US Bridges

Lower Sacramento R over Mokelumne River

Good

San Joaquin County, California · 0.9 MI N Turner RD · Structure no. 29C0138

Built
1969
56 years old
Condition
Good
inspected January 2022
Type
Tee Beam
Concrete Continuous
Length
182 ft
3 main spans
Daily traffic
9,943
2008 count
Owner
County
County Highway Agency

About this bridge

Lower Sacramento R over Mokelumne River is a concrete continuous tee beam carrying Lower Sacramento R over Mokelumne River in San Joaquin County, California. It was built in 1969, so it is 56 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 9,943 vehicles a day, roughly 10% of them trucks, projected to reach 18,577 by 2044. The structure is 182 ft (55.6 m) long and 40 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesLower Sacramento R
CrossesMokelumne River
Location0.9 MI N Turner RD
RouteCounty Highway 0
Coordinates38.15707, -121.29824
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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2022
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 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 rating57.9 US tons
Inventory rating44.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length182 ft (55.6 m)
Longest span60 ft (18.3 m)
Deck width40 ft (12.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,943 (2008)
Projected traffic18,577 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 Lower Sacramento R over Mokelumne River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Lower Sacramento R over Mokelumne 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 January 2022.

How much traffic does Lower Sacramento R over Mokelumne River carry?

About 9,943 vehicles per day (2008 count), of which roughly 10% are trucks.

How long is Lower Sacramento R over Mokelumne River?

The structure is 182 ft (55.6 m) long with a longest span of 60 ft (18.3 m) and a deck 40 ft wide.

Who owns Lower Sacramento R over Mokelumne River?

It is owned by the County Highway Agency.