US Bridges

STC7221;CARSON ST over Portneuf River

Good

Bannock County, Idaho · In Pocatello;carson St. · Structure no. 000000000021376

Built
2023
2 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
4,600
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

STC7221;CARSON ST over Portneuf River is a prestressed concrete stringer/multi-beam or girder carrying STC7221;CARSON ST over Portneuf River in Bannock County, Idaho. It was built in 2023, so it is 2 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,600 vehicles a day, roughly 4% of them trucks, projected to reach 6,900 by 2042. The structure is 70 ft (21.3 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSTC7221;CARSON ST
CrossesPortneuf River
LocationIn Pocatello;carson St.
RouteCity Street 7221
CountyBannock County
StateIdaho
Coordinates42.86836, -112.46589
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating84.3 US tons
Inventory rating65 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span67 ft (20.4 m)
Deck width56 ft (17.1 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2023)
Projected traffic6,900 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC7221;CARSON ST over Portneuf River built?

It was built in 2023, making it 2 years old in 2025.

What condition is STC7221;CARSON ST over Portneuf River 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 July 2023.

How much traffic does STC7221;CARSON ST over Portneuf River carry?

About 4,600 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is STC7221;CARSON ST over Portneuf River?

The structure is 70 ft (21.3 m) long with a longest span of 67 ft (20.4 m) and a deck 56 ft wide.

Who owns STC7221;CARSON ST over Portneuf River?

It is owned by the City or Municipal Highway Agency.