US Bridges

W College Ave over College Creek

Fair

Sonoma County, California · 0.05 MI W Marlow RD · Structure no. 20C0162

Built
1935
90 years old, rebuilt 1981
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
21 ft
3 main spans
Daily traffic
26,000
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

W College Ave over College Creek is a concrete continuous culvert carrying W College Ave over College Creek in Sonoma County, California. It was built in 1935 and reconstructed in 1981, so it is 90 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 26,000 vehicles a day, roughly 2% of them trucks, projected to reach 14,121 by 2041. The structure is 21 ft (6.4 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesW College Ave
CrossesCollege Creek
Location0.05 MI W Marlow RD
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.44515, -122.75289
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span11 ft (3.4 m)
Deck width74 ft (22.6 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,000 (2019)
Projected traffic14,121 by 2041
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 W College Ave over College Creek built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1981.

What condition is W College Ave over College 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 2024.

How much traffic does W College Ave over College Creek carry?

About 26,000 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is W College Ave over College Creek?

The structure is 21 ft (6.4 m) long with a longest span of 11 ft (3.4 m) and a deck 74 ft wide.

Who owns W College Ave over College Creek?

It is owned by the City or Municipal Highway Agency.