US Bridges

State Route 88 over Mokelumne River

Good

San Joaquin County, California · 10-SJ-088-19.80 · Structure no. 29 0064

Built
1954
71 years old, rebuilt 2000
Condition
Good
inspected March 2021
Type
Tee Beam
Concrete Continuous
Length
257 ft
4 main spans
Daily traffic
15,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 88 over Mokelumne River is a concrete continuous tee beam carrying State Route 88 over Mokelumne River in San Joaquin County, California. It was built in 1954 and reconstructed in 2000, so it is 71 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 15,000 vehicles a day, roughly 9% of them trucks, projected to reach 38,992 by 2043. The structure is 257 ft (78.3 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesState Route 88
CrossesMokelumne River
Location10-SJ-088-19.80
RouteState Highway 88
Coordinates38.20672, -121.06817
Functional classRural Principal Arterial - Other

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 inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length257 ft (78.3 m)
Longest span70 ft (21.3 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2009)
Projected traffic38,992 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 88 over Mokelumne River built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2000.

What condition is State Route 88 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 March 2021.

How much traffic does State Route 88 over Mokelumne River carry?

About 15,000 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is State Route 88 over Mokelumne River?

The structure is 257 ft (78.3 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.

Who owns State Route 88 over Mokelumne River?

It is owned by the State Highway Agency.