US Bridges

N15-OLD HWY 58-N15 over Interstate 15

Fair

San Bernardino County, California · 08-SBD-015-76.80 · Structure no. 54 0550E

Built
1961
64 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
265 ft
4 main spans
Daily traffic
1,300
2014 count
Owner
State
State Highway Agency

About this bridge

N15-OLD HWY 58-N15 over Interstate 15 is a concrete continuous box beam or girders - multiple carrying N15-OLD HWY 58-N15 over Interstate 15 in San Bernardino County, California. It was built in 1961, so it is 64 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 1,300 vehicles a day, roughly 1% of them trucks, projected to reach 2,000 by 2044. The structure is 265 ft (80.8 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesN15-OLD HWY 58-N15
CrossesInterstate 15
Location08-SBD-015-76.80
RouteInterstate 15
CountySan Bernardino County
StateCalifornia
Coordinates34.90808, -116.97339
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span80 ft (24.4 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2014)
Projected traffic2,000 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

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 N15-OLD HWY 58-N15 over Interstate 15 built?

It was built in 1961, making it 64 years old in 2025.

What condition is N15-OLD HWY 58-N15 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 June 2024.

How much traffic does N15-OLD HWY 58-N15 over Interstate 15 carry?

About 1,300 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is N15-OLD HWY 58-N15 over Interstate 15?

The structure is 265 ft (80.8 m) long with a longest span of 80 ft (24.4 m) and a deck 34 ft wide.

Who owns N15-OLD HWY 58-N15 over Interstate 15?

It is owned by the State Highway Agency.