US Bridges

Myrtle Street over State Route 99 & Ramps

Fair

San Joaquin County, California · 10-SJ-099-18.89 · Structure no. 29 0308

Built
1991
34 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
313 ft
2 main spans
Daily traffic
500
1998 count
Owner
State
State Highway Agency

About this bridge

Myrtle Street over State Route 99 & Ramps is a prestressed concrete continuous box beam or girders - multiple carrying Myrtle Street over State Route 99 & Ramps in San Joaquin County, California. It was built in 1991, so it is 34 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 500 vehicles a day, roughly 3% of them trucks, projected to reach 1,664 by 2046. The structure is 313 ft (95.5 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMyrtle Street
CrossesState Route 99 & Ramps
Location10-SJ-099-18.89
RouteCounty Highway 0
Coordinates37.96414, -121.24349
Functional classUrban Minor Arterial

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.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum 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 length313 ft (95.5 m)
Longest span170 ft (51.8 m)
Deck width52 ft (15.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (1998)
Projected traffic1,664 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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 Myrtle Street over State Route 99 & Ramps built?

It was built in 1991, making it 34 years old in 2025.

What condition is Myrtle Street over State Route 99 & Ramps 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 June 2024.

How much traffic does Myrtle Street over State Route 99 & Ramps carry?

About 500 vehicles per day (1998 count), of which roughly 3% are trucks.

How long is Myrtle Street over State Route 99 & Ramps?

The structure is 313 ft (95.5 m) long with a longest span of 170 ft (51.8 m) and a deck 52 ft wide.

Who owns Myrtle Street over State Route 99 & Ramps?

It is owned by the State Highway Agency.