US Bridges

Emerald Road over Deer Flat High Line Cnl

Fair

Canyon County, Idaho · 4.7 S. 3.0 W. Nampa · Structure no. 000000000026840

Built
1988
37 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
300
2023 count
Owner
Local
Other Local Agency

About this bridge

Emerald Road over Deer Flat High Line Cnl is a concrete frame carrying Emerald Road over Deer Flat High Line Cnl in Canyon County, Idaho. It was built in 1988, so it is 37 years old, younger than the Idaho average of 45.3 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 300 vehicles a day, roughly 10% of them trucks, projected to reach 450 by 2039. The structure is 22 ft (6.7 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesEmerald Road
CrossesDeer Flat High Line Cnl
Location4.7 S. 3.0 W. Nampa
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.51017, -116.62097
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width50 ft (15.3 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic450 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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 Emerald Road over Deer Flat High Line Cnl built?

It was built in 1988, making it 37 years old in 2025.

What condition is Emerald Road over Deer Flat High Line Cnl 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 March 2024.

How much traffic does Emerald Road over Deer Flat High Line Cnl carry?

About 300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Emerald Road over Deer Flat High Line Cnl?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 50 ft wide.

Who owns Emerald Road over Deer Flat High Line Cnl?

It is owned by the Other Local Agency.