US Bridges

Coffey Lane over Piner Creek

Fair

Sonoma County, California · 0.1 Miles S/O Piner Road · Structure no. 20C0181

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
3,100
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coffey Lane over Piner Creek is a concrete continuous culvert carrying Coffey Lane 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 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 3,100 vehicles a day, roughly 2% of them trucks, projected to reach 4,247 by 2045. The structure is 26 ft (7.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCoffey Lane
CrossesPiner Creek
Location0.1 Miles S/O Piner Road
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.46763, -122.74433
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (7.8 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2019)
Projected traffic4,247 by 2045
Trucks2%
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 Coffey Lane over Piner Creek built?

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

What condition is Coffey Lane 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 Coffey Lane over Piner Creek carry?

About 3,100 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Coffey Lane over Piner Creek?

The structure is 26 ft (7.8 m) long with a longest span of 11 ft (3.5 m).

Who owns Coffey Lane over Piner Creek?

It is owned by the City or Municipal Highway Agency.