US Bridges

Hills Ferry Road over San Joaquin River

Fair

Merced County, California · Stanislaus County Line · Structure no. 39C0001

Built
1961
64 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
647 ft
5 main spans
Daily traffic
4,660
2019 count
Owner
County
County Highway Agency

About this bridge

Hills Ferry Road over San Joaquin River is a concrete continuous tee beam carrying Hills Ferry Road over San Joaquin River in Merced County, California. It was built in 1961, so it is 64 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 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 4,660 vehicles a day, roughly 37% of them trucks, projected to reach 4,362 by 2041. The structure is 647 ft (197.2 m) long and 32 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesHills Ferry Road
CrossesSan Joaquin River
LocationStanislaus County Line
RouteCounty Highway 0
Coordinates37.34858, -120.97667
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5 (+13 approach)
Design loadHS 20
Structure length647 ft (197.2 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,660 (2019)
Projected traffic4,362 by 2041
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Hills Ferry Road over San Joaquin River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Hills Ferry Road over San Joaquin River 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 October 2023.

How much traffic does Hills Ferry Road over San Joaquin River carry?

About 4,660 vehicles per day (2019 count), of which roughly 37% are trucks.

How long is Hills Ferry Road over San Joaquin River?

The structure is 647 ft (197.2 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns Hills Ferry Road over San Joaquin River?

It is owned by the County Highway Agency.