US Bridges

Mountain House RD over California Aqueduct

Poor

San Joaquin County, California · 0.1 MI S Schulte RD · Structure no. 29C0083R

Built
1967
58 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
155 ft
2 main spans
Daily traffic
4,403
2009 count
Owner
County
County Highway Agency

About this bridge

Mountain House RD over California Aqueduct is a concrete continuous tee beam carrying Mountain House RD over California Aqueduct in San Joaquin County, California. It was built in 1967, so it is 58 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 4,403 vehicles a day, roughly 50% of them trucks, projected to reach 6,244 by 2046. The structure is 155 ft (47.2 m) long and 34 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesMountain House RD
CrossesCalifornia Aqueduct
Location0.1 MI S Schulte RD
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates37.72072, -121.5335
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span78 ft (23.8 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,403 (2009)
Projected traffic6,244 by 2046
Trucks50%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$829,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mountain House RD over California Aqueduct built?

It was built in 1967, making it 58 years old in 2025.

What condition is Mountain House RD over California Aqueduct 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 June 2024.

How much traffic does Mountain House RD over California Aqueduct carry?

About 4,403 vehicles per day (2009 count), of which roughly 50% are trucks.

How long is Mountain House RD over California Aqueduct?

The structure is 155 ft (47.2 m) long with a longest span of 78 ft (23.8 m) and a deck 34 ft wide.

Who owns Mountain House RD over California Aqueduct?

It is owned by the County Highway Agency.