US Bridges

Redwood Road over Hinebaugh Creek

Fair

Sonoma County, California · 0.3 MI N Rohnert Pk Expwy · Structure no. 20C0466

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
65 ft
4 main spans
Daily traffic
4,000
2012 count
Owner
City
City or Municipal Highway Agency

About this bridge

Redwood Road over Hinebaugh Creek is a concrete continuous culvert carrying Redwood Road over Hinebaugh Creek in Sonoma County, California. It was built in 1970, so it is 55 years old, older 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 4,000 vehicles a day, roughly 2% of them trucks, projected to reach 6,141 by 2045. The structure is 65 ft (19.8 m) long and 75 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRedwood Road
CrossesHinebaugh Creek
Location0.3 MI N Rohnert Pk Expwy
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.35038, -122.71657
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length65 ft (19.8 m)
Longest span14 ft (4.3 m)
Deck width75 ft (22.9 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2012)
Projected traffic6,141 by 2045
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Redwood Road over Hinebaugh Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Redwood Road over Hinebaugh Creek 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 2023.

How much traffic does Redwood Road over Hinebaugh Creek carry?

About 4,000 vehicles per day (2012 count), of which roughly 2% are trucks.

How long is Redwood Road over Hinebaugh Creek?

The structure is 65 ft (19.8 m) long with a longest span of 14 ft (4.3 m) and a deck 75 ft wide.

Who owns Redwood Road over Hinebaugh Creek?

It is owned by the City or Municipal Highway Agency.