US Bridges

Eight Mile RD over Calaveras River

Good

San Joaquin County, California · 1.4 MI West of SH 88 · Structure no. 29C0147

Built
1963
62 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete Continuous
Length
86 ft
3 main spans
Daily traffic
4,504
2013 count
Owner
County
County Highway Agency

About this bridge

Eight Mile RD over Calaveras River is a concrete continuous slab carrying Eight Mile RD over Calaveras River in San Joaquin County, California. It was built in 1963, so it is 62 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 4,504 vehicles a day, roughly 10% of them trucks, projected to reach 6,557 by 2041. The structure is 86 ft (26.2 m) long and 41 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesEight Mile RD
CrossesCalaveras River
Location1.4 MI West of SH 88
RouteCounty Highway 0
Coordinates38.05816, -121.16452
Functional classRural Major 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length86 ft (26.2 m)
Longest span28 ft (8.5 m)
Deck width41 ft (12.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,504 (2013)
Projected traffic6,557 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Calaveras River built?

It was built in 1963, making it 62 years old in 2025.

What condition is Eight Mile RD over Calaveras River 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 February 2023.

How much traffic does Eight Mile RD over Calaveras River carry?

About 4,504 vehicles per day (2013 count), of which roughly 10% are trucks.

How long is Eight Mile RD over Calaveras River?

The structure is 86 ft (26.2 m) long with a longest span of 28 ft (8.5 m) and a deck 41 ft wide.

Who owns Eight Mile RD over Calaveras River?

It is owned by the County Highway Agency.