US Bridges

Dirks Road over Dirks Creek

Fair

Colusa County, California · 1.3 MI S of Glen CO Line · Structure no. 15C0160

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
114
2003 count
Owner
County
County Highway Agency

About this bridge

Dirks Road over Dirks Creek is a concrete slab carrying Dirks Road over Dirks Creek in Colusa County, California. It was built in 1960, so it is 65 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 114 vehicles a day, roughly 10% of them trucks, projected to reach 193 by 2045. The structure is 33 ft (10 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesDirks Road
CrossesDirks Creek
Location1.3 MI S of Glen CO Line
RouteCounty Highway 0
Coordinates39.36525, -122.24806
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10 m)
Longest span31 ft (9.6 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic114 (2003)
Projected traffic193 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dirks Road over Dirks Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Dirks Road over Dirks 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 July 2023.

How much traffic does Dirks Road over Dirks Creek carry?

About 114 vehicles per day (2003 count), of which roughly 10% are trucks.

How long is Dirks Road over Dirks Creek?

The structure is 33 ft (10 m) long with a longest span of 31 ft (9.6 m) and a deck 29 ft wide.

Who owns Dirks Road over Dirks Creek?

It is owned by the County Highway Agency.