US Bridges

Larkin RD over Main Drainage Canal

Fair

Butte County, California · 3.91 MI N/E from SH 99 · Structure no. 12C0252

Built
1938
87 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
58 ft
3 main spans
Daily traffic
2,308
2019 count
Owner
County
County Highway Agency

About this bridge

Larkin RD over Main Drainage Canal is a steel continuous stringer/multi-beam or girder carrying Larkin RD over Main Drainage Canal in Butte County, California. It was built in 1938, 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,308 vehicles a day, roughly 7% of them trucks, projected to reach 4,177 by 2044. The structure is 58 ft (17.7 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesLarkin RD
CrossesMain Drainage Canal
Location3.91 MI N/E from SH 99
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.44773, -121.65574
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,308 (2019)
Projected traffic4,177 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Larkin RD over Main Drainage Canal built?

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

What condition is Larkin RD over Main Drainage Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does Larkin RD over Main Drainage Canal carry?

About 2,308 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Larkin RD over Main Drainage Canal?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 30 ft wide.

Who owns Larkin RD over Main Drainage Canal?

It is owned by the County Highway Agency.