US Bridges

Acampo Road over State Route 99

Poor

San Joaquin County, California · 10-SJ-099-33.57 · Structure no. 29 0146

Built
1957
68 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
182 ft
4 main spans
Daily traffic
1,600
2014 count
Owner
State
State Highway Agency

About this bridge

Acampo Road over State Route 99 is a steel stringer/multi-beam or girder carrying Acampo Road over State Route 99 in San Joaquin County, California. It was built in 1957, so it is 68 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,600 vehicles a day, roughly 10% of them trucks, projected to reach 1,870 by 2042. The structure is 182 ft (55.5 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAcampo Road
CrossesState Route 99
Location10-SJ-099-33.57
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates38.17466, -121.26267
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length182 ft (55.5 m)
Longest span58 ft (17.7 m)
Deck width34 ft (10.3 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2014)
Projected traffic1,870 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$962,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Acampo Road over State Route 99 built?

It was built in 1957, making it 68 years old in 2025.

What condition is Acampo Road over State Route 99 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Acampo Road over State Route 99 carry?

About 1,600 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Acampo Road over State Route 99?

The structure is 182 ft (55.5 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.

Who owns Acampo Road over State Route 99?

It is owned by the State Highway Agency.