US Bridges

Monte Rio Ave over Hillside

Fair

Sonoma County, California · 0.2 MI NE Bohemian Ave · Structure no. 20C0477

Built
1983
42 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
4 main spans
Daily traffic
100
2015 count
Owner
County
County Highway Agency

About this bridge

Monte Rio Ave over Hillside is a steel stringer/multi-beam or girder carrying Monte Rio Ave over Hillside 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 fair condition with a lowest component rating of 6 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 100 vehicles a day, projected to reach 109 by 2042. The structure is 76 ft (23.2 m) long and 7 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMonte Rio Ave
CrossesHillside
Location0.2 MI NE Bohemian Ave
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.4659, -123.00726
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans4
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span19 ft (5.8 m)
Deck width7 ft (2.2 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2015)
Projected traffic109 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
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 Monte Rio Ave over Hillside built?

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

What condition is Monte Rio Ave over Hillside 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 November 2024.

How much traffic does Monte Rio Ave over Hillside carry?

About 100 vehicles per day (2015 count).

How long is Monte Rio Ave over Hillside?

The structure is 76 ft (23.2 m) long with a longest span of 19 ft (5.8 m) and a deck 7 ft wide.

Who owns Monte Rio Ave over Hillside?

It is owned by the County Highway Agency.