US Bridges

Murphy Road over Drain Canal

Good

San Joaquin County, California · 2.8 MI S of Mariposa RD · Structure no. 29C0329

Built
1926
99 years old, rebuilt 1982
Condition
Good
inspected January 2025
Type
Slab
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
520
2013 count
Owner
County
County Highway Agency

About this bridge

Murphy Road over Drain Canal is a concrete continuous slab carrying Murphy Road over Drain Canal in San Joaquin County, California. It was built in 1926 and reconstructed in 1982, so it is 99 years old, older 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 520 vehicles a day, roughly 5% of them trucks, projected to reach 655 by 2045. The structure is 23 ft (6.9 m) long and 29 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesMurphy Road
CrossesDrain Canal
Location2.8 MI S of Mariposa RD
RouteCounty Highway 0
Coordinates37.8508, -121.10866
Functional classRural Minor Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length23 ft (6.9 m)
Longest span11 ft (3.3 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2013)
Projected traffic655 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Murphy Road over Drain Canal built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1982.

What condition is Murphy Road over Drain Canal 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 January 2025.

How much traffic does Murphy Road over Drain Canal carry?

About 520 vehicles per day (2013 count), of which roughly 5% are trucks.

How long is Murphy Road over Drain Canal?

The structure is 23 ft (6.9 m) long with a longest span of 11 ft (3.3 m) and a deck 29 ft wide.

Who owns Murphy Road over Drain Canal?

It is owned by the County Highway Agency.