US Bridges

Middle Bar RD over Mokelumne River

FairPosted for load

Calaveras County, California · 3.0 MI S of RTE 49 · Structure no. 30C0016

Built
1912
113 years old
Condition
Fair
inspected February 2025
Type
Truss - Thru
Steel
Length
208 ft
1 main span
Daily traffic
23
2008 count
Owner
County
County Highway Agency

About this bridge

Middle Bar RD over Mokelumne River is a steel truss - thru carrying Middle Bar RD over Mokelumne River in Calaveras County, California. It was built in 1912, so it is 113 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. Its operating status is: posted for load restriction.

It carries about 23 vehicles a day, projected to reach 57 by 2043. The structure is 208 ft (63.3 m) long and 20 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesMiddle Bar RD
CrossesMokelumne River
Location3.0 MI S of RTE 49
RouteCounty Highway 0
CountyCalaveras County
StateCalifornia
Coordinates38.29735, -120.74976
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating13.2 US tons
Inventory rating7.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length208 ft (63.3 m)
Longest span204 ft (62.3 m)
Deck width20 ft (6.1 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck17 ft (5 m)

Traffic and service

Average daily traffic23 (2008)
Projected traffic57 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Middle Bar RD over Mokelumne River built?

It was built in 1912, making it 113 years old in 2025.

What condition is Middle Bar RD over Mokelumne River 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 Middle Bar RD over Mokelumne River carry?

About 23 vehicles per day (2008 count).

How long is Middle Bar RD over Mokelumne River?

The structure is 208 ft (63.3 m) long with a longest span of 204 ft (62.3 m) and a deck 20 ft wide.

Who owns Middle Bar RD over Mokelumne River?

It is owned by the County Highway Agency.