US Bridges

STP8423;AMITY Ave over Uprr;amity Ave Op

Good

Canyon County, Idaho · In Nampa; Amity Ave · Structure no. 000000000021842

Built
2007
18 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
608 ft
4 main spans
Daily traffic
13,500
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

STP8423;AMITY Ave over Uprr;amity Ave Op is a steel continuous stringer/multi-beam or girder carrying STP8423;AMITY Ave over Uprr;amity Ave Op in Canyon County, Idaho. It was built in 2007, so it is 18 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,500 vehicles a day, roughly 2% of them trucks, projected to reach 20,250 by 2042. The structure is 608 ft (185.3 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSTP8423;AMITY Ave
CrossesUprr;amity Ave Op
LocationIn Nampa; Amity Ave
RouteCity Street 8423
CountyCanyon County
StateIdaho
Coordinates43.56142, -116.53319
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length608 ft (185.3 m)
Longest span245 ft (74.7 m)
Deck width66 ft (20 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2023)
Projected traffic20,250 by 2042
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was STP8423;AMITY Ave over Uprr;amity Ave Op built?

It was built in 2007, making it 18 years old in 2025.

What condition is STP8423;AMITY Ave over Uprr;amity Ave Op in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does STP8423;AMITY Ave over Uprr;amity Ave Op carry?

About 13,500 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is STP8423;AMITY Ave over Uprr;amity Ave Op?

The structure is 608 ft (185.3 m) long with a longest span of 245 ft (74.7 m) and a deck 66 ft wide.

Who owns STP8423;AMITY Ave over Uprr;amity Ave Op?

It is owned by the City or Municipal Highway Agency.