US Bridges

Imhoff Road over Central Sanitary RD

Fair

Contra Costa County, California · 1.2 Mi. W. of Solano Way · Structure no. 28C0179

Built
1975
50 years old
Condition
Fair
inspected November 2024
Type
Frame
Concrete
Length
42 ft
1 main span
Daily traffic
1,000
2013 count
Owner
County
County Highway Agency

About this bridge

Imhoff Road over Central Sanitary RD is a concrete frame carrying Imhoff Road over Central Sanitary RD in Contra Costa County, California. It was built in 1975, so it is 50 years old, younger 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 1,000 vehicles a day, roughly 2% of them trucks, projected to reach 1,637 by 2046. The structure is 42 ft (12.8 m) long and 130 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesImhoff Road
CrossesCentral Sanitary RD
Location1.2 Mi. W. of Solano Way
RouteCounty Highway 0
CountyContra Costa County
StateCalifornia
Coordinates37.99972, -122.07004
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.3 US tons
Inventory rating47.2 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span40 ft (12.3 m)
Deck width130 ft (39.6 m)
Roadway width114 ft (34.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2013)
Projected traffic1,637 by 2046
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Imhoff Road over Central Sanitary RD built?

It was built in 1975, making it 50 years old in 2025.

What condition is Imhoff Road over Central Sanitary RD 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 November 2024.

How much traffic does Imhoff Road over Central Sanitary RD carry?

About 1,000 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Imhoff Road over Central Sanitary RD?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.3 m) and a deck 130 ft wide.

Who owns Imhoff Road over Central Sanitary RD?

It is owned by the County Highway Agency.