US Bridges

State Route 86 NB over Ambig Ditch

Fair

Imperial County, California · 11-IMP-086-64.75 · Structure no. 58 0070R

Built
1981
44 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
59 ft
2 main spans
Daily traffic
7,200
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 86 NB over Ambig Ditch is a concrete continuous slab carrying State Route 86 NB over Ambig Ditch in Imperial County, California. It was built in 1981, so it is 44 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 7,200 vehicles a day, roughly 25% of them trucks, projected to reach 13,726 by 2041. The structure is 59 ft (18 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesState Route 86 NB
CrossesAmbig Ditch
Location11-IMP-086-64.75
RouteState Highway 86
CountyImperial County
StateCalifornia
Coordinates33.38704, -116.03766
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length59 ft (18 m)
Longest span28 ft (8.5 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,200 (2016)
Projected traffic13,726 by 2041
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 86 NB over Ambig Ditch built?

It was built in 1981, making it 44 years old in 2025.

What condition is State Route 86 NB over Ambig Ditch 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 2023.

How much traffic does State Route 86 NB over Ambig Ditch carry?

About 7,200 vehicles per day (2016 count), of which roughly 25% are trucks.

How long is State Route 86 NB over Ambig Ditch?

The structure is 59 ft (18 m) long with a longest span of 28 ft (8.5 m) and a deck 43 ft wide.

Who owns State Route 86 NB over Ambig Ditch?

It is owned by the State Highway Agency.