US Bridges

Austin Creek Road over Hillside

Fair

Sonoma County, California · Just S/O Kramer Road · Structure no. 20C0585

Built
2015
10 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
108 ft
6 main spans
Daily traffic
200
2015 count
Owner
County
County Highway Agency

About this bridge

Austin Creek Road over Hillside is a steel stringer/multi-beam or girder carrying Austin Creek Road over Hillside in Sonoma County, California. It was built in 2015, so it is 10 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 5 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 200 vehicles a day, projected to reach 224 by 2046. The structure is 108 ft (33 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesAustin Creek Road
CrossesHillside
LocationJust S/O Kramer Road
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.5257, -123.08966
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans6
Design loadHS 20
Structure length108 ft (33 m)
Longest span18 ft (5.6 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2015)
Projected traffic224 by 2046
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed3.7 mi (6 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 Austin Creek Road over Hillside built?

It was built in 2015, making it 10 years old in 2025.

What condition is Austin Creek Road 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 June 2024.

How much traffic does Austin Creek Road over Hillside carry?

About 200 vehicles per day (2015 count).

How long is Austin Creek Road over Hillside?

The structure is 108 ft (33 m) long with a longest span of 18 ft (5.6 m) and a deck 16 ft wide.

Who owns Austin Creek Road over Hillside?

It is owned by the County Highway Agency.