US Bridges

White Road over Cunningham Slough

Fair

Contra Costa County, California · E of Stevens Road · Structure no. DAPAMCCON000451

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
131 ft
10 main spans
Daily traffic
10
2019 count
Owner
Federal
Army

About this bridge

White Road over Cunningham Slough is a wood or timber stringer/multi-beam or girder carrying White Road over Cunningham Slough in Contra Costa County, California. It was built in 1968, so it is 57 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 5 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 10 vehicles a day, projected to reach 10 by 2044. The structure is 131 ft (39.9 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesWhite Road
CrossesCunningham Slough
LocationE of Stevens Road
CountyContra Costa County
StateCalifornia
Coordinates38.05312, -122.0016
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans10
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span13 ft (3.9 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2019)
Projected traffic10 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerArmy
Maintained byArmy
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$75,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was White Road over Cunningham Slough built?

It was built in 1968, making it 57 years old in 2025.

What condition is White Road over Cunningham Slough 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 October 2023.

How much traffic does White Road over Cunningham Slough carry?

About 10 vehicles per day (2019 count).

How long is White Road over Cunningham Slough?

The structure is 131 ft (39.9 m) long with a longest span of 13 ft (3.9 m) and a deck 31 ft wide.

Who owns White Road over Cunningham Slough?

It is owned by the Army.