US Bridges

Herlong Access RD over Long Valley Creek

Good

Lassen County, California · 2.2 MI E US HWY 395 · Structure no. 07C0007

Built
1979
46 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
253 ft
10 main spans
Daily traffic
800
1980 count
Owner
County
County Highway Agency

About this bridge

Herlong Access RD over Long Valley Creek is a concrete continuous slab carrying Herlong Access RD over Long Valley Creek in Lassen County, California. It was built in 1979, so it is 46 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 800 vehicles a day, roughly 7% of them trucks, projected to reach 1,008 by 2043. The structure is 253 ft (77 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesHerlong Access RD
CrossesLong Valley Creek
Location2.2 MI E US HWY 395
RouteCounty Highway 0
Coordinates40.13553, -120.20964
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length253 ft (77 m)
Longest span25 ft (7.6 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (1980)
Projected traffic1,008 by 2043
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 Herlong Access RD over Long Valley Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Herlong Access RD over Long Valley Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Herlong Access RD over Long Valley Creek carry?

About 800 vehicles per day (1980 count), of which roughly 7% are trucks.

How long is Herlong Access RD over Long Valley Creek?

The structure is 253 ft (77 m) long with a longest span of 25 ft (7.6 m) and a deck 31 ft wide.

Who owns Herlong Access RD over Long Valley Creek?

It is owned by the County Highway Agency.