US Bridges

N 1st Avenue over Mojave River

Fair

San Bernardino County, California · 1.4 MI N/O RTE 15 · Structure no. 54C0089

Built
1933
92 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
747 ft
5 main spans
Daily traffic
12,000
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

N 1st Avenue over Mojave River is a steel stringer/multi-beam or girder carrying N 1st Avenue over Mojave River in San Bernardino County, California. It was built in 1933, so it is 92 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 6 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 12,000 vehicles a day, roughly 3% of them trucks, projected to reach 15,612 by 2044. The structure is 747 ft (227.7 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesN 1st Avenue
CrossesMojave River
Location1.4 MI N/O RTE 15
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.90531, -117.02359
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.8 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5 (+7 approach)
Design loadH 15
Structure length747 ft (227.7 m)
Longest span100 ft (30.5 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2016)
Projected traffic15,612 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N 1st Avenue over Mojave River built?

It was built in 1933, making it 92 years old in 2025.

What condition is N 1st Avenue over Mojave River 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 November 2024.

How much traffic does N 1st Avenue over Mojave River carry?

About 12,000 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is N 1st Avenue over Mojave River?

The structure is 747 ft (227.7 m) long with a longest span of 100 ft (30.5 m) and a deck 30 ft wide.

Who owns N 1st Avenue over Mojave River?

It is owned by the City or Municipal Highway Agency.