US Bridges

Hoffman Lane over Kellogg Creek

Fair

Contra Costa County, California · 1.0 MI S Marsh Creek RD · Structure no. 28C0175

Built
1952
73 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
26 ft
1 main span
Daily traffic
334
2013 count
Owner
County
County Highway Agency

About this bridge

Hoffman Lane over Kellogg Creek is a wood or timber stringer/multi-beam or girder carrying Hoffman Lane over Kellogg Creek in Contra Costa County, California. It was built in 1952, so it is 73 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 334 vehicles a day, roughly 7% of them trucks, projected to reach 329 by 2046. The structure is 26 ft (7.9 m) long and 20 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesHoffman Lane
CrossesKellogg Creek
Location1.0 MI S Marsh Creek RD
RouteCounty Highway 0
CountyContra Costa County
StateCalifornia
Coordinates37.88192, -121.67124
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating31.4 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span24 ft (7.2 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic334 (2013)
Projected traffic329 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Hoffman Lane over Kellogg Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is Hoffman Lane over Kellogg 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 July 2024.

How much traffic does Hoffman Lane over Kellogg Creek carry?

About 334 vehicles per day (2013 count), of which roughly 7% are trucks.

How long is Hoffman Lane over Kellogg Creek?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.2 m) and a deck 20 ft wide.

Who owns Hoffman Lane over Kellogg Creek?

It is owned by the County Highway Agency.