US Bridges

County RD 306 over Elk Creek

Fair

Glenn County, California · 17.2 MI N Colusa CO Line · Structure no. 11C0033

Built
1951
74 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
76 ft
3 main spans
Daily traffic
2,000
2009 count
Owner
County
County Highway Agency

About this bridge

County RD 306 over Elk Creek is a concrete continuous slab carrying County RD 306 over Elk Creek in Glenn County, California. It was built in 1951, so it is 74 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 2,000 vehicles a day, roughly 15% of them trucks, projected to reach 3,633 by 2043. The structure is 76 ft (23.2 m) long and 31 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesCounty RD 306
CrossesElk Creek
Location17.2 MI N Colusa CO Line
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.60289, -122.53839
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.
Superstructure7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating65 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span28 ft (8.5 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2009)
Projected traffic3,633 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesWaterway
Detour if closed39.8 mi (64 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 Elk Creek built?

It was built in 1951, making it 74 years old in 2025.

What condition is County RD 306 over Elk 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 Elk Creek carry?

About 2,000 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is County RD 306 over Elk Creek?

The structure is 76 ft (23.2 m) long with a longest span of 28 ft (8.5 m) and a deck 31 ft wide.

Who owns County RD 306 over Elk Creek?

It is owned by the County Highway Agency.