US Bridges

E24-PLEASANT Hill over Mount Diablo Boulevard

Fair

Contra Costa County, California · 04-CC-024-R7.60-LFYT · Structure no. 28 0045S

Built
1971
54 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
227 ft
3 main spans
Daily traffic
3,600
2019 count
Owner
State
State Highway Agency

About this bridge

E24-PLEASANT Hill over Mount Diablo Boulevard is a concrete continuous box beam or girders - multiple carrying E24-PLEASANT Hill over Mount Diablo Boulevard in Contra Costa County, California. It was built in 1971, so it is 54 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 3,600 vehicles a day, roughly 1% of them trucks, projected to reach 4,391 by 2045. The structure is 227 ft (69.2 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesE24-PLEASANT Hill
CrossesMount Diablo Boulevard
Location04-CC-024-R7.60-LFYT
RouteState Highway 24
CountyContra Costa County
StateCalifornia
Coordinates37.89678, -122.09743
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating63.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span90 ft (27.4 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2019)
Projected traffic4,391 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 E24-PLEASANT Hill over Mount Diablo Boulevard built?

It was built in 1971, making it 54 years old in 2025.

What condition is E24-PLEASANT Hill over Mount Diablo Boulevard 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 June 2023.

How much traffic does E24-PLEASANT Hill over Mount Diablo Boulevard carry?

About 3,600 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is E24-PLEASANT Hill over Mount Diablo Boulevard?

The structure is 227 ft (69.2 m) long with a longest span of 90 ft (27.4 m) and a deck 28 ft wide.

Who owns E24-PLEASANT Hill over Mount Diablo Boulevard?

It is owned by the State Highway Agency.