US Bridges

Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic

Fair

Bingham County, Idaho · 15.5 N. Blackfoot · Structure no. 000000000019265

Built
1962
63 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
3 main spans
Daily traffic
1,900
2023 count
Owner
State
State Highway Agency

About this bridge

Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic is a prestressed concrete stringer/multi-beam or girder carrying Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic in Bingham County, Idaho. It was built in 1962, so it is 63 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 6 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 1,900 vehicles a day, roughly 19% of them trucks, projected to reach 2,850 by 2042. The structure is 220 ft (67.1 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesStc 1847;E 1250 N
CrossesI 15 Sb-Nb;s.Shelly Ic
Location15.5 N. Blackfoot
RouteCounty Highway 1847
CountyBingham County
StateIdaho
Coordinates43.38214, -112.18911
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span49 ft (14.9 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2023)
Projected traffic2,850 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.5 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic built?

It was built in 1962, making it 63 years old in 2025.

What condition is Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic 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 May 2023.

How much traffic does Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic carry?

About 1,900 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic?

The structure is 220 ft (67.1 m) long with a longest span of 49 ft (14.9 m) and a deck 33 ft wide.

Who owns Stc 1847;E 1250 N over I 15 Sb-Nb;s.Shelly Ic?

It is owned by the State Highway Agency.