US Bridges

Geysers RD over Frasier Creek

Fair

Sonoma County, California · 20.4 MI N of SR 128 · Structure no. 20C0227

Built
1941
84 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
41 ft
2 main spans
Daily traffic
250
2012 count
Owner
County
County Highway Agency

About this bridge

Geysers RD over Frasier Creek is a concrete continuous slab carrying Geysers RD over Frasier Creek in Sonoma County, California. It was built in 1941, so it is 84 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 250 vehicles a day, roughly 5% of them trucks, projected to reach 557 by 2043. The structure is 41 ft (12.5 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesGeysers RD
CrossesFrasier Creek
Location20.4 MI N of SR 128
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.8283, -122.912
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating30.3 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span19 ft (5.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2012)
Projected traffic557 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Geysers RD over Frasier Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is Geysers RD over Frasier 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 July 2023.

How much traffic does Geysers RD over Frasier Creek carry?

About 250 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is Geysers RD over Frasier Creek?

The structure is 41 ft (12.5 m) long with a longest span of 19 ft (5.8 m) and a deck 24 ft wide.

Who owns Geysers RD over Frasier Creek?

It is owned by the County Highway Agency.