US Bridges

State Route 4 over Duck Creek

Good

San Joaquin County, California · 10-SJ-004-36.80 · Structure no. 29 0056

Built
1988
37 years old
Condition
Good
inspected June 2021
Type
Slab
Concrete Continuous
Length
42 ft
2 main spans
Daily traffic
4,800
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 4 over Duck Creek is a concrete continuous slab carrying State Route 4 over Duck Creek in San Joaquin County, California. It was built in 1988, so it is 37 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,800 vehicles a day, roughly 6% of them trucks, projected to reach 9,238 by 2043. The structure is 42 ft (12.8 m) long and 44 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesState Route 4
CrossesDuck Creek
Location10-SJ-004-36.80
RouteState Highway 4
CountySan Joaquin County
StateCalifornia
Coordinates37.94073, -120.94467
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span21 ft (6.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (2009)
Projected traffic9,238 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 State Route 4 over Duck Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is State Route 4 over Duck Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2021.

How much traffic does State Route 4 over Duck Creek carry?

About 4,800 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 4 over Duck Creek?

The structure is 42 ft (12.8 m) long with a longest span of 21 ft (6.4 m) and a deck 44 ft wide.

Who owns State Route 4 over Duck Creek?

It is owned by the State Highway Agency.