US Bridges

San Jon RD over Main Canal

Fair

Monterey County, California · 0.2 MI E SR 183 · Structure no. 44C0130

Built
1962
63 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
1,500
2016 count
Owner
County
County Highway Agency

About this bridge

San Jon RD over Main Canal is a concrete tee beam carrying San Jon RD over Main Canal in Monterey County, California. It was built in 1962, so it is 63 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 1,500 vehicles a day, roughly 5% of them trucks, projected to reach 2,237 by 2040. The structure is 44 ft (13.4 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesSan Jon RD
CrossesMain Canal
Location0.2 MI E SR 183
RouteCounty Highway 0
CountyMonterey County
StateCalifornia
Coordinates36.70485, -121.70514
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2016)
Projected traffic2,237 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 San Jon RD over Main Canal built?

It was built in 1962, making it 63 years old in 2025.

What condition is San Jon RD over Main Canal 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 San Jon RD over Main Canal carry?

About 1,500 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is San Jon RD over Main Canal?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 31 ft wide.

Who owns San Jon RD over Main Canal?

It is owned by the County Highway Agency.