US Bridges

Geysers RD over Little Sulphur Creek

Good

Sonoma County, California · 8.5 MI N of SH 128 · Structure no. 20C0230

Built
1983
42 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
153 ft
3 main spans
Daily traffic
500
2011 count
Owner
County
County Highway Agency

About this bridge

Geysers RD over Little Sulphur Creek is a concrete continuous box beam or girders - multiple carrying Geysers RD over Little Sulphur Creek in Sonoma County, California. It was built in 1983, so it is 42 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 500 vehicles a day, roughly 1% of them trucks, projected to reach 873 by 2041. The structure is 153 ft (46.5 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesGeysers RD
CrossesLittle Sulphur Creek
Location8.5 MI N of SH 128
RouteCounty Highway 0
Coordinates38.76437, -122.81741
Functional classRural Minor 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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating83.2 US tons
Inventory rating50 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length153 ft (46.5 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2011)
Projected traffic873 by 2041
Trucks1%
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 Little Sulphur Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Geysers RD over Little Sulphur 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 July 2023.

How much traffic does Geysers RD over Little Sulphur Creek carry?

About 500 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Geysers RD over Little Sulphur Creek?

The structure is 153 ft (46.5 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns Geysers RD over Little Sulphur Creek?

It is owned by the County Highway Agency.