US Bridges

Merrill-Mill ST over UP RR

Poor

San Bernardino County, California · 2.4 MI W RTE I-215 · Structure no. 54C0343

Built
1967
58 years old
Condition
Poor
inspected November 2023
Type
Slab
Concrete Continuous
Length
122 ft
5 main spans
Daily traffic
11,141
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

Merrill-Mill ST over UP RR is a concrete continuous slab carrying Merrill-Mill ST over UP RR in San Bernardino County, California. It was built in 1967, so it is 58 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 11,141 vehicles a day, roughly 3% of them trucks, projected to reach 13,818 by 2045. The structure is 122 ft (37.2 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMerrill-Mill ST
CrossesUP RR
Location2.4 MI W RTE I-215
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.09222, -117.34375
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length122 ft (37.2 m)
Longest span30 ft (9.1 m)
Deck width64 ft (19.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,141 (2014)
Projected traffic13,818 by 2045
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.2 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Merrill-Mill ST over UP RR built?

It was built in 1967, making it 58 years old in 2025.

What condition is Merrill-Mill ST over UP RR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does Merrill-Mill ST over UP RR carry?

About 11,141 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is Merrill-Mill ST over UP RR?

The structure is 122 ft (37.2 m) long with a longest span of 30 ft (9.1 m) and a deck 64 ft wide.

Who owns Merrill-Mill ST over UP RR?

It is owned by the City or Municipal Highway Agency.