US Bridges

State Route 18 over Arctic Canyon Wash

Fair

San Bernardino County, California · 08-SBD-018-68.45 · Structure no. 54 0569

Built
1958
67 years old
Condition
Fair
inspected November 2022
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
4,400
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 18 over Arctic Canyon Wash is a concrete culvert carrying State Route 18 over Arctic Canyon Wash in San Bernardino County, California. It was built in 1958, so it is 67 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 4,400 vehicles a day, roughly 5% of them trucks, projected to reach 5,000 by 2040. The structure is 33 ft (10.1 m) long and 48 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 18
CrossesArctic Canyon Wash
Location08-SBD-018-68.45
RouteState Highway 18
Coordinates34.38775, -116.87947
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span10 ft (3 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,400 (2020)
Projected traffic5,000 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 18 over Arctic Canyon Wash built?

It was built in 1958, making it 67 years old in 2025.

What condition is State Route 18 over Arctic Canyon Wash 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 November 2022.

How much traffic does State Route 18 over Arctic Canyon Wash carry?

About 4,400 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is State Route 18 over Arctic Canyon Wash?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 48 ft wide.

Who owns State Route 18 over Arctic Canyon Wash?

It is owned by the State Highway Agency.