US Bridges

Cottonwood Drive over Grayson Creek

Fair

Contra Costa County, California · 0.1 MI W Contra Costa Bl · Structure no. 28C0454

Built
1970
55 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
58 ft
3 main spans
Daily traffic
2,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cottonwood Drive over Grayson Creek is a concrete continuous culvert carrying Cottonwood Drive over Grayson Creek in Contra Costa County, California. It was built in 1970, so it is 55 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 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 3,998 by 2047. The structure is 58 ft (17.7 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCottonwood Drive
CrossesGrayson Creek
Location0.1 MI W Contra Costa Bl
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.97358, -122.06547
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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable 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 spans3
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width50 ft (15.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2020)
Projected traffic3,998 by 2047
Trucks2%
Lanes on structure2
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 Cottonwood Drive over Grayson Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Cottonwood Drive over Grayson 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 February 2025.

How much traffic does Cottonwood Drive over Grayson Creek carry?

About 2,000 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Cottonwood Drive over Grayson Creek?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 50 ft wide.

Who owns Cottonwood Drive over Grayson Creek?

It is owned by the City or Municipal Highway Agency.