US Bridges

Rockpile Road over Boat Launch Uc

Good

Sonoma County, California · 0.5 MI W Stwt Pt-Sk SP RD · Structure no. 20C0489

Built
1985
40 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
110 ft
3 main spans
Daily traffic
2,400
2012 count
Owner
County
County Highway Agency

About this bridge

Rockpile Road over Boat Launch Uc is a concrete continuous slab carrying Rockpile Road over Boat Launch Uc in Sonoma County, California. It was built in 1985, so it is 40 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 2,400 vehicles a day, roughly 3% of them trucks, projected to reach 2,876 by 2041. The structure is 110 ft (33.6 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesRockpile Road
CrossesBoat Launch Uc
Location0.5 MI W Stwt Pt-Sk SP RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.71593, -123.01978
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.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length110 ft (33.6 m)
Longest span38 ft (11.6 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2012)
Projected traffic2,876 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rockpile Road over Boat Launch Uc built?

It was built in 1985, making it 40 years old in 2025.

What condition is Rockpile Road over Boat Launch Uc 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 Boat Launch Uc carry?

About 2,400 vehicles per day (2012 count), of which roughly 3% are trucks.

How long is Rockpile Road over Boat Launch Uc?

The structure is 110 ft (33.6 m) long with a longest span of 38 ft (11.6 m) and a deck 37 ft wide.

Who owns Rockpile Road over Boat Launch Uc?

It is owned by the County Highway Agency.