US Bridges

Afton RD over Linwells Drain

Good

Butte County, California · Just W/O Aquas Frias RD · Structure no. 12C0383

Built
1938
87 years old, rebuilt 1966
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
105
2019 count
Owner
County
County Highway Agency

About this bridge

Afton RD over Linwells Drain is a concrete continuous slab carrying Afton RD over Linwells Drain in Butte County, California. It was built in 1938 and reconstructed in 1966, so it is 87 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 105 vehicles a day, roughly 20% of them trucks, projected to reach 147 by 2044. The structure is 23 ft (7 m) long and 35 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesAfton RD
CrossesLinwells Drain
LocationJust W/O Aquas Frias RD
RouteCounty Highway 0
Coordinates39.42038, -121.85746
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
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 geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width35 ft (10.7 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2019)
Projected traffic147 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-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 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 Afton RD over Linwells Drain built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1966.

What condition is Afton RD over Linwells Drain 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 October 2024.

How much traffic does Afton RD over Linwells Drain carry?

About 105 vehicles per day (2019 count), of which roughly 20% are trucks.

How long is Afton RD over Linwells Drain?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m) and a deck 35 ft wide.

Who owns Afton RD over Linwells Drain?

It is owned by the County Highway Agency.