US Bridges

State Route 18 over Hillside

Fair

San Bernardino County, California · 08-SBD-018-R17.81 · Structure no. 54 0686

Built
1965
60 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
302 ft
4 main spans
Daily traffic
8,600
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 18 over Hillside is a steel stringer/multi-beam or girder carrying State Route 18 over Hillside in San Bernardino County, California. It was built in 1965, so it is 60 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 8,600 vehicles a day, roughly 13% of them trucks, projected to reach 10,000 by 2043. The structure is 302 ft (92 m) long and 50 ft wide. If it were closed, the detour would be 47.2 mi (76 km).

Location

Open in Google Maps
CarriesState Route 18
CrossesHillside
Location08-SBD-018-R17.81
RouteState Highway 18
CountySan Bernardino County
StateCalifornia
Coordinates34.22796, -117.2888
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating77.8 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length302 ft (92 m)
Longest span90 ft (27.4 m)
Deck width50 ft (15.2 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2017)
Projected traffic10,000 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed47.2 mi (76 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 Hillside built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 18 over Hillside 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 October 2024.

How much traffic does State Route 18 over Hillside carry?

About 8,600 vehicles per day (2017 count), of which roughly 13% are trucks.

How long is State Route 18 over Hillside?

The structure is 302 ft (92 m) long with a longest span of 90 ft (27.4 m) and a deck 50 ft wide.

Who owns State Route 18 over Hillside?

It is owned by the State Highway Agency.