US Bridges

Rockpile Road over Warm Springs Creek

Good

Sonoma County, California · 3.5 MI JCT Dutcher Crk RD · Structure no. 20C0438

Built
1978
47 years old
Condition
Good
inspected July 2023
Type
Truss - Deck
Steel Continuous
Length
1,788 ft
3 main spans
Daily traffic
1,650
2011 count
Owner
County
County Highway Agency

About this bridge

Rockpile Road over Warm Springs Creek is a steel continuous truss - deck carrying Rockpile Road over Warm Springs Creek in Sonoma County, California. It was built in 1978, so it is 47 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 1,650 vehicles a day, roughly 3% of them trucks, projected to reach 2,810 by 2043. The structure is 1,788 ft (545 m) long and 39 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesRockpile Road
CrossesWarm Springs Creek
Location3.5 MI JCT Dutcher Crk RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.71589, -123.01792
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTruss - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length1,788 ft (545 m)
Longest span752 ft (229.2 m)
Deck width39 ft (12 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2011)
Projected traffic2,810 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rockpile Road over Warm Springs Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Rockpile Road over Warm Springs 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 Rockpile Road over Warm Springs Creek carry?

About 1,650 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Rockpile Road over Warm Springs Creek?

The structure is 1,788 ft (545 m) long with a longest span of 752 ft (229.2 m) and a deck 39 ft wide.

Who owns Rockpile Road over Warm Springs Creek?

It is owned by the County Highway Agency.