US Bridges

France ST over Nathanson Creek

FairPosted for load

Sonoma County, California · 0.1 MI E SR 12 Sonoma · Structure no. 20C0496

Built
1918
107 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
750
2013 count
Owner
City
City or Municipal Highway Agency

About this bridge

France ST over Nathanson Creek is a concrete tee beam carrying France ST over Nathanson Creek in Sonoma County, California. It was built in 1918, so it is 107 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. Its operating status is: posted for load restriction.

It carries about 750 vehicles a day, roughly 1% of them trucks, projected to reach 1,924 by 2045. The structure is 32 ft (9.8 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFrance ST
CrossesNathanson Creek
Location0.1 MI E SR 12 Sonoma
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.2882, -122.45755
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span27 ft (8.2 m)
Deck width35 ft (10.7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2013)
Projected traffic1,924 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 France ST over Nathanson Creek built?

It was built in 1918, making it 107 years old in 2025.

What condition is France ST over Nathanson 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 2023.

How much traffic does France ST over Nathanson Creek carry?

About 750 vehicles per day (2013 count), of which roughly 1% are trucks.

How long is France ST over Nathanson Creek?

The structure is 32 ft (9.8 m) long with a longest span of 27 ft (8.2 m) and a deck 35 ft wide.

Who owns France ST over Nathanson Creek?

It is owned by the City or Municipal Highway Agency.