US Bridges

E Cotati Ave over Flood Control Ditch

Fair

Sonoma County, California · 0.1 MI NE Old Redwood HWY · Structure no. 20C0204

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
3,000
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

E Cotati Ave over Flood Control Ditch is a concrete continuous culvert carrying E Cotati Ave over Flood Control Ditch in Sonoma County, California. It was built in 1960, so it is 65 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 3,000 vehicles a day, roughly 1% of them trucks, projected to reach 5,398 by 2044. The structure is 22 ft (6.7 m) long and 84 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesE Cotati Ave
CrossesFlood Control Ditch
Location0.1 MI NE Old Redwood HWY
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.32698, -122.70307
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum 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 spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width84 ft (25.7 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2016)
Projected traffic5,398 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 E Cotati Ave over Flood Control Ditch built?

It was built in 1960, making it 65 years old in 2025.

What condition is E Cotati Ave over Flood Control Ditch 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 E Cotati Ave over Flood Control Ditch carry?

About 3,000 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is E Cotati Ave over Flood Control Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 84 ft wide.

Who owns E Cotati Ave over Flood Control Ditch?

It is owned by the City or Municipal Highway Agency.