US Bridges

State Route 18 over Cushenbury Creek

Fair

San Bernardino County, California · 08-SBD-018-66.80 · Structure no. 54 1283

Built
2010
15 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Single or Spread
Concrete
Length
70 ft
1 main span
Daily traffic
5,100
2022 count
Owner
State
State Highway Agency

About this bridge

State Route 18 over Cushenbury Creek is a concrete box beam or girders - single or spread carrying State Route 18 over Cushenbury Creek in San Bernardino County, California. It was built in 2010, so it is 15 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 5,100 vehicles a day, roughly 13% of them trucks, projected to reach 7,000 by 2042. The structure is 70 ft (21.3 m) long and 43 ft wide. If it were closed, the detour would be 74.6 mi (120 km).

Location

Open in Google Maps
CarriesState Route 18
CrossesCushenbury Creek
Location08-SBD-018-66.80
RouteState Highway 18
CountySan Bernardino County
StateCalifornia
Coordinates34.37146, -116.85923
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,100 (2022)
Projected traffic7,000 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed74.6 mi (120 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 18 over Cushenbury Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is State Route 18 over Cushenbury 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 December 2024.

How much traffic does State Route 18 over Cushenbury Creek carry?

About 5,100 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is State Route 18 over Cushenbury Creek?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns State Route 18 over Cushenbury Creek?

It is owned by the State Highway Agency.