130 by 2044. The structure is 126 ft (38.4 m) long and 79 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesW Third ST
CrossesSanta Rosa Creek
LocationBtwn Rbts & Wlsn
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.43524, -122.72259
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating20.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadH 20
Structure length126 ft (38.4 m)
Longest span51 ft (15.5 m)
Deck width79 ft (24.2 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,600 (2019)
Projected traffic20,130 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 W Third ST over Santa Rosa Creek built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1968.

What condition is W Third ST over Santa Rosa 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 W Third ST over Santa Rosa Creek carry?

About 14,600 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is W Third ST over Santa Rosa Creek?

The structure is 126 ft (38.4 m) long with a longest span of 51 ft (15.5 m) and a deck 79 ft wide.

Who owns W Third ST over Santa Rosa Creek?

It is owned by the City or Municipal Highway Agency.