US Bridges

C.R. 203 over Lassen Creek

Fair

Lassen County, California · 6.8 MI SE of SR 36 · Structure no. 07C0039

Built
1967
58 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
41 ft
1 main span
Daily traffic
600
1980 count
Owner
County
County Highway Agency

About this bridge

C.R. 203 over Lassen Creek is a concrete tee beam carrying C.R. 203 over Lassen Creek in Lassen County, California. It was built in 1967, so it is 58 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 7% of them trucks, projected to reach 1,963 by 2041. The structure is 41 ft (12.5 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesC.R. 203
CrossesLassen Creek
Location6.8 MI SE of SR 36
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.37602, -120.60655
Functional classRural Major 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
Deck7 GoodSome minor problems.
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 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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.7 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (1980)
Projected traffic1,963 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 C.R. 203 over Lassen Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is C.R. 203 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 C.R. 203 over Lassen Creek carry?

About 600 vehicles per day (1980 count), of which roughly 7% are trucks.

How long is C.R. 203 over Lassen Creek?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.7 m) and a deck 32 ft wide.

Who owns C.R. 203 over Lassen Creek?

It is owned by the County Highway Agency.