US Bridges

County RD 306 over Dry Creek

Fair

Glenn County, California · 1.58 MI N Colusa CO Line · Structure no. 11C0031

Built
1951
74 years old, rebuilt 1983
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
150
2009 count
Owner
County
County Highway Agency

About this bridge

County RD 306 over Dry Creek is a concrete continuous culvert carrying County RD 306 over Dry Creek in Glenn County, California. It was built in 1951 and reconstructed in 1983, 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 6 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 150 vehicles a day, roughly 15% of them trucks, projected to reach 220 by 2043. The structure is 51 ft (15.5 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty RD 306
CrossesDry Creek
Location1.58 MI N Colusa CO Line
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.40671, -122.54926
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span17 ft (5.1 m)
Deck width35 ft (10.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2009)
Projected traffic220 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Dry Creek built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1983.

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

About 150 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is County RD 306 over Dry Creek?

The structure is 51 ft (15.5 m) long with a longest span of 17 ft (5.1 m) and a deck 35 ft wide.

Who owns County RD 306 over Dry Creek?

It is owned by the County Highway Agency.