US Bridges

EB 4 Off-Ramp over Mormon Slough

Fair

San Joaquin County, California · 10-SJ-004-R16.20-STKN · Structure no. 29 0238S

Built
1972
53 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
132 ft
5 main spans
Daily traffic
4,700
2000 count
Owner
State
State Highway Agency

About this bridge

EB 4 Off-Ramp over Mormon Slough is a concrete continuous slab carrying EB 4 Off-Ramp over Mormon Slough in San Joaquin County, California. It was built in 1972, so it is 53 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 4,700 vehicles a day, roughly 10% of them trucks, projected to reach 7,615 by 2041. The structure is 132 ft (40.2 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesEB 4 Off-Ramp
CrossesMormon Slough
Location10-SJ-004-R16.20-STKN
RouteState Highway 4
CountySan Joaquin County
StateCalifornia
Coordinates37.94836, -121.29792
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length132 ft (40.2 m)
Longest span28 ft (8.5 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2000)
Projected traffic7,615 by 2041
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was EB 4 Off-Ramp over Mormon Slough built?

It was built in 1972, making it 53 years old in 2025.

What condition is EB 4 Off-Ramp over Mormon 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 June 2023.

How much traffic does EB 4 Off-Ramp over Mormon Slough carry?

About 4,700 vehicles per day (2000 count), of which roughly 10% are trucks.

How long is EB 4 Off-Ramp over Mormon Slough?

The structure is 132 ft (40.2 m) long with a longest span of 28 ft (8.5 m) and a deck 34 ft wide.

Who owns EB 4 Off-Ramp over Mormon Slough?

It is owned by the State Highway Agency.