US Bridges

State Route 4 over Rock Creek

Fair

Stanislaus County, California · 10-STA-004-R1.68 · Structure no. 38 0040

Built
1977
48 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
4,900
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 4 over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying State Route 4 over Rock Creek in Stanislaus County, California. It was built in 1977, so it is 48 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 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 4,900 vehicles a day, roughly 8% of them trucks, projected to reach 6,345 by 2042. The structure is 96 ft (29.3 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

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CarriesState Route 4
CrossesRock Creek
Location10-STA-004-R1.68
RouteState Highway 4
CountyStanislaus County
StateCalifornia
Coordinates37.94494, -120.89643
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length96 ft (29.3 m)
Longest span94 ft (28.7 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,900 (2015)
Projected traffic6,345 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Rock Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is State Route 4 over Rock 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 May 2024.

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

About 4,900 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is State Route 4 over Rock Creek?

The structure is 96 ft (29.3 m) long with a longest span of 94 ft (28.7 m) and a deck 35 ft wide.

Who owns State Route 4 over Rock Creek?

It is owned by the State Highway Agency.