US Bridges

County Road Z over Angel Slough

Fair

Glenn County, California · 0.8 MI N of CO RD #67 · Structure no. 11C0084

Built
1950
75 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
71 ft
7 main spans
Daily traffic
176
2009 count
Owner
County
County Highway Agency

About this bridge

County Road Z over Angel Slough is a concrete continuous slab carrying County Road Z over Angel Slough in Glenn County, California. It was built in 1950, so it is 75 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 5 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 176 vehicles a day, roughly 30% of them trucks, projected to reach 260 by 2042. The structure is 71 ft (21.6 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty Road Z
CrossesAngel Slough
Location0.8 MI N of CO RD #67
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.43118, -121.92961
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadUnknown
Structure length71 ft (21.6 m)
Longest span10 ft (3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic176 (2009)
Projected traffic260 by 2042
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 County Road Z over Angel Slough built?

It was built in 1950, making it 75 years old in 2025.

What condition is County Road Z over Angel Slough 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 February 2024.

How much traffic does County Road Z over Angel Slough carry?

About 176 vehicles per day (2009 count), of which roughly 30% are trucks.

How long is County Road Z over Angel Slough?

The structure is 71 ft (21.6 m) long with a longest span of 10 ft (3 m) and a deck 20 ft wide.

Who owns County Road Z over Angel Slough?

It is owned by the County Highway Agency.