US Bridges

CR316 (mcclelland) over North Fork Dill Slough

Fair

Lassen County, California · 0.2 MI N of CR 304 · Structure no. 07C0075

Built
1978
47 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
2 main spans
Daily traffic
50
1979 count
Owner
County
County Highway Agency

About this bridge

CR316 (mcclelland) over North Fork Dill Slough is a wood or timber stringer/multi-beam or girder carrying CR316 (mcclelland) over North Fork Dill Slough in Lassen County, California. It was built in 1978, so it is 47 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 50 vehicles a day, roughly 1% of them trucks, projected to reach 56 by 2046. The structure is 31 ft (9.5 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCR316 (mcclelland)
CrossesNorth Fork Dill Slough
Location0.2 MI N of CR 304
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.35321, -120.36804
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length31 ft (9.5 m)
Longest span15 ft (4.5 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1979)
Projected traffic56 by 2046
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 CR316 (mcclelland) over North Fork Dill Slough built?

It was built in 1978, making it 47 years old in 2025.

What condition is CR316 (mcclelland) over North Fork Dill 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 CR316 (mcclelland) over North Fork Dill Slough carry?

About 50 vehicles per day (1979 count), of which roughly 1% are trucks.

How long is CR316 (mcclelland) over North Fork Dill Slough?

The structure is 31 ft (9.5 m) long with a longest span of 15 ft (4.5 m) and a deck 20 ft wide.

Who owns CR316 (mcclelland) over North Fork Dill Slough?

It is owned by the County Highway Agency.