US Bridges

Eight Mile RD over Mosher Slough

Fair

San Joaquin County, California · 2.5 MI E of SH 99 · Structure no. 29C0146

Built
1962
63 years old
Condition
Fair
inspected December 2021
Type
Slab
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
5,003
2013 count
Owner
County
County Highway Agency

About this bridge

Eight Mile RD over Mosher Slough is a concrete continuous slab carrying Eight Mile RD over Mosher Slough in San Joaquin County, California. It was built in 1962, so it is 63 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 5,003 vehicles a day, roughly 12% of them trucks, projected to reach 4,191 by 2038. The structure is 77 ft (23.5 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesEight Mile RD
CrossesMosher Slough
Location2.5 MI E of SH 99
RouteCounty Highway 0
CountySan Joaquin County
StateCalifornia
Coordinates38.05769, -121.21562
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionDecember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,003 (2013)
Projected traffic4,191 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Eight Mile RD over Mosher Slough built?

It was built in 1962, making it 63 years old in 2025.

What condition is Eight Mile RD over Mosher 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 December 2021.

How much traffic does Eight Mile RD over Mosher Slough carry?

About 5,003 vehicles per day (2013 count), of which roughly 12% are trucks.

How long is Eight Mile RD over Mosher Slough?

The structure is 77 ft (23.5 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Eight Mile RD over Mosher Slough?

It is owned by the County Highway Agency.