US Bridges

Conservation Ctr R over Brockman Slough

Good

Lassen County, California · 7.5 MI E of SR 36 · Structure no. 07C0030

Built
1969
56 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
1,200
1980 count
Owner
County
County Highway Agency

About this bridge

Conservation Ctr R over Brockman Slough is a concrete continuous slab carrying Conservation Ctr R over Brockman Slough in Lassen County, California. It was built in 1969, so it is 56 years old, older 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 1,200 vehicles a day, roughly 10% of them trucks, projected to reach 1,963 by 2041. The structure is 77 ft (23.5 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesConservation Ctr R
CrossesBrockman Slough
Location7.5 MI E of SR 36
RouteCounty Highway 0
Coordinates40.39644, -120.58622
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (1980)
Projected traffic1,963 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Conservation Ctr R over Brockman Slough built?

It was built in 1969, making it 56 years old in 2025.

What condition is Conservation Ctr R over Brockman Slough 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 Conservation Ctr R over Brockman Slough carry?

About 1,200 vehicles per day (1980 count), of which roughly 10% are trucks.

How long is Conservation Ctr R over Brockman Slough?

The structure is 77 ft (23.5 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Conservation Ctr R over Brockman Slough?

It is owned by the County Highway Agency.