US Bridges

Thornton Road over Mosher Slough

Good

San Joaquin County, California · S Davis RD in Tx · Structure no. 29C0052

Built
1931
94 years old, rebuilt 1970
Condition
Good
inspected January 2024
Type
Slab
Concrete Continuous
Length
54 ft
3 main spans
Daily traffic
26,616
2013 count
Owner
County
County Highway Agency

About this bridge

Thornton Road over Mosher Slough is a concrete continuous slab carrying Thornton Road over Mosher Slough in San Joaquin County, California. It was built in 1931 and reconstructed in 1970, so it is 94 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 26,616 vehicles a day, roughly 2% of them trucks, projected to reach 25,607 by 2042. The structure is 54 ft (16.5 m) long and 107 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesThornton Road
CrossesMosher Slough
LocationS Davis RD in Tx
RouteCounty Highway 0
Coordinates38.02822, -121.33149
Functional classUrban Other Principal Arterial

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 2024
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior 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 spans3
Design loadUnknown
Structure length54 ft (16.5 m)
Longest span17 ft (5.3 m)
Deck width107 ft (32.5 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,616 (2013)
Projected traffic25,607 by 2042
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Thornton Road over Mosher Slough built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1970.

What condition is Thornton Road over Mosher Slough 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 2024.

How much traffic does Thornton Road over Mosher Slough carry?

About 26,616 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Thornton Road over Mosher Slough?

The structure is 54 ft (16.5 m) long with a longest span of 17 ft (5.3 m) and a deck 107 ft wide.

Who owns Thornton Road over Mosher Slough?

It is owned by the County Highway Agency.