US Bridges

Lassen Lane over Interstate 5

Fair

Siskiyou County, California · 02-SIS-005-R11.17-MSHA · Structure no. 02 0067

Built
1964
61 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
206 ft
4 main spans
Daily traffic
2,650
2024 count
Owner
State
State Highway Agency

About this bridge

Lassen Lane over Interstate 5 is a concrete continuous tee beam carrying Lassen Lane over Interstate 5 in Siskiyou County, California. It was built in 1964, so it is 61 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 2,650 vehicles a day, roughly 2% of them trucks, projected to reach 3,685 by 2045. The structure is 206 ft (62.8 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesLassen Lane
CrossesInterstate 5
Location02-SIS-005-R11.17-MSHA
RouteCity Street 0
CountySiskiyou County
StateCalifornia
Coordinates41.31926, -122.32555
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length206 ft (62.8 m)
Longest span70 ft (21.3 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,650 (2024)
Projected traffic3,685 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lassen Lane over Interstate 5 built?

It was built in 1964, making it 61 years old in 2025.

What condition is Lassen Lane over Interstate 5 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 July 2024.

How much traffic does Lassen Lane over Interstate 5 carry?

About 2,650 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Lassen Lane over Interstate 5?

The structure is 206 ft (62.8 m) long with a longest span of 70 ft (21.3 m) and a deck 40 ft wide.

Who owns Lassen Lane over Interstate 5?

It is owned by the State Highway Agency.