US Bridges

STC8223;NORTHSIDE over Uprr;nampa RR Overpass

Fair

Canyon County, Idaho · In Nampa · Structure no. 000000000014730

Built
1968
57 years old, rebuilt 2009
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
430 ft
5 main spans
Daily traffic
29,000
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

STC8223;NORTHSIDE over Uprr;nampa RR Overpass is a steel stringer/multi-beam or girder carrying STC8223;NORTHSIDE over Uprr;nampa RR Overpass in Canyon County, Idaho. It was built in 1968 and reconstructed in 2009, so it is 57 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 29,000 vehicles a day, roughly 3% of them trucks, projected to reach 43,500 by 2042. The structure is 430 ft (131.1 m) long and 74 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC8223;NORTHSIDE
CrossesUprr;nampa RR Overpass
LocationIn Nampa
RouteCity Street 8223
CountyCanyon County
StateIdaho
Coordinates43.58831, -116.57231
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length430 ft (131.1 m)
Longest span116 ft (35.4 m)
Deck width74 ft (22.7 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,000 (2023)
Projected traffic43,500 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$7.1 million (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was STC8223;NORTHSIDE over Uprr;nampa RR Overpass built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2009.

What condition is STC8223;NORTHSIDE over Uprr;nampa RR Overpass 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 September 2023.

How much traffic does STC8223;NORTHSIDE over Uprr;nampa RR Overpass carry?

About 29,000 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is STC8223;NORTHSIDE over Uprr;nampa RR Overpass?

The structure is 430 ft (131.1 m) long with a longest span of 116 ft (35.4 m) and a deck 74 ft wide.

Who owns STC8223;NORTHSIDE over Uprr;nampa RR Overpass?

It is owned by the City or Municipal Highway Agency.