US Bridges

County RD 306 over Branch Stony Creek

Fair

Glenn County, California · 1 MI N of RD #303 · Structure no. 11C0155

Built
1930
95 years old, rebuilt 1970
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
23 ft
1 main span
Daily traffic
235
2009 count
Owner
County
County Highway Agency

About this bridge

County RD 306 over Branch Stony Creek is a concrete tee beam carrying County RD 306 over Branch Stony Creek in Glenn County, California. It was built in 1930 and reconstructed in 1970, so it is 95 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 235 vehicles a day, roughly 15% of them trucks, projected to reach 310 by 2043. The structure is 23 ft (7 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCounty RD 306
CrossesBranch Stony Creek
Location1 MI N of RD #303
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.44915, -122.51356
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic235 (2009)
Projected traffic310 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 RD 306 over Branch Stony Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1970.

What condition is County RD 306 over Branch Stony Creek 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 August 2023.

How much traffic does County RD 306 over Branch Stony Creek carry?

About 235 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is County RD 306 over Branch Stony Creek?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns County RD 306 over Branch Stony Creek?

It is owned by the County Highway Agency.