US Bridges

Boyd RD over E. Fork Grayson Creek

Fair

Contra Costa County, California · 0.3 MI W Contra Costa Bl · Structure no. 28C0346

Built
1954
71 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
7,400
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boyd RD over E. Fork Grayson Creek is a concrete continuous culvert carrying Boyd RD over E. Fork Grayson Creek in Contra Costa County, California. It was built in 1954, so it is 71 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 7,400 vehicles a day, roughly 3% of them trucks, projected to reach 17,135 by 2047. The structure is 28 ft (8.6 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBoyd RD
CrossesE. Fork Grayson Creek
Location0.3 MI W Contra Costa Bl
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.94341, -122.06567
Functional classUrban Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum 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 (8.6 m)
Longest span14 ft (4.3 m)
Deck width46 ft (14 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,400 (2020)
Projected traffic17,135 by 2047
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Boyd RD over E. Fork Grayson Creek built?

It was built in 1954, making it 71 years old in 2025.

What condition is Boyd RD over E. Fork 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 Boyd RD over E. Fork Grayson Creek carry?

About 7,400 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Boyd RD over E. Fork Grayson Creek?

The structure is 28 ft (8.6 m) long with a longest span of 14 ft (4.3 m) and a deck 46 ft wide.

Who owns Boyd RD over E. Fork Grayson Creek?

It is owned by the City or Municipal Highway Agency.