US Bridges

Johnstonville RD over Lassen Creek

Fair

Lassen County, California · 0.1 MI NW of US 395 · Structure no. 07C0028

Built
1924
101 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
600
1980 count
Owner
County
County Highway Agency

About this bridge

Johnstonville RD over Lassen Creek is a concrete continuous slab carrying Johnstonville RD over Lassen Creek in Lassen County, California. It was built in 1924, so it is 101 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 600 vehicles a day, roughly 10% of them trucks, projected to reach 981 by 2041. The structure is 31 ft (9.4 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesJohnstonville RD
CrossesLassen Creek
Location0.1 MI NW of US 395
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.38516, -120.58708
Functional classRural Minor Collector

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.
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 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (1980)
Projected traffic981 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Johnstonville RD over Lassen Creek built?

It was built in 1924, making it 101 years old in 2025.

What condition is Johnstonville RD over Lassen 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 August 2023.

How much traffic does Johnstonville RD over Lassen Creek carry?

About 600 vehicles per day (1980 count), of which roughly 10% are trucks.

How long is Johnstonville RD over Lassen Creek?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m) and a deck 27 ft wide.

Who owns Johnstonville RD over Lassen Creek?

It is owned by the County Highway Agency.