US Bridges

Knighton Road over Interstate 5

Good

Shasta County, California · 02-SHA-005-R9.77 · Structure no. 06 0134

Built
1965
60 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
259 ft
4 main spans
Daily traffic
7,500
2014 count
Owner
State
State Highway Agency

About this bridge

Knighton Road over Interstate 5 is a concrete continuous box beam or girders - multiple carrying Knighton Road over Interstate 5 in Shasta County, California. It was built in 1965, so it is 60 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 7,500 vehicles a day, roughly 2% of them trucks, projected to reach 10,543 by 2045. The structure is 259 ft (78.9 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesKnighton Road
CrossesInterstate 5
Location02-SHA-005-R9.77
RouteCounty Highway 0
Coordinates40.50549, -122.33848
Functional classUrban Local

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.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length259 ft (78.9 m)
Longest span88 ft (26.9 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,500 (2014)
Projected traffic10,543 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 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 Knighton Road over Interstate 5 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Knighton Road over Interstate 5 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 June 2024.

How much traffic does Knighton Road over Interstate 5 carry?

About 7,500 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Knighton Road over Interstate 5?

The structure is 259 ft (78.9 m) long with a longest span of 88 ft (26.9 m) and a deck 40 ft wide.

Who owns Knighton Road over Interstate 5?

It is owned by the State Highway Agency.