US Bridges

Interstate 5 & RR over Shasta Lake

Fair

Shasta County, California · 02-SHA-005-R28.14 · Structure no. 06 0021

Built
1941
84 years old, rebuilt 2008
Condition
Fair
inspected June 2023
Type
Truss - Deck
Steel
Length
3,588 ft
8 main spans
Daily traffic
19,500
2009 count
Owner
Federal
Bureau of Reclamation

About this bridge

Interstate 5 & RR over Shasta Lake is a steel truss - deck carrying Interstate 5 & RR over Shasta Lake in Shasta County, California. It was built in 1941 and reconstructed in 2008, so it is 84 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 19,500 vehicles a day, roughly 29% of them trucks, projected to reach 37,258 by 2034. The structure is 3,588 ft (1,093.6 m) long and 62 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

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CarriesInterstate 5 & RR
CrossesShasta Lake
Location02-SHA-005-R28.14
RouteInterstate 5
CountyShasta County
StateCalifornia
Coordinates40.76166, -122.31861
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64 US tons
Inventory rating47 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans8 (+7 approach)
Design loadH 20
Structure length3,588 ft (1,093.6 m)
Longest span630 ft (192 m)
Deck width62 ft (18.9 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,500 (2009)
Projected traffic37,258 by 2034
Trucks29%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerBureau of Reclamation
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Interstate 5 & RR over Shasta Lake built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2008.

What condition is Interstate 5 & RR over Shasta Lake 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 June 2023.

How much traffic does Interstate 5 & RR over Shasta Lake carry?

About 19,500 vehicles per day (2009 count), of which roughly 29% are trucks.

How long is Interstate 5 & RR over Shasta Lake?

The structure is 3,588 ft (1,093.6 m) long with a longest span of 630 ft (192 m) and a deck 62 ft wide.

Who owns Interstate 5 & RR over Shasta Lake?

It is owned by the Bureau of Reclamation and maintained by the State Highway Agency.