US Bridges

Mcdermott Road over Dirks Creek

Fair

Colusa County, California · 1.5 MI N of Delevan RD · Structure no. 15C0122

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
40 ft
3 main spans
Daily traffic
31
2014 count
Owner
County
County Highway Agency

About this bridge

Mcdermott Road over Dirks Creek is a steel continuous stringer/multi-beam or girder carrying Mcdermott 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 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 31 vehicles a day, roughly 10% of them trucks, projected to reach 109 by 2041. The structure is 40 ft (12.3 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMcdermott Road
CrossesDirks Creek
Location1.5 MI N of Delevan RD
RouteCounty Highway 0
CountyColusa County
StateCalifornia
Coordinates39.36974, -122.22961
Functional classRural Minor 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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length40 ft (12.3 m)
Longest span31 ft (9.3 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31 (2014)
Projected traffic109 by 2041
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 Mcdermott Road over Dirks Creek built?

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

What condition is Mcdermott 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 Mcdermott Road over Dirks Creek carry?

About 31 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Mcdermott Road over Dirks Creek?

The structure is 40 ft (12.3 m) long with a longest span of 31 ft (9.3 m) and a deck 29 ft wide.

Who owns Mcdermott Road over Dirks Creek?

It is owned by the County Highway Agency.