US Bridges

Stony Point RD over Willow Brook Creek

Good

Sonoma County, California · 0.5 MI N Intx Petlma Bl · Structure no. 20C0118

Built
1961
64 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
72 ft
3 main spans
Daily traffic
10,855
2013 count
Owner
City
City or Municipal Highway Agency

About this bridge

Stony Point RD over Willow Brook Creek is a concrete continuous slab carrying Stony Point RD over Willow Brook Creek in Sonoma County, California. It was built in 1961, so it is 64 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,855 vehicles a day, roughly 4% of them trucks, projected to reach 13,522 by 2045. The structure is 72 ft (22 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesStony Point RD
CrossesWillow Brook Creek
Location0.5 MI N Intx Petlma Bl
RouteCity Street 0
Coordinates38.27421, -122.67701
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length72 ft (22 m)
Longest span28 ft (8.6 m)
Deck width40 ft (12.2 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,855 (2013)
Projected traffic13,522 by 2045
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Stony Point RD over Willow Brook Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Stony Point RD over Willow Brook Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Stony Point RD over Willow Brook Creek carry?

About 10,855 vehicles per day (2013 count), of which roughly 4% are trucks.

How long is Stony Point RD over Willow Brook Creek?

The structure is 72 ft (22 m) long with a longest span of 28 ft (8.6 m) and a deck 40 ft wide.

Who owns Stony Point RD over Willow Brook Creek?

It is owned by the City or Municipal Highway Agency.