US Bridges

RD 302 (lambert) over Hartson Slough Overflow

Good

Lassen County, California · 0.3 MI South of US 395 · Structure no. 07C0097

Built
2011
14 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
60 ft
3 main spans
Daily traffic
100
1979 count
Owner
County
County Highway Agency

About this bridge

RD 302 (lambert) over Hartson Slough Overflow is a concrete continuous slab carrying RD 302 (lambert) over Hartson Slough Overflow in Lassen County, California. It was built in 2011, so it is 14 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 139 by 2046. The structure is 60 ft (18.3 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRD 302 (lambert)
CrossesHartson Slough Overflow
Location0.3 MI South of US 395
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.36199, -120.39924
Functional classRural Minor 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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating55.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1979)
Projected traffic139 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 RD 302 (lambert) over Hartson Slough Overflow built?

It was built in 2011, making it 14 years old in 2025.

What condition is RD 302 (lambert) over Hartson Slough Overflow 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 2024.

How much traffic does RD 302 (lambert) over Hartson Slough Overflow carry?

About 100 vehicles per day (1979 count), of which roughly 10% are trucks.

How long is RD 302 (lambert) over Hartson Slough Overflow?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns RD 302 (lambert) over Hartson Slough Overflow?

It is owned by the County Highway Agency.