US Bridges

State Route 4 over Duck Creek

Fair

San Joaquin County, California · 10-SJ-004-R22.72 · Structure no. 29 0053

Built
1951
74 years old, rebuilt 1977
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
4,550
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 4 over Duck Creek is a concrete continuous culvert carrying State Route 4 over Duck Creek in San Joaquin County, California. It was built in 1951 and reconstructed in 1977, so it is 74 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 4,550 vehicles a day, projected to reach 9,874 by 2045. The structure is 26 ft (7.9 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesState Route 4
CrossesDuck Creek
Location10-SJ-004-R22.72
RouteState Highway 4
CountySan Joaquin County
StateCalifornia
Coordinates37.94923, -121.18231
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width52 ft (15.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2009)
Projected traffic9,874 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 1951, making it 74 years old in 2025. It was reconstructed in 1977.

What condition is State Route 4 over Duck 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 August 2023.

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

About 4,550 vehicles per day (2009 count).

How long is State Route 4 over Duck Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 52 ft wide.

Who owns State Route 4 over Duck Creek?

It is owned by the State Highway Agency.