US Bridges

Mountain Ave over UP RR AMTRAK Metrolink

Fair

San Bernardino County, California · 0.1 MI S Holt Blvd · Structure no. 54C0357

Built
1970
55 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
546 ft
7 main spans
Daily traffic
30,247
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mountain Ave over UP RR AMTRAK Metrolink is a concrete continuous box beam or girders - multiple carrying Mountain Ave over UP RR AMTRAK Metrolink in San Bernardino County, California. It was built in 1970, so it is 55 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 30,247 vehicles a day, roughly 6% of them trucks, projected to reach 48,837 by 2040. The structure is 546 ft (166.5 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMountain Ave
CrossesUP RR AMTRAK Metrolink
Location0.1 MI S Holt Blvd
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.05973, -117.66972
Functional classUrban Other Principal 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
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 inspectionApril 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating30.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length546 ft (166.5 m)
Longest span82 ft (25 m)
Deck width69 ft (21 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,247 (2015)
Projected traffic48,837 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Mountain Ave over UP RR AMTRAK Metrolink built?

It was built in 1970, making it 55 years old in 2025.

What condition is Mountain Ave over UP RR AMTRAK Metrolink 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 April 2023.

How much traffic does Mountain Ave over UP RR AMTRAK Metrolink carry?

About 30,247 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is Mountain Ave over UP RR AMTRAK Metrolink?

The structure is 546 ft (166.5 m) long with a longest span of 82 ft (25 m) and a deck 69 ft wide.

Who owns Mountain Ave over UP RR AMTRAK Metrolink?

It is owned by the City or Municipal Highway Agency.