US Bridges

Field Road over Interstate 15

Fair

San Bernardino County, California · 08-SBD-015-R103.63 · Structure no. 54 0640

Built
1963
62 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
247 ft
4 main spans
Daily traffic
28
2019 count
Owner
State
State Highway Agency

About this bridge

Field Road over Interstate 15 is a concrete continuous box beam or girders - multiple carrying Field Road over Interstate 15 in San Bernardino County, California. It was built in 1963, so it is 62 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 28 vehicles a day, roughly 2% of them trucks, projected to reach 46 by 2041. The structure is 247 ft (75.3 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesField Road
CrossesInterstate 15
Location08-SBD-015-R103.63
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates35.0113, -116.53152
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span88 ft (26.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2019)
Projected traffic46 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Field Road over Interstate 15 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Field Road over Interstate 15 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 2023.

How much traffic does Field Road over Interstate 15 carry?

About 28 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Field Road over Interstate 15?

The structure is 247 ft (75.3 m) long with a longest span of 88 ft (26.8 m) and a deck 34 ft wide.

Who owns Field Road over Interstate 15?

It is owned by the State Highway Agency.