US Bridges

Main ST over SR 120

Good

San Joaquin County, California · 10-SJ-120-R5.31-MTCA · Structure no. 29 0276

Built
1980
45 years old, rebuilt 1995
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
215 ft
2 main spans
Daily traffic
7,000
2009 count
Owner
State
State Highway Agency

About this bridge

Main ST over SR 120 is a prestressed concrete continuous box beam or girders - multiple carrying Main ST over SR 120 in San Joaquin County, California. It was built in 1980 and reconstructed in 1995, so it is 45 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,000 vehicles a day, roughly 2% of them trucks, projected to reach 9,973 by 2041. The structure is 215 ft (65.4 m) long and 44 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesMain ST
CrossesSR 120
Location10-SJ-120-R5.31-MTCA
RouteCity Street 0
Coordinates37.78366, -121.21589
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length215 ft (65.4 m)
Longest span107 ft (32.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2009)
Projected traffic9,973 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.2 mi (18 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Main ST over SR 120 built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 1995.

What condition is Main ST over SR 120 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Main ST over SR 120 carry?

About 7,000 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is Main ST over SR 120?

The structure is 215 ft (65.4 m) long with a longest span of 107 ft (32.5 m) and a deck 44 ft wide.

Who owns Main ST over SR 120?

It is owned by the State Highway Agency.