US Bridges

Moscow Road over Hillside

Good

Sonoma County, California · 0.9 MI NE of SR 116 · Structure no. 20C0596

Built
2023
2 years old
Condition
Good
inspected April 2024
Type
Slab
Concrete
Length
50 ft
1 main span
Daily traffic
500
2023 count
Owner
County
County Highway Agency

About this bridge

Moscow Road over Hillside is a concrete slab carrying Moscow Road over Hillside in Sonoma County, California. It was built in 2023, so it is 2 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 5% of them trucks, projected to reach 1,200 by 2046. The structure is 50 ft (15.2 m) long and 31 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

Location

Open in Google Maps
CarriesMoscow Road
CrossesHillside
Location0.9 MI NE of SR 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.46125, -123.04253
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 protection9 ExcellentNo problems noted.
Last inspectionApril 2024
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 alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span46 ft (13.9 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic1,200 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed10.6 mi (17 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 Moscow Road over Hillside built?

It was built in 2023, making it 2 years old in 2025.

What condition is Moscow Road over Hillside 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 April 2024.

How much traffic does Moscow Road over Hillside carry?

About 500 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Moscow Road over Hillside?

The structure is 50 ft (15.2 m) long with a longest span of 46 ft (13.9 m) and a deck 31 ft wide.

Who owns Moscow Road over Hillside?

It is owned by the County Highway Agency.