US Bridges

Main Street over State Route 99

Good

San Joaquin County, California · 10-SJ-099-18.15-STKN · Structure no. 29 0327

Built
2016
9 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
200 ft
2 main spans
Daily traffic
20,000
2016 count
Owner
State
State Highway Agency

About this bridge

Main Street over State Route 99 is a prestressed concrete continuous box beam or girders - multiple carrying Main Street over State Route 99 in San Joaquin County, California. It was built in 2016, so it is 9 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 20,000 vehicles a day, roughly 5% of them trucks, projected to reach 25,061 by 2046. The structure is 200 ft (61 m) long and 86 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesMain Street
CrossesState Route 99
Location10-SJ-099-18.15-STKN
RouteCity Street 0
Coordinates37.95422, -121.23949
Functional classUrban Other Principal Arterial

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length200 ft (61 m)
Longest span100 ft (30.5 m)
Deck width86 ft (26.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2016)
Projected traffic25,061 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Street over State Route 99 built?

It was built in 2016, making it 9 years old in 2025.

What condition is Main Street over State Route 99 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 June 2024.

How much traffic does Main Street over State Route 99 carry?

About 20,000 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main Street over State Route 99?

The structure is 200 ft (61 m) long with a longest span of 100 ft (30.5 m) and a deck 86 ft wide.

Who owns Main Street over State Route 99?

It is owned by the State Highway Agency.