US Bridges

Delphos Road over Lurline Creek

Fair

Colusa County, California · 0.5 MI S/O Lurline Ave · Structure no. 15C0040

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
72 ft
3 main spans
Daily traffic
22
2014 count
Owner
County
County Highway Agency

About this bridge

Delphos Road over Lurline Creek is a concrete continuous slab carrying Delphos Road over Lurline Creek in Colusa County, California. It was built in 1971, so it is 54 years old, younger 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 22 vehicles a day, roughly 10% of them trucks, projected to reach 52 by 2043. The structure is 72 ft (21.9 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesDelphos Road
CrossesLurline Creek
Location0.5 MI S/O Lurline Ave
RouteCounty Highway 0
CountyColusa County
StateCalifornia
Coordinates39.21226, -122.18021
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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length72 ft (21.9 m)
Longest span28 ft (8.5 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22 (2014)
Projected traffic52 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Delphos Road over Lurline Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Delphos Road over Lurline 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 Delphos Road over Lurline Creek carry?

About 22 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Delphos Road over Lurline Creek?

The structure is 72 ft (21.9 m) long with a longest span of 28 ft (8.5 m) and a deck 33 ft wide.

Who owns Delphos Road over Lurline Creek?

It is owned by the County Highway Agency.