US Bridges

State Route 65 over Best Slough

Good

Yuba County, California · 03-YUB-065-3.55 · Structure no. 16 0003

Built
1915
110 years old, rebuilt 1975
Condition
Good
inspected September 2023
Type
Tee Beam
Concrete
Length
126 ft
6 main spans
Daily traffic
25,000
2010 count
Owner
State
State Highway Agency

About this bridge

State Route 65 over Best Slough is a concrete tee beam carrying State Route 65 over Best Slough in Yuba County, California. It was built in 1915 and reconstructed in 1975, so it is 110 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 25,000 vehicles a day, roughly 5% of them trucks, projected to reach 39,551 by 2041. The structure is 126 ft (38.3 m) long and 44 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesState Route 65
CrossesBest Slough
Location03-YUB-065-3.55
RouteState Highway 65
CountyYuba County
StateCalifornia
Coordinates39.03542, -121.46386
Functional classRural Principal Arterial - Interstate

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating46.7 US tons
Inventory rating28.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length126 ft (38.3 m)
Longest span20 ft (6.1 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,000 (2010)
Projected traffic39,551 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 65 over Best Slough built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1975.

What condition is State Route 65 over Best Slough 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 September 2023.

How much traffic does State Route 65 over Best Slough carry?

About 25,000 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is State Route 65 over Best Slough?

The structure is 126 ft (38.3 m) long with a longest span of 20 ft (6.1 m) and a deck 44 ft wide.

Who owns State Route 65 over Best Slough?

It is owned by the State Highway Agency.