US Bridges

Lassen Park Road over West Fork Sulphur Creek

Fair

Shasta County, California · 2 Miles North of South En · Structure no. 8400001P0000000

Built
1964
61 years old, rebuilt 1975
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
214 ft
2 main spans
Daily traffic
300
2019 count
Owner
Federal
National Park Service

About this bridge

Lassen Park Road over West Fork Sulphur Creek is a steel continuous stringer/multi-beam or girder carrying Lassen Park Road over West Fork Sulphur Creek in Shasta County, California. It was built in 1964 and reconstructed in 1975, so it is 61 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 6 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 300 vehicles a day, roughly 6% of them trucks, projected to reach 360 by 2039. The structure is 214 ft (65.2 m) long and 33 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

Location

Open in Google Maps
CarriesLassen Park Road
CrossesWest Fork Sulphur Creek
Location2 Miles North of South En
RouteFederal Lands Road 10
CountyShasta County
StateCalifornia
Coordinates40.44781, -121.53631
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating68 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length214 ft (65.2 m)
Longest span105 ft (32 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2019)
Projected traffic360 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed70.8 mi (114 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$35,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lassen Park Road over West Fork Sulphur Creek built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1975.

What condition is Lassen Park Road over West Fork Sulphur 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 July 2024.

How much traffic does Lassen Park Road over West Fork Sulphur Creek carry?

About 300 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Lassen Park Road over West Fork Sulphur Creek?

The structure is 214 ft (65.2 m) long with a longest span of 105 ft (32 m) and a deck 33 ft wide.

Who owns Lassen Park Road over West Fork Sulphur Creek?

It is owned by the National Park Service.