US Bridges

US 20 over Uprr;new York Canal

Fair

Ada County, Idaho · 1 S. Boise;broadway Ave · Structure no. 000000000012285

Built
1970
55 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
302 ft
3 main spans
Daily traffic
35,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over Uprr;new York Canal is a steel continuous stringer/multi-beam or girder carrying US 20 over Uprr;new York Canal in Ada County, Idaho. It was built in 1970, so it is 55 years old, older 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 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 35,500 vehicles a day, roughly 4% of them trucks, projected to reach 53,250 by 2042. The structure is 302 ft (92 m) long and 84 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesUS 20
CrossesUprr;new York Canal
Location1 S. Boise;broadway Ave
RouteU.S. Route 20
StateIdaho
Coordinates43.56822, -116.19553
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
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 rating54 US tons
Inventory rating32 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length302 ft (92 m)
Longest span138 ft (42.1 m)
Deck width84 ft (25.5 m)
Roadway width81 ft (24.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,500 (2023)
Projected traffic53,250 by 2042
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed5 mi (8 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 US 20 over Uprr;new York Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is US 20 over Uprr;new York Canal 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 February 2024.

How much traffic does US 20 over Uprr;new York Canal carry?

About 35,500 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 20 over Uprr;new York Canal?

The structure is 302 ft (92 m) long with a longest span of 138 ft (42.1 m) and a deck 84 ft wide.

Who owns US 20 over Uprr;new York Canal?

It is owned by the State Highway Agency.