US Bridges

Bacon Island Road over Middle River

Fair

San Joaquin County, California · 1.3 MI N/O W Low Jones RD · Structure no. 29C0108

Built
1995
30 years old
Condition
Fair
inspected February 2025
Type
Movable - Swing
Steel
Length
975 ft
2 main spans
Daily traffic
480
2015 count
Owner
County
County Highway Agency

About this bridge

Bacon Island Road over Middle River is a steel movable - swing carrying Bacon Island Road over Middle River in San Joaquin County, California. It was built in 1995, so it is 30 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 480 vehicles a day, roughly 5% of them trucks, projected to reach 1,114 by 2045. The structure is 975 ft (297.2 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesBacon Island Road
CrossesMiddle River
Location1.3 MI N/O W Low Jones RD
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates37.95622, -121.52946
Functional classRural Local

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 protection9 ExcellentNo problems noted.
Last inspectionFebruary 2025
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.3 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+23 approach)
Design loadHS 20 + Mod
Structure length975 ft (297.2 m)
Longest span120 ft (36.6 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2015)
Projected traffic1,114 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Bacon Island Road over Middle River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Bacon Island Road over Middle 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 February 2025.

How much traffic does Bacon Island Road over Middle River carry?

About 480 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Bacon Island Road over Middle River?

The structure is 975 ft (297.2 m) long with a longest span of 120 ft (36.6 m) and a deck 31 ft wide.

Who owns Bacon Island Road over Middle River?

It is owned by the County Highway Agency.