US Bridges

Lewis Street over Portneuf River

Good

Bannock County, Idaho · In Pocatello; Lewis ST · Structure no. 000000000022186

Built
2017
8 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
2,500
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lewis Street over Portneuf River is a prestressed concrete stringer/multi-beam or girder carrying Lewis Street over Portneuf River in Bannock County, Idaho. It was built in 2017, so it is 8 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 2,500 vehicles a day, roughly 10% of them trucks, projected to reach 3,750 by 2039. The structure is 77 ft (23.5 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesLewis Street
CrossesPortneuf River
LocationIn Pocatello; Lewis ST
RouteCity Street 0
StateIdaho
Coordinates42.85875, -112.45392
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating48.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length77 ft (23.5 m)
Longest span74 ft (22.6 m)
Deck width39 ft (12 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2023)
Projected traffic3,750 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 Lewis Street over Portneuf River built?

It was built in 2017, making it 8 years old in 2025.

What condition is Lewis Street 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 April 2023.

How much traffic does Lewis Street over Portneuf River carry?

About 2,500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Lewis Street over Portneuf River?

The structure is 77 ft (23.5 m) long with a longest span of 74 ft (22.6 m) and a deck 39 ft wide.

Who owns Lewis Street over Portneuf River?

It is owned by the City or Municipal Highway Agency.