US Bridges

Knighton Road over Clover Creek

Fair

Shasta County, California · 1.5 MI E of I5 · Structure no. 06C0358

Built
2002
23 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
242 ft
8 main spans
Daily traffic
4,900
2012 count
Owner
County
County Highway Agency

About this bridge

Knighton Road over Clover Creek is a concrete continuous slab carrying Knighton Road over Clover Creek in Shasta County, California. It was built in 2002, so it is 23 years old, younger 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 4,900 vehicles a day, roughly 5% of them trucks, projected to reach 6,827 by 2043. The structure is 242 ft (73.9 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesKnighton Road
CrossesClover Creek
Location1.5 MI E of I5
RouteCounty Highway 0
CountyShasta County
StateCalifornia
Coordinates40.50551, -122.30886
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length242 ft (73.9 m)
Longest span32 ft (9.8 m)
Deck width49 ft (14.8 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,900 (2012)
Projected traffic6,827 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Knighton Road over Clover Creek built?

It was built in 2002, making it 23 years old in 2025.

What condition is Knighton Road over Clover Creek 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 May 2023.

How much traffic does Knighton Road over Clover Creek carry?

About 4,900 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is Knighton Road over Clover Creek?

The structure is 242 ft (73.9 m) long with a longest span of 32 ft (9.8 m) and a deck 49 ft wide.

Who owns Knighton Road over Clover Creek?

It is owned by the County Highway Agency.