US Bridges

State Route 18 over BNSF RY UP AMTRAK Mojave

Fair

San Bernardino County, California · 08-SBD-018-95.35 · Structure no. 54 0307

Built
1962
63 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
447 ft
5 main spans
Daily traffic
45,000
2022 count
Owner
State
State Highway Agency

About this bridge

State Route 18 over BNSF RY UP AMTRAK Mojave is a steel stringer/multi-beam or girder carrying State Route 18 over BNSF RY UP AMTRAK Mojave in San Bernardino County, California. It was built in 1962, so it is 63 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 45,000 vehicles a day, roughly 12% of them trucks, projected to reach 60,000 by 2042. The structure is 447 ft (136.2 m) long and 74 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesState Route 18
CrossesBNSF RY UP AMTRAK Mojave
Location08-SBD-018-95.35
RouteState Highway 18
CountySan Bernardino County
StateCalifornia
Coordinates34.53389, -117.28679
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating86.8 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length447 ft (136.2 m)
Longest span100 ft (30.5 m)
Deck width74 ft (22.5 m)
Roadway width58 ft (17.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,000 (2022)
Projected traffic60,000 by 2042
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 18 over BNSF RY UP AMTRAK Mojave built?

It was built in 1962, making it 63 years old in 2025.

What condition is State Route 18 over BNSF RY UP AMTRAK Mojave 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 December 2024.

How much traffic does State Route 18 over BNSF RY UP AMTRAK Mojave carry?

About 45,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is State Route 18 over BNSF RY UP AMTRAK Mojave?

The structure is 447 ft (136.2 m) long with a longest span of 100 ft (30.5 m) and a deck 74 ft wide.

Who owns State Route 18 over BNSF RY UP AMTRAK Mojave?

It is owned by the State Highway Agency.