US Bridges

Piner Road over Piner Creek

Fair

Sonoma County, California · In Santa Rosa · Structure no. 20C0180

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
46 ft
3 main spans
Daily traffic
5,900
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Piner Road over Piner Creek is a concrete continuous slab carrying Piner Road over Piner 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 5,900 vehicles a day, roughly 3% of them trucks, projected to reach 6,371 by 2045. The structure is 46 ft (14 m) long and 76 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesPiner Road
CrossesPiner Creek
LocationIn Santa Rosa
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.46908, -122.74317
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.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length46 ft (14 m)
Longest span17 ft (5.2 m)
Deck width76 ft (23.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,900 (2019)
Projected traffic6,371 by 2045
Trucks3%
Lanes on structure4
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 Piner Road over Piner Creek built?

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

What condition is Piner Road over Piner 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 Piner Road over Piner Creek carry?

About 5,900 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Piner Road over Piner Creek?

The structure is 46 ft (14 m) long with a longest span of 17 ft (5.2 m) and a deck 76 ft wide.

Who owns Piner Road over Piner Creek?

It is owned by the City or Municipal Highway Agency.