US Bridges

Petaluma Blvd N over Petaluma River

Fair

Sonoma County, California · 0.2 MI S JCT US 101 · Structure no. 20C0056R

Built
1940
85 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
126 ft
6 main spans
Daily traffic
4,200
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Petaluma Blvd N over Petaluma River is a concrete continuous slab carrying Petaluma Blvd N over Petaluma River in Sonoma County, California. It was built in 1940, so it is 85 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 4,200 vehicles a day, roughly 2% of them trucks, projected to reach 10,903 by 2046. The structure is 126 ft (38.4 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPetaluma Blvd N
CrossesPetaluma River
Location0.2 MI S JCT US 101
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.26771, -122.67062
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating17.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length126 ft (38.4 m)
Longest span28 ft (8.5 m)
Deck width33 ft (10.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2010)
Projected traffic10,903 by 2046
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 Petaluma Blvd N over Petaluma River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Petaluma Blvd N over Petaluma River 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 April 2024.

How much traffic does Petaluma Blvd N over Petaluma River carry?

About 4,200 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Petaluma Blvd N over Petaluma River?

The structure is 126 ft (38.4 m) long with a longest span of 28 ft (8.5 m) and a deck 33 ft wide.

Who owns Petaluma Blvd N over Petaluma River?

It is owned by the City or Municipal Highway Agency.