US Bridges

Petrified Forst RD over Cyrus Creek

Good

Napa County, California · 0.5 MI W of SR 128 · Structure no. 21C0119

Built
1989
36 years old
Condition
Good
inspected August 2021
Type
Arch - Deck
Concrete
Length
22 ft
1 main span
Daily traffic
9,783
2014 count
Owner
County
County Highway Agency

About this bridge

Petrified Forst RD over Cyrus Creek is a concrete arch - deck carrying Petrified Forst RD over Cyrus Creek in Napa County, California. It was built in 1989, so it is 36 years old, younger 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 9,783 vehicles a day, roughly 9% of them trucks, projected to reach 19,181 by 2043. The structure is 22 ft (6.7 m) long and 31 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

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CarriesPetrified Forst RD
CrossesCyrus Creek
Location0.5 MI W of SR 128
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.57821, -122.60546
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width31 ft (9.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,783 (2014)
Projected traffic19,181 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Petrified Forst RD over Cyrus Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Petrified Forst RD over Cyrus 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 August 2021.

How much traffic does Petrified Forst RD over Cyrus Creek carry?

About 9,783 vehicles per day (2014 count), of which roughly 9% are trucks.

How long is Petrified Forst RD over Cyrus Creek?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 31 ft wide.

Who owns Petrified Forst RD over Cyrus Creek?

It is owned by the County Highway Agency.