US Bridges

N Mcdowell Blvd over Willow Brook Creek

Fair

Sonoma County, California · N of Willowbrook Ct · Structure no. 20C0562

Built
1992
33 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
108 ft
1 main span
Daily traffic
500
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Mcdowell Blvd over Willow Brook Creek is a prestressed concrete box beam or girders - multiple carrying N Mcdowell Blvd over Willow Brook Creek in Sonoma County, California. It was built in 1992, so it is 33 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 500 vehicles a day, roughly 3% of them trucks, projected to reach 614 by 2045. The structure is 108 ft (33 m) long and 54 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesN Mcdowell Blvd
CrossesWillow Brook Creek
LocationN of Willowbrook Ct
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.27747, -122.67159
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length108 ft (33 m)
Longest span104 ft (31.7 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2015)
Projected traffic614 by 2045
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesWaterway
Detour if closed0.6 mi (1 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 N Mcdowell Blvd over Willow Brook Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is N Mcdowell Blvd over Willow Brook 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 N Mcdowell Blvd over Willow Brook Creek carry?

About 500 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is N Mcdowell Blvd over Willow Brook Creek?

The structure is 108 ft (33 m) long with a longest span of 104 ft (31.7 m) and a deck 54 ft wide.

Who owns N Mcdowell Blvd over Willow Brook Creek?

It is owned by the City or Municipal Highway Agency.