US Bridges

Interstate 15 NB over Telephone Wash

Fair

San Bernardino County, California · 08-SBD-015-R110.36 · Structure no. 54 0233R

Built
1964
61 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
60 ft
3 main spans
Daily traffic
22,000
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 NB over Telephone Wash is a concrete channel beam carrying Interstate 15 NB over Telephone Wash in San Bernardino County, California. It was built in 1964, so it is 61 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 22,000 vehicles a day, roughly 20% of them trucks, projected to reach 26,400 by 2041. The structure is 60 ft (18.3 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 15 NB
CrossesTelephone Wash
Location08-SBD-015-R110.36
RouteInterstate 15
CountySan Bernardino County
StateCalifornia
Coordinates35.05956, -116.42935
Functional classRural Principal Arterial - Interstate

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2019)
Projected traffic26,400 by 2041
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Interstate 15 NB over Telephone Wash built?

It was built in 1964, making it 61 years old in 2025.

What condition is Interstate 15 NB over Telephone 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 October 2023.

How much traffic does Interstate 15 NB over Telephone Wash carry?

About 22,000 vehicles per day (2019 count), of which roughly 20% are trucks.

How long is Interstate 15 NB over Telephone Wash?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 42 ft wide.

Who owns Interstate 15 NB over Telephone Wash?

It is owned by the State Highway Agency.