US Bridges

Main ST over San Andreas Creek

Fair

Calaveras County, California · In San Andreas · Structure no. 30C0026

Built
1914
111 years old
Condition
Fair
inspected February 2025
Type
Arch - Deck
Concrete
Length
30 ft
1 main span
Daily traffic
1,443
2014 count
Owner
County
County Highway Agency

About this bridge

Main ST over San Andreas Creek is a concrete arch - deck carrying Main ST over San Andreas Creek in Calaveras County, California. It was built in 1914, so it is 111 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 5 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 1,443 vehicles a day, roughly 1% of them trucks, projected to reach 1,502 by 2047. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesMain ST
CrossesSan Andreas Creek
LocationIn San Andreas
RouteCounty Highway 0
Coordinates38.19781, -120.68026
Functional classRural Minor 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating18.5 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span20 ft (6.1 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,443 (2014)
Projected traffic1,502 by 2047
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Main ST over San Andreas Creek built?

It was built in 1914, making it 111 years old in 2025.

What condition is Main ST over San Andreas Creek 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 February 2025.

How much traffic does Main ST over San Andreas Creek carry?

About 1,443 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is Main ST over San Andreas Creek?

The structure is 30 ft (9.1 m) long with a longest span of 20 ft (6.1 m) and a deck 24 ft wide.

Who owns Main ST over San Andreas Creek?

It is owned by the County Highway Agency.