US Bridges

State Route 99 over Line Canal

Fair

Butte County, California · 03-BUT-099-0.01 · Structure no. 12 0102

Built
1917
108 years old, rebuilt 1950
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
15,300
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over Line Canal is a concrete continuous culvert carrying State Route 99 over Line Canal in Butte County, California. It was built in 1917 and reconstructed in 1950, so it is 108 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 6 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 15,300 vehicles a day, roughly 7% of them trucks, projected to reach 27,475 by 2041. The structure is 21 ft (6.4 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesState Route 99
CrossesLine Canal
Location03-BUT-099-0.01
RouteState Highway 99
CountyButte County
StateCalifornia
Coordinates39.3051, -121.67256
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,300 (2020)
Projected traffic27,475 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 99 over Line Canal built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 1950.

What condition is State Route 99 over Line 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 April 2023.

How much traffic does State Route 99 over Line Canal carry?

About 15,300 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is State Route 99 over Line Canal?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 44 ft wide.

Who owns State Route 99 over Line Canal?

It is owned by the State Highway Agency.