US Bridges

Road Z over Campbell Slough

Good

Glenn County, California · 1.5 MI N/O SR 162 · Structure no. 11C0266

Built
2011
14 years old
Condition
Good
inspected February 2022
Type
Slab
Concrete Continuous
Length
150 ft
4 main spans
Daily traffic
586
2011 count
Owner
County
County Highway Agency

About this bridge

Road Z over Campbell Slough is a concrete continuous slab carrying Road Z over Campbell Slough in Glenn 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 586 vehicles a day, roughly 10% of them trucks, projected to reach 682 by 2044. The structure is 150 ft (45.7 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesRoad Z
CrossesCampbell Slough
Location1.5 MI N/O SR 162
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.48571, -121.9298
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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic586 (2011)
Projected traffic682 by 2044
Trucks10%
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 Road Z over Campbell Slough built?

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

What condition is Road Z over Campbell 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 February 2022.

How much traffic does Road Z over Campbell Slough carry?

About 586 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Road Z over Campbell Slough?

The structure is 150 ft (45.7 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns Road Z over Campbell Slough?

It is owned by the County Highway Agency.