US Bridges

Jack Tone RD over Mormon Slough

Fair

San Joaquin County, California · 0.4 MI S Copperopolis RD · Structure no. 29C0163

Built
1960
65 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
137 ft
5 main spans
Daily traffic
3,577
2013 count
Owner
County
County Highway Agency

About this bridge

Jack Tone RD over Mormon Slough is a concrete continuous slab carrying Jack Tone RD over Mormon Slough in San Joaquin County, California. It was built in 1960, so it is 65 years old, older 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 3,577 vehicles a day, roughly 16% of them trucks, projected to reach 4,590 by 2041. The structure is 137 ft (41.9 m) long and 32 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesJack Tone RD
CrossesMormon Slough
Location0.4 MI S Copperopolis RD
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates37.96469, -121.1485
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length137 ft (41.9 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,577 (2013)
Projected traffic4,590 by 2041
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Jack Tone RD over Mormon Slough built?

It was built in 1960, making it 65 years old in 2025.

What condition is Jack Tone RD over Mormon Slough 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 Jack Tone RD over Mormon Slough carry?

About 3,577 vehicles per day (2013 count), of which roughly 16% are trucks.

How long is Jack Tone RD over Mormon Slough?

The structure is 137 ft (41.9 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Jack Tone RD over Mormon Slough?

It is owned by the County Highway Agency.