US Bridges

CR306 (capezolli) over Whitehead Slough

FairPosted for load

Lassen County, California · 0.3 MI E of Galeppi RD · Structure no. 07C0070

Built
1950
75 years old
Condition
Fair
inspected August 2024
Type
Girder and Floorbeam System
Steel
Length
55 ft
2 main spans
Daily traffic
100
1979 count
Owner
County
County Highway Agency

About this bridge

CR306 (capezolli) over Whitehead Slough is a steel girder and floorbeam system carrying CR306 (capezolli) over Whitehead Slough in Lassen County, California. It was built in 1950, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 134 by 2042. The structure is 55 ft (16.8 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCR306 (capezolli)
CrossesWhitehead Slough
Location0.3 MI E of Galeppi RD
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.33673, -120.36436
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.1 US tons
Inventory rating12.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckClosed grating
Main spans2
Design loadUnknown
Structure length55 ft (16.8 m)
Longest span27 ft (8.3 m)
Deck width20 ft (6 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1979)
Projected traffic134 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 CR306 (capezolli) over Whitehead Slough built?

It was built in 1950, making it 75 years old in 2025.

What condition is CR306 (capezolli) over Whitehead Slough 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 August 2024.

How much traffic does CR306 (capezolli) over Whitehead Slough carry?

About 100 vehicles per day (1979 count), of which roughly 10% are trucks.

How long is CR306 (capezolli) over Whitehead Slough?

The structure is 55 ft (16.8 m) long with a longest span of 27 ft (8.3 m) and a deck 20 ft wide.

Who owns CR306 (capezolli) over Whitehead Slough?

It is owned by the County Highway Agency.