US Bridges

Hoen Avenue over Matanzas Creek

Good

Sonoma County, California · 0.1 M West of Cypress Wy · Structure no. 20C0073

Built
1972
53 years old
Condition
Good
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
95 ft
3 main spans
Daily traffic
22,000
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hoen Avenue over Matanzas Creek is a concrete continuous tee beam carrying Hoen Avenue over Matanzas Creek in Sonoma County, California. It was built in 1972, so it is 53 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 22,000 vehicles a day, roughly 2% of them trucks, projected to reach 14,671 by 2042. The structure is 95 ft (29 m) long and 65 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesHoen Avenue
CrossesMatanzas Creek
Location0.1 M West of Cypress Wy
RouteCity Street 0
Coordinates38.43737, -122.68252
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating90.4 US tons
Inventory rating54.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length95 ft (29 m)
Longest span45 ft (13.7 m)
Deck width65 ft (19.8 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2010)
Projected traffic14,671 by 2042
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hoen Avenue over Matanzas Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Hoen Avenue over Matanzas Creek 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 August 2024.

How much traffic does Hoen Avenue over Matanzas Creek carry?

About 22,000 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Hoen Avenue over Matanzas Creek?

The structure is 95 ft (29 m) long with a longest span of 45 ft (13.7 m) and a deck 65 ft wide.

Who owns Hoen Avenue over Matanzas Creek?

It is owned by the City or Municipal Highway Agency.