US Bridges

Lower Sacto RD over Mosher Slough

Poor

San Joaquin County, California · N. of Macduff Ave · Structure no. 29C0134

Built
1972
53 years old
Condition
Poor
inspected December 2023
Type
Slab
Concrete Continuous
Length
66 ft
2 main spans
Daily traffic
19,600
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lower Sacto RD over Mosher Slough is a concrete continuous slab carrying Lower Sacto RD over Mosher Slough in San Joaquin County, California. It was built in 1972, so it is 53 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 19,600 vehicles a day, roughly 7% of them trucks, projected to reach 19,367 by 2045. The structure is 66 ft (20.1 m) long and 106 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLower Sacto RD
CrossesMosher Slough
LocationN. of Macduff Ave
RouteCity Street 0
Coordinates38.02812, -121.32257
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span32 ft (9.8 m)
Deck width106 ft (32.3 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,600 (2015)
Projected traffic19,367 by 2045
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Sacto RD over Mosher Slough built?

It was built in 1972, making it 53 years old in 2025.

What condition is Lower Sacto RD over Mosher Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does Lower Sacto RD over Mosher Slough carry?

About 19,600 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is Lower Sacto RD over Mosher Slough?

The structure is 66 ft (20.1 m) long with a longest span of 32 ft (9.8 m) and a deck 106 ft wide.

Who owns Lower Sacto RD over Mosher Slough?

It is owned by the City or Municipal Highway Agency.