US Bridges

Amboy RD over 29 Palms Fl Cont Channel

Fair

San Bernardino County, California · 0.2 MI E of Utah Trail · Structure no. 54C0347

Built
1977
48 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
106 ft
4 main spans
Daily traffic
1,925
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Amboy RD over 29 Palms Fl Cont Channel is a concrete continuous slab carrying Amboy RD over 29 Palms Fl Cont Channel in San Bernardino County, California. It was built in 1977, so it is 48 years old, younger 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 1,925 vehicles a day, roughly 1% of them trucks, projected to reach 2,670 by 2040. The structure is 106 ft (32.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAmboy RD
Crosses29 Palms Fl Cont Channel
Location0.2 MI E of Utah Trail
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.16496, -116.03342
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span30 ft (9.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,925 (2021)
Projected traffic2,670 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Amboy RD over 29 Palms Fl Cont Channel built?

It was built in 1977, making it 48 years old in 2025.

What condition is Amboy RD over 29 Palms Fl Cont Channel 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 July 2023.

How much traffic does Amboy RD over 29 Palms Fl Cont Channel carry?

About 1,925 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Amboy RD over 29 Palms Fl Cont Channel?

The structure is 106 ft (32.3 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.

Who owns Amboy RD over 29 Palms Fl Cont Channel?

It is owned by the City or Municipal Highway Agency.