US Bridges

Railroad Ave over Dowdall Creek

Fair

Sonoma County, California · 0.3 MI S/O Verano · Structure no. 20C0261

Built
1961
64 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
524
2015 count
Owner
County
County Highway Agency

About this bridge

Railroad Ave over Dowdall Creek is a concrete continuous culvert carrying Railroad Ave over Dowdall Creek in Sonoma County, California. It was built in 1961, so it is 64 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 524 vehicles a day, roughly 1% of them trucks, projected to reach 712 by 2040. The structure is 28 ft (8.5 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRailroad Ave
CrossesDowdall Creek
Location0.3 MI S/O Verano
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.29895, -122.48547
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span13 ft (4.1 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic524 (2015)
Projected traffic712 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Railroad Ave over Dowdall Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Railroad Ave over Dowdall 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 May 2023.

How much traffic does Railroad Ave over Dowdall Creek carry?

About 524 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Railroad Ave over Dowdall Creek?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4.1 m) and a deck 26 ft wide.

Who owns Railroad Ave over Dowdall Creek?

It is owned by the County Highway Agency.