US Bridges

Standiford Ave over State Route 99

Fair

Stanislaus County, California · 10-STA-099-R20.22-MOD · Structure no. 38 0149

Built
1976
49 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
227 ft
2 main spans
Daily traffic
4,700
2011 count
Owner
State
State Highway Agency

About this bridge

Standiford Ave over State Route 99 is a prestressed concrete continuous box beam or girders - multiple carrying Standiford Ave over State Route 99 in Stanislaus County, California. It was built in 1976, so it is 49 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 6 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 4,700 vehicles a day, roughly 3% of them trucks, projected to reach 7,962 by 2041. The structure is 227 ft (69.2 m) long and 93 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesStandiford Ave
CrossesState Route 99
Location10-STA-099-R20.22-MOD
RouteCity Street 0
CountyStanislaus County
StateCalifornia
Coordinates37.68325, -121.05331
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 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 rating55.7 US tons
Inventory rating33.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span117 ft (35.8 m)
Deck width93 ft (28.3 m)
Roadway width81 ft (24.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2011)
Projected traffic7,962 by 2041
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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 Standiford Ave over State Route 99 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Standiford Ave over State Route 99 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 March 2023.

How much traffic does Standiford Ave over State Route 99 carry?

About 4,700 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is Standiford Ave over State Route 99?

The structure is 227 ft (69.2 m) long with a longest span of 117 ft (35.8 m) and a deck 93 ft wide.

Who owns Standiford Ave over State Route 99?

It is owned by the State Highway Agency.